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An annotated index of 325 cyclotron and accelerator documents — build reports, theses, lab manuals, datasheets, and classic papers — each scored on two axes: relevance (0–5, usefulness to someone designing or building a small cyclotron) and hands-on (0–5, concrete engineering content versus pure theory). Older hands-on literature from the 1940s–70s deliberately scores high: it documents machines at amateur scale, built with techniques an individual can reproduce.

The documents are grouped below into four classes by era and kind; the search box and topic chips filter across all of them, and a class that has no match collapses to a note. This is a bibliography first. Where a document is legitimately available online, its entry carries an outbound link (DOI, OSTI, arXiv, publisher, or open archive); the public-domain construction reports in the Construction Classics collection are hosted on this site and marked “hosted”. For the rest, obtain documents through libraries, publishers, or an inter-library loan request. Download this bibliography as BibTeX.

325 documents, sorted by relevance to small-machine builders.

Classic hands-on 80

Construction-era reports, 1930s–1970s: AEC laboratory documents and the papers around them that record how real machines were designed, fabricated, and commissioned, at a scale and with techniques an individual can reproduce. This is why the oldest literature scores highest for relevance.

  1. General Recommendations for Design of Small Cyclotrons (UCRL-476)

    Louis Wouters, University of California Radiation Laboratory / US AEC · 1949 classic hands-on relevance 5 · hands-on 5 hosted

    A 1949 UCRL cookbook for designing and building small cyclotrons, using a working 6-inch machine as the worked example. Covers magnet design (iron saturation, leakage flux, ampere-turn calculation, coil winding and cooling), tank and single-dee construction, hydrogen ion source (tungsten filament arc, palladium leak valve), a grounded-grid Hartley oscillator, bake-out and first-beam operating procedure, and safety precautions, with schematic drawings and a magnet design sheet appended.

    magnetcoilsrfdeeion-sourcevacuumchambersafetyfabricationcyclotron-general

  2. Particle Accelerators

    M. Stanley Livingston and John P. Blewett · 1962 classic hands-on relevance 5 · hands-on 5

    The canonical accelerator engineering text, written from the authors' first-hand experience building the machines. Chapter-per-machine treatment (electrostatic generators, cyclotron, betatron, synchrotrons, linacs) plus cross-cutting engineering chapters on ion sources, particle motion, and magnet design and measurement. The cyclotron chapter alone is a complete design manual for a classical fixed-frequency machine.

    cyclotron-generalmagnetrfion-sourcedeevacuumbeam-dynamicstargetsshieldingaccelerator-other

  3. The Oak Ridge 86-Inch Cyclotron (ORNL-1196)

    Robert S. Livingston and Alfred L. Boch, Oak Ridge National Laboratory · 1952 classic hands-on relevance 5 · hands-on 5 hosted

    Full design/construction/commissioning report for ORNL's 86-inch fixed-frequency proton cyclotron, which delivered over 1 mA internal proton beam at 23 MeV within two years of the 1949 start. Covers the vertically suspended dees in a horizontal field, high dee voltage RF system, ion-loading control in the resonant system, oscillator plate supplies, and target development, with copious construction photos and drawings.

    cyclotron-generalmagnetrfdeeion-sourcevacuumtargetsfabrication

  4. The Iowa State University 1.5 MeV Undergraduate Cyclotron

    Daniel J. McGuire, Iowa State University (Proc. Iowa Academy of Science 68) · 1961 classic hands-on relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Description of the first operating small cyclotron built by an undergraduate group (begun 1954, first beam spring 1957) capable of useful nuclear reactions. Gives machine specifications, a short review of cyclotron action, and describes the auxiliary laboratory equipment; notes donated industrial materials and its ongoing use as an instructional device.

    cyclotron-generalmagnetrfvacuumion-sourcebeam-measurement

  5. The Argonne 60-Inch Cyclotron (ANL-5907)

    W. J. Ramler and G. W. Parker, Argonne National Laboratory · 1959 classic hands-on relevance 4 · hands-on 5 hosted

    System-by-system engineering description of ANL's constant-frequency 60-inch cyclotron (21 MeV / 200+ uA deflected deuterons, operating since 1952): cooling plant, vacuum system, magnet, RF/dee system, ion source, deflector, and building facilities, plus the acceptance specs and commissioning history. Classic AEC-era report writing where every subsystem gets real numbers.

    cyclotron-generalmagnetrfdeevacuumion-sourcefabricationbeam-measurement

  6. The Farnsworth/Hirsch Fusor: How a Small Vacuum System and a Bit of Basketweaving Will Get You a Working Inertial-Electrostatic Confinement Neutron Source

    Richard Hull (Tesla Coil Builders of Richmond), in The Bell Jar Vol.6 No.3/4 · 1997 classic hands-on relevance 4 · hands-on 5 publisher ↗ archived Dec 2025

    The classic amateur fusor build article from The Bell Jar. Covers history and operating principles, then gives complete construction guidance: grid winding, chamber layout, gas handling, a neon-sign-transformer HV supply schematic with metering, electron-emitter biasing for low-pressure deuterium ionization, and hard-won practical cautions. Claims a demonstrator for under $50 and a neutron-producing machine for ~$400 plus a high-vacuum system.

    iec-fusorfusionvacuumion-sourcesafetyfabricationdetectors

  7. Experiments on the Transmutation of Elements by Protons

    M. L. E. Oliphant and Lord Rutherford, Cavendish Laboratory · 1933 classic hands-on relevance 4 · hands-on 4 DOI ↗ archived Aug 2026

    Classic Cavendish paper describing a purpose-built discharge tube delivering ~100 microamp analysed proton beams at up to 250 kV, used to study disintegration of lithium and boron at proton energies as low as 20-200 keV. Details the discharge tube design, magnetic analysis of H+ vs H2+, thin-film targets, and range/energy measurements of the emitted alpha particles.

    ion-sourcetargetsboron-11vacuumdetectorsaccelerator-other

  8. Fusor: An Easy to Construct Fusion Reactor Based on Inertial Electrostatic Confinement

    Richard Hull (amateur scientist, fusor.net) · 2009 classic hands-on relevance 4 · hands-on 4

    Slide deck by Richard Hull, dean of the amateur fusor community, covering his path as an amateur scientist and the practicalities of building a demo/neutron-producing fusor: fuel choice (why D-D for amateurs vs D-T and D-3He), grid and chamber construction, operating modes, and amateur vs academic efforts. Strongly build-oriented in outlook, though a slide deck rather than a manual.

    iec-fusorfusionvacuumion-sourcedetectorssafetyfabrication

  9. Radio Frequency Performance of Electroplated Finishes

    A.M. Fowler (Australian Post Office Research Laboratories), Proc. I.R.E.E. Australia, May 1970 · 1970 classic hands-on relevance 4 · hands-on 4

    Classic measurement-driven paper showing that silver-plating a copper RF conductor usually INCREASES loss: electroplated metal conductivity is well below wrought metal, bi-metallic skin-effect current distribution penalizes half-conductivity coatings, and thick protective layers make it worse. Recommends plating high-conductivity copper first, then only a very thin low-conductivity tarnish-protection layer, with families of design curves for composite conductors.

    rfmaterialsfabricationdee

  10. The Oak Ridge Relativistic Isochronous Cyclotron (ORNL-2648)

    Compiled and edited by R. S. Livingston and F. T. Howard, ORNL (contributors incl. B. L. Cohen, H. G. Blosser, M. M. Gordon, T. A. Welton) · 1958 classic hands-on relevance 4 · hands-on 4 hosted

    The ORIC proposal/design report, summarizing ORNL's development work toward a variable-energy sector-focused isochronous cyclotron. Sections by the founding names of AVF cyclotron design (Blosser, Cohen, Gordon, Welton) cover magnetic field design with model-magnet measurement runs, radial stability, beam deflection/extraction, the RF system, and supporting engineering studies.

    cyclotron-generalmagnetrfbeam-dynamicsfabrication

  11. Tips for Inertial Electrostatic Confinement Fusion Investigators (Supplement to 'The World's Simplest Fusion Reactor')

    Tom Ligon · 1998 classic hands-on relevance 4 · hands-on 4

    Practical supplement to Ligon's Analog article: a working-lab checklist for amateur fusor builders. Covers lethal-HV safety practice, vacuum equipment and pressurized flammable gas (deuterium) handling, fast-neutron hazards and the need for health-physics supervision, neutron detection/quantification, and shop-practice advice, framed as get-an-advisor mentoring.

    iec-fusorsafetyvacuumion-sourcedetectorsfusionmaterials

  12. Astatic Model PDC-2 SWR Power Meter - 3-Function Test Instrument

    Astatic classic hands-on relevance 3 · hands-on 4

    Two-page instruction sheet for a compact 52-ohm SWR / relative RF power / field-strength meter (0-10 W and 0-100 W scales, usable below 148 MHz), with step-by-step SWR and power measurement procedures.

    rfmatchingbeam-measurement

  13. Magnetic Measurements on the LASL Prototype Magnet

    W. Dunwoody, J. Spencer, N. Tanaka et al., Los Alamos Scientific Laboratory · 1971 classic hands-on relevance 3 · hands-on 4

    Reports design and field mapping of a small prototype dipole for the LAMPF HRS and EPICS spectrometers. Instead of pole-face shims, corrective current elements (Ht-windings) embedded in the pole pieces dynamically trim field inhomogeneity, improving median-plane uniformity from a few parts in 1e3 to a few parts in 1e5 over 4-17 kG.

    magnetcoilsbeam-measurementfabrication

  14. The World's Simplest Fusion Reactor, And How to Make It Work

    Tom Ligon (Analog Science Fiction and Fact, Dec. 1998; 2007 revision) · 1998 classic hands-on relevance 3 · hands-on 3

    Ligon's famous popular-science article (written while working in Bussard's lab) that launched the amateur fusor movement. Explains fusion basics, the failings of tokamak-scale approaches, IEC/IXL/EXL concepts, and how a demonstration fusor operating at 10-15 kV can be built at high-school level. Broad-audience exposition with practical framing rather than a step-by-step plan (that role is filled by the companion FUSORTIP document).

    iec-fusorfusionvacuumsafetyion-source

  15. Neutrons and Gamma Rays from the Alpha-Particle Bombardment of Be9, B10, B11, C13, and O18

    T. W. Bonner, A. A. Kraus Jr., J. B. Marion, J. P. Schiffer (Rice Institute) · 1956 classic hands-on relevance 2 · hands-on 3

    Physical Review 102, 1348 (1956). Excitation curves for neutrons and gamma rays from alpha bombardment (1.8-5.3 MeV, Van de Graaff) of thin Be-9, B-10, B-11, C-13, and O-18 targets, tabulating resonance energies, widths, and cross sections. Experimental sections detail the modified long counter, NaI gamma detection, target preparation issues (carbon buildup), and energy calibration via Li-7 thresholds.

    targetsdetectorsboron-11physics-theoryshielding

  16. Design and Construction of Synchro-Cyclotron: Final Report on Joint ONR-AEC Project (NYO-780)

    E. Creutz, Carnegie Institute of Technology / US AEC-ONR · 1950 classic hands-on relevance 5 · hands-on 5 hosted

    Complete-machine construction report on the Carnegie Tech 435-MeV synchrocyclotron: 1500-ton magnet developed through 2", 6", 9" and 8.667" model-magnet studies (coil-height cost optimization, pole taper/shim development to n=0.2, +/-0.0025" pole machining); oil-cooled 130-ton coil with fishpaper/pressboard/formica insulation wound at Brooklyn Navy Shipyard; welded-aluminum split vacuum chamber reaching 3e-6 mm Hg with helium leak-tested pump lines and automatic air-operated vacuum valves; four-880-tube oscillator debugged on 3/4-scale then full-scale models (parasitic-mode suppression with lamp loads, biased dee on insulator columns); rotary condenser, magnetite-concrete shielding with interlocked 80-ton doors, and the full oil/water/cooling-tower plant. Ends with a dense tabulated summary of every design parameter.

    magnetcoilsvacuumrfdeefabricationsafetycyclotron-general

  17. Design of the Radio-Frequency System for the 184-inch Cyclotron (UCRL-64)

    K. R. MacKenzie, F. H. Schmidt, J. R. Woodyard, and L. F. Wouters, UC Radiation Laboratory / US AEC · 1948 classic hands-on relevance 4 · hands-on 5 hosted

    Design history of the Berkeley 184-inch FM RF system: single dee + rotary condenser joined by a four-line low-impedance (~10 ohm) transmission line running in the half-wave mode, driven by a 9C21 grounded-grid oscillator coupled by loops near the voltage node (20 kW to the dee, 20 kV, 60% efficient, 12.5-9.0 Mc). Covers dee gap sizing for 50 kV, feedthrough insulator qualification on a high-Q quarter-wave test resonator ("Pandora"), vacuum RF breakdown data (0.080" copper gap holds 50 kV at 13 Mc), quarter-scale modeling of the whole resonant system, copper-plating and foam-backed copper-strip RF joints, oscillator magnetic shielding, and operating experience: pole-to-pole cavity mode killed by strapping, multipactor/resonant-electron discharges killed by volume reduction, dummy dee and negative dee bias.

    rfdeevacuumfabricationmaterials

  18. R.F. System for Frequency Modulated Cyclotron (MDDC-1045)

    K. R. MacKenzie and V. B. Waithman, UC Radiation Laboratory / US AEC · 1946 classic hands-on relevance 5 · hands-on 5 hosted

    The first synchrocyclotron RF system (Berkeley 37-inch, the machine that proved the principle): grounded-grid oscillators (4x304TL, then 889, then 3X2500A3) loop-coupled to a dee + rotary-condenser half-wave line. Concise, quantitative treatment of coupling loop design, grid-grounding ring capacitor construction (0.010" polystyrene), grid-blocking RC criterion, filament-loop phase correction (~220 pF series capacitor cancels ~21 deg), plate-loop-vs-harmonic amplitude modulation, a ~6% tuning vane, copper-plating experience at 10 vs 20 Mc, and the classic description of the low-voltage electron-oscillation (multipactor-type) discharge quenched by DC sweeping bias or a tickler oscillator.

    rfdeevacuumsafety

  19. The 184-inch Commissioning Papers, 1946-47 (MDDC-964, -982, -984, -987, -1051, -1092)

    R. L. Anderson, A. Reyenga, D. C. Sewell, J. Vale, F. W. Yeater, L. Henrich et al., UC Radiation Laboratory / US AEC · 1947 classic hands-on relevance 4 · hands-on 5 hosted

    Six declassified memoranda from the 184-inch synchrocyclotron’s first year: the beam loss at 82 inches traced to the n = 0.2 coupling resonance, where radial oscillation converts to vertical at up to double the amplitude (found by slotted-target radioautography, confirmed by dee-lip activation, and worst for low-dee-voltage many-turn machines); synchroscope fine-structure identified quantitatively as orbit-center precession and confirmed with a two-probe experiment; a failed 60 kV vertical DC deflector trial with its warped septum foil; probe-head activation mapping with a collimated counter; and oscillator capacitance measurements by bridge. Raw commissioning logs, failures included.

    beam-measurementbeam-dynamicsextractionrfsafetycyclotron-generaldetectorsmagnetsealsmaterialschamber

  20. Cyclotrons and High-Energy Accelerators - 1958 (ORNL-2644)

    F. T. Howard, Oak Ridge National Laboratory / US AEC · 1958 classic hands-on relevance 5 · hands-on 3 hosted

    Questionnaire-based census of 140 accelerators worldwide (108 with verified data): 76 fixed-frequency cyclotrons, 18 synchrocyclotrons, plus synchrotrons and linacs. Each machine gets a standardized two-page data sheet (form X-882): pole diameter, gap, field, drop-off, iron/copper weight, winding, dee geometry, oscillator type/tube/power, dee voltage, ion source, extraction type, shielding, cost, schedule, plus measured performance (energy, frequency, field, dee kV, internal and external beam) and an "unusual features" box that is often the most valuable part. The population of small classical cyclotrons (16-37 in) defines the empirical design envelope: 12.5-18.5 kG fields, 2-4% field drop-off, 18-90 kV dee-to-dee, 10-50 kW oscillators, hooded-arc sources, 100 uA - 3 mA internal beams.

    cyclotron-generalmagnetrfdeeion-sourcebeam-measurementfabrication

  21. A Cyclotron Power-Amplifier RF System Using a 4CW50,000C/8350 Tetrode

    Jon W. Osterlund and Rodman Smythe (University of Colorado) · 1965 classic hands-on relevance 4 · hands-on 5 hosted

    Operating report on the rebuilt RF system of the Colorado 52-inch cyclotron after replacing a glass triode with a ceramic-metal 8350/4CW50,000C tetrode (installed May 1964): master oscillator -> multipliers -> 8168 driver -> 8350 PA capacitively coupled (15 pF in the magnet gap) to a single 80 kV dee on a coaxial movable-short resonator, 7.5-21.3 Mc/s. Centerpiece is the dee-voltage control: a shunt-tube modulator whose input is a linear "or" gate of the dee voltmeter and two cathode-current-limiting amplifiers, so mistuning by an inexperienced operator cannot damage the power tubes; the same gate input pulses the beam for short half-life experiments. A transistor flip-flop phase detector (grid vs plate of the 8350) drives a trimmer-capacitor frequency servo that is interlocked to engage only above 20 kV dee voltage. Frank reliability notes: vacuum capacitors failed in the plate circuit; the Eimac-grid-collet movable-short contact ran flawlessly for three years at 110 A/in rms; downtime fell 6.8% -> 4.4% -> 0.6% over the first 1500 h. Cover pages degraded; body from the Summary (PDF 1) onward is sound.

    rfdeematchingfabrication

  22. A Square-Wave Cyclotron Oscillator

    C. D. Goodman (Oak Ridge National Laboratory, Electronuclear Research Division) · 1957 classic hands-on relevance 3 · hands-on 3 hosted

    Analysis and bench demonstration of replacing the sine dee voltage with an approximate square wave (fundamental + 1/3-amplitude third harmonic) in a high-Q resonant system. Motivations: less beam loss from electric defocusing (the residual axial electric force even becomes focusing early in the phase excursion), higher average-to-peak voltage during phase excursions hence fewer turns, better ion-source extraction (closer to steady-state plasma), and in AVF machines looser average-field tolerance. Appendices show third-harmonic addition does not spoil central ion bunching and derive the orbit-center displacement Delta-r = 2D sin(theta). The resonator synthesis treats the dee as a capacitor terminated by two shorted transmission lines whose lengths satisfy cot(a1*w) + b*cot(a2*w) - ac*w = 0 with w=1 and w=3 as simultaneous roots; a GR-874 coax bench model hit calculated lengths within ~2% and produced clean synthesized square waves, with a written iterative tuning procedure and a MOPA (oscillator + frequency tripler) drive scheme. PDF 33-60 are IBM-650 parameter tables. OCR trap: theta prints as (c) in the appendix equations.

    rfdeebeam-dynamicsion-sourcephysics-theory

  23. A Three-Phase Radiofrequency System for Cloverleaf Cyclotrons

    Bob H. Smith (UC Radiation Laboratory, Berkeley) · 1955 classic hands-on relevance 3 · hands-on 4 hosted

    Companion RF paper of the Berkeley cloverleaf (Thomas AVF) programme: three dees driven with three-phase RF on three machines (two electron models and the 20-inch proton machine; 3 kW and 37 kW systems). Covers the crystal-oscillator-driven phase generator built on the property that a 45-degree transmission line's input-impedance magnitude is independent of load resistance (servo-driven 250-ohm pot shifts phase without amplitude change); the servo chain of diode frequency converter (IF amplitude fixed by the LO so loop gain is independent of dee level, plus an antinoise circuit against arc/vibration noise) and a phase detector nulling at 120 degrees with 0.76 V per degree sensitivity; quantitative servo-performance targets; and the central lesson that unbalanced dee-to-dee capacitance couples the servo loops into instability until neutralized by dee-stem-to-dee-stem transmission lines (neutralizing coefficients below 3%, adjusted with the machine at air to avoid multipactoring). Once neutralized the machine behaves as three independent single-phase RF systems.

    rfdeematchingcyclotron-general

  24. Studies with a Three-Dee Three-Phase Proton Cyclotron

    Myron Heusinkveld, Mark Jakobson, Lawrence Ruby, Bob H. Smith, and Byron T. Wright (UCLA / UC Radiation Laboratory) · 1955 classic hands-on relevance 4 · hands-on 5 hosted

    Machine-side report of the 20-inch three-dee three-phase proton cyclotron built to study ion starting and three-phase RF (same cloverleaf programme as ucrl-3153). One frequency/field setting accelerates protons, deuterons, or tritons on the forward/ reverse/neutral modes. RF lessons: peak amplifier efficiency did not correspond to 120-degree dee phasing, so separate phase servos (on dees) and efficiency servos (via grid phase) were both needed, and individual dee control was impossible until interdee capacitance was neutralized; the A2505 finals were protected by interlocked air cooling, spark gaps on the half-wave lines, an rf-dc fault circuit with automatic recycler, and servo-deactivation during recycling; thermal detuning after shutdown caused ion lock, cured by grid-dip retuning. Ion-source lessons: moving from a central open arc to an off-center hooded-arc source (~1.75-inch radius, 1/8 x 3/4-inch slot, azimuthal injection into a dee) roughly doubled the internal proton beam from 3.2 mA to 6-7 mA at 8 inches (1.0 MeV) and eliminated dee-tip heating. Probe readings were cross-checked calorimetrically (90% agreement at 1-2 mA, 75% at 6-8 mA) and with a 450-V positive bias test. NOTE these are milliamperes of internal beam from a high-intensity programme - three orders beyond small-machine microampere practice.

    rfion-sourcebeam-measurementdeecyclotron-general

  25. Electrical Design of Electrostatic Deflectors for Sector-Focused Cyclotrons

    Bob H. Smith and Hermann A. Grunder (Lawrence Radiation Laboratory) · 1963 classic hands-on relevance 5 · hands-on 5 hosted

    THE practical electrostatic-deflector electrode design report. Reviews the 1952-53 LRL vacuum-sparking program (Heard, Chupp, Lauer et al.): the VE relationship (gap voltage x cathode gradient = constant for equal spark probability, verified 0.2 mm to 8.5 cm), measured spark-damage ranking of ~22 electrode materials with and without magnetic field, dark-current anode-transport and diffusion-pump-oil effects, and spark-energy/capacitance dependence of bake-in voltage. Then documents the 88-Inch test-model deflector: electromechanical (tuning-fork/Colpitts) oscillation of the cantilevered electrode and its cure, crowbar-controlled spark-current bake-in, tungsten spark anodes (+17% VE), capacitance independence 67-580 pF, magnetic-field independence, carbon vs metal septum beam tests, ion scrubbing, and a recommended design derating (1.5e4 vs 2.25e4 (kV)^2/cm achieved). Ends with a proposed three-element deflector layout with insulated ground electrodes for beam-based alignment.

    extractionmaterialsfabricationbeam-dynamicscyclotron-general

  26. Deflector Power Supply for Sector-Focused Cyclotrons

    Bob H. Smith (Lawrence Radiation Laboratory) · 1963 classic hands-on relevance 5 · hands-on 5 hosted

    The power supply behind the UCRL-10654 deflector: design philosophy is to LIMIT the energy delivered per spark (2.5 J stored at 120 kV) and give the operator control of spark current, rather than try to prevent sparks. Six-stage Cockcroft-Walton at 100 kc built from 1200 cheap Unitrode UT71 silicon diodes (600 piv, 0.75 A) on printed-circuit boards, each shunted by 250 pF/500 V ceramics for inverse-voltage grading, with 900 pF 30 kV TV-type ceramic capacitors between decks; driven by a 4CW2000 Colpitts oscillator whose screen grid is crowbarred by a 3D22 thyratron within microseconds of a spark. Delivers 120 kV at 5 mA regulated to 0.01% via a two-loop regulator, Zener reference, and forced-air metal-film precision divider. Appendix gives the practical CW output-voltage and ripple formulas and an RC filter design using the deflector capacitance itself.

    extractionrffabricationsafety

  27. High Voltage Pulser for 184-Inch Cyclotron Electric Deflector

    Q. A. Kerns, W. R. Baker, R. F. Edwards, and G. M. Farly (UC Radiation Laboratory) · 1948 classic hands-on relevance 3 · hands-on 5 hosted

    Declassified 1948 engineering report on the pulsed electrostatic deflector supply for the 184-inch synchrocyclotron. Works the requirements chain from beam physics to hardware: ~0.1 in radius gain per rf cycle vs 1-in deflector-bar spacing sets the pulse window (+/-5 rf cycles) and a 0.1 us 10-90% rise time; 75,000 V/cm (~200 kV across the bars) shifts the orbit center into the magnetic channel. Hardware: two 100-kV water-cooled Hipersil-core pulse transformers (2:17 turns, oil-filled lucite cases, tested to 300 kV), GE pulse capacitors discharged by 16 paralleled Kuthe 5C22 hydrogen thyratrons (5000 A at 11 kV each bank, jitter <0.01 us), DC resonance charging with a 4:1 step-up from capacitor voltage reversal. Honest performance data: 0.15 us achieved rise (50% over target, blamed on capacitor internal inductance), capacitor failures every 10-20 hours. Typewriter-era scan - OCR is poor; numbers here were verified on page images.

    extractionrffabricationaccelerator-other

  28. Extraction of Synchrocyclotron Beams Near the Maximum Energy

    Warren Fenton Stubbins (UC Radiation Laboratory) · 1956 classic hands-on relevance 2 · hands-on 3 hosted

    Peeler-regenerator (regenerator-only) extraction theory extended into the NONLINEAR falling field near a synchrocyclotron pole edge, worked for the 184-inch. States the three extraction requirements (arrest precession, get enough radial gain per turn, limit axial blowup), then gives a seven-step design procedure: nonlinear equations of motion, amplitude-dependent oscillation frequencies (Krylov-Bogoliubov), a piecewise matrix model of the orbit with the regenerator as a momentum impulse, conversion of the required impulse to a regenerator field-times-angle (B-theta, gauss-radians), the resulting axial kick, and selection of regenerator azimuth/radius. Worked example at R=79.8 in, B0=21,730 G, n=0.155 gives regenerator strengths 5.6-25.6 kG-deg for 0.5-2.5 in of radial displacement. Includes the channel's own uncorrected fringe field as a fourth region to be compensated by the regenerator rather than shimmed away.

    extractionbeam-dynamicsmagnetphysics-theory

  29. Radiofrequency System for Extracting Particles from a Cyclotron

    Warren Fenton Stubbins (Lawrence Radiation Laboratory) · 1958 classic hands-on relevance 3 · hands-on 2 hosted

    Proposes RF-driven resonant extraction: a separate tunable oscillator applies a radial electric field with a LINEAR gradient (F proportional to displacement) over 60 degrees of azimuth outside a reference orbit, at a frequency chosen to make the Hill-type radial equation absolutely unstable (omega = 2*omega0*sqrt(1-n)/l; l=1 preferred for least frequency sensitivity). Inspired by the observed vertical beat-frequency (VBF) beam destruction in the 184-inch. IBM 650 median-plane orbit runs for 50-MeV deuterons at 17 kG, n=0.1, using only 4.3 kV/cm of rf gradient, show good turn separation and phase-locking of oscillation maxima near one azimuth; precession eventually feeds every particle into the perturbation. Key argument: a tunable electrical perturbation suits variable-energy machines where fixed magnetic peelers/regenerators cannot follow the operating point.

    extractionbeam-dynamicsrfphysics-theory

  30. Electromagnetic Research Division Quarterly Progress Report, Part I, for Period Ending March 31, 1952

    F. T. Howard (ed.), Electromagnetic Research Division, ORNL (R. S. Livingston, Director) · 1952 classic hands-on relevance 5 · hands-on 5 hosted

    ORNL quarterly covering three working cyclotrons in different life stages: the 86-inch (production machine, mid-upgrade), the 63-inch (heavy-ion machine in RF commissioning), and the 22-inch (beam-physics testbed). The 86-inch ion source was moved 1.5 in upward (to 1 in below magnetic center), raising proton energy from ~19 to ~24 MeV at 1 mA; instrumentation upgrades include an in-line electric boiler for calibrating target-water calorimetry and a vacuum-tube dee-voltage rectifier replacing neutron-damaged germanium diodes. The 63-inch held 75 kV dee-to-dee under vacuum for long periods against a 60 kV design spec, with field remeasured under vacuum (distortion negligible, first harmonic ~0.03%). The 22-inch section maps z-wise proton beam distribution with a five-segment probe (nearly all loss inside half of maximum radius), studies H1+/H3+ beam composition via magnetic resonance curves, and quantifies arc-slit length and dee-bias effects on accelerated beam.

    cyclotron-generalbeam-measuremention-sourcerfdeevacuummagnetsafety

  31. Electromagnetic Research Division Quarterly Progress Report, Part I, for Period Ending June 30, 1952

    F. T. Howard (ed.), Electromagnetic Research Division, ORNL (R. S. Livingston, Director) · 1952 classic hands-on relevance 5 · hands-on 5 hosted

    Sequel quarter to ORNL-1339. The 86-inch calorimetered a record 41 kW proton beam (1.85 mA average at 22.5 MeV, 330 kW oscillator input, 40% net ion-loading efficiency), with beam energy established independently by foil stack, calorimetry, and production yields; a Selsyn-driven rotator now optimizes ion-source position during operation. The 63-inch got first beam May 20, 1952: N3+ identified on a brass probe target by gamma count (8x background) plus an energy argument, then beam current mapped vs radius (2000 uA at 5 in falling to ~1 uA at extraction radius) and species/energy confirmed by activation half-lives. The 22-inch studies rf and dc electrodes for accelerating ions from source into the dees, including a curved median-plane-focusing electrode worth 15%. Radiation-damage work isolates proton-induced corrosion using thermal-history and thermal-gradient control experiments.

    cyclotron-generalbeam-measuremention-sourcerfextractionsafetymaterials

  32. Central Region Studies for Incorporating an Axial Ion Source in the Davis 76" Cyclotron

    L. J. Kibbe, J. A. Jungerman, N. F. Peek (Crocker Nuclear Laboratory, UC Davis) · 1966 classic hands-on relevance 4 · hands-on 4 hosted

    Short conference-style report on retrofitting the Berkeley 88-inch axial ion source into the Davis 76-inch (an ORIC copy) through an 8-inch steel plug in the lower pole. A 0.275-scale model magnet at Oak Ridge set the initial central-region iron design, but could not reach the lowest (3.5 kG) field level; full-scale mapping then exposed a defocusing low-field depression, fixed by moving the plug to 5.5 in from the valley floor with 3.5-in caps that saturate at high field but fill the central hole at low field. Because the axial source is confined to r < 2.5 in, orbit centering forces comparatively low dee voltages (20-30 kV). Trim-coil isochronization via linear program held deviation under 15 gauss; orbit-code studies (starting conditions obtained by decelerating ions inward from a 12-in equilibrium orbit) covered phase slip, betatron tunes, and a benign 3/3 resonance crossing. A deliberate central field bump beat the strictly isochronous setting by ~10% in extracted beam.

    ion-sourcemagnetbeam-dynamicscyclotron-generalmodeling

  33. Cyclotron Component Design Technical Reports (TID-454) — seven technical reports of the Carnegie Institute of Technology ONR-AEC synchrocyclotron project

    M. H. Foss, D. Rose, E. M. Williams, L. W. Johnson, H. M. Collins, C. H. Grace (Carnegie Institute of Technology, ONR contract N7-onr-303) · 1952 classic hands-on relevance 5 · hands-on 4 hosted

    Compendium of seven separately-authored technical reports from the Carnegie Tech 435-MeV synchrocyclotron project (companion to NYO-780, the same project's final construction report). Report 1 (Foss, 103 pp) is this collection's only fully cost-driven magnet design treatment: pole-tip potential theory, shim/spike shaping, coil winding and cooling arrangements, and explicit dollar-optimization of coil OD, coil height, pole-base/yoke cross sections and operating field against unit costs of steel ($/cm3), copper ($/cm3) and electrical energy ($/10-year-watt), solved by nomograph with a worked 130-in/14-in-gap sample; closes with null-galvanometer field-measurement methods. Report 4 (Rose) is a complete conductance-budget design of the vacuum system as an electrical-analog network, from inside the dee out to the pumps, with pump sizing by throughput comparison and an automatic fault/interlock sequence; its appendices derive S=400A^2/OL for noncircular ducts from Knudsen and tabulate the rectangular-duct correction factors handbooks skip. Report 7 (Grace) is a full circuit-level design of the deflector-trigger frequency discriminator (heterodyne against ovened crystals, <1 microsecond firing error on a 2500 Mc/s FM sweep). Reports 2 (cloud-chamber coils), 3 (megagauss-field limits), 5 (rotating condenser) and 6 (3/4-scale model oscillator test) round out the set.

    magnetcoilsvacuumrfextractionbeam-measurementfabricationcyclotron-general

  34. Residual Radiation of the LRL 184-Inch Cyclotron (ORNL-3158)

    R. W. Boom, K. S. Toth, A. Zucker (Oak Ridge National Laboratory, Electronuclear Research Division) · 1961 classic hands-on relevance 3 · hands-on 4 hosted

    Five-day measurement campaign (Nov 1960) of residual radioactivity at the LRL 184-inch synchrocyclotron (730 MeV protons, ~1 uA average, running 21 shifts/week), done to scope a proposed 100-uA 850-MeV machine. Three methods: calibrated GM survey at mapped vault positions with decay curves; collimated 3x3-in NaI gamma spectroscopy of the magnet-gap region (256-channel analyzer, Na22 calibration, spectrum unfolding); and Al/Cu/Fe/stainless witness foils hung in the vault before shutdown, identified by gamma energy and half-life on a 2x4-in NaI. Key empirical result: the induced nuclide inventory is a function of MATERIAL - Cu gave Cu64 then long-lived Co58; Fe gave Mn56/Mn52 early and essentially only Mn54 long-term; stainless added Cr-51 and Co58 (from Cr and Ni content); Al gave only 15-hr Na24 and was dead two weeks after shutdown. A Cd-wrapped vs bare Cu foil pair separated fast-particle from slow-neutron activation (~1/1.6). Concludes with material-choice and shadow-shielding recommendations (0.6 cm Pb half-thickness for the dominant 510/810 keV lines).

    shieldingsafetymaterialscyclotron-generaldetectors

  35. Radiation Exposures of Personnel at the 60-Inch Cyclotron (UCRL-8276)

    Peter F. McWalters, W. Barclay Jones, Margaret A. Kerr, Roy F. Burton (Crocker Laboratory, UC Berkeley) · 1958 classic hands-on relevance 3 · hands-on 4 hosted

    Five-year (1953-1957) personnel-dosimetry review of the Crocker 60-inch cyclotron crew: film-badge totals per worker, dose per class of operation (target setup/removal/dismantling, scattering setups, deflector and exit-strip changes), Speedomax chart recordings of target-area dose rate versus time after beam cutoff for alpha/proton/deuteron bombardments, and an 8-site cross-institution comparison table (CIT, Columbia, MIT, Pittsburgh, Princeton, Rochester, Yale, Crocker) from NYO-4699. The operational discipline is the real content: a permanent wide-range beta-gamma meter 3 ft from the target so cooling time is measured rather than guessed; choreographed handling (3 min target setup, 1 min removal, <1 min dismantling behind a 2-in lead-glass shield); deuteron runs quarantined to weekends with 25-30 min cooling. Average exposure fell from 0.165 to 0.1 r/man/week as techniques improved despite more target changes; finger films showed hands get ~10x body dose.

    safetyshieldingtargetscyclotron-general

  36. Self-Supported Cyclotron Targets of Boron and Magnesium (ORNL-3021)

    G. R. Hoke, E. Newman (Oak Ridge National Laboratory, Electronuclear Research Division) · 1961 classic hands-on relevance 4 · hands-on 5 hosted

    Complete lab recipe for making self-supporting thin boron (and magnesium) films for cyclotron nuclear-physics targets, from the group running the ORNL 63-inch heavy-ion machine. Boron: pack ~250 mg amorphous boron powder in a covered slotted boat machined from 5/16-in spectroscopic-grade carbon rod (drawing included, ORNL-LR-DWG 52263); in a Veeco VE-400 evaporator below 1e-5 mm Hg, run ~280 A at 8 V until white heat vaporizes the boron onto 3.25 x 4-in glass plates; boats survive at most two runs before the slot clogs with boron carbide. Film recovery: float off in warm tap water from Calgonite-washed plates tilted ~20 deg, pick up on 0.030-in aluminum frames; folding the film double over the frame is far more robust than single thickness; a pinch of detergent cuts surface tension and breakage. Enriched B-10 double films came out 50-100 ug/cm2. Magnesium section: in-situ reduction of MgO on tantalum boats (~100 A, <2e-5 mm Hg) with a 5-10 ug/cm2 arc-carbon parting/support layer, films 30-80 ug/cm2, plus a lantern-slide glass hood to recover expensive enriched isotope.

    targetsboron-11fabricationvacuummaterials

  37. Measurement of Beam Energy and Energy Distribution on an Internal Cyclotron Target (ORNL-1347)

    B. L. Cohen (Oak Ridge National Laboratory, Electromagnetic Research Division) · 1952 classic hands-on relevance 5 · hands-on 5 hosted

    The wave's highest-value document for energy-convention discipline. Cohen measured the actual energy and energy spectrum of protons striking an INTERNAL target of the ORNL 86-inch cyclotron and found it could differ by as much as +/-10% from the standard B-rho calculation (field strength x orbit radius, center assumed at the source), and that the energy of maximum intensity moved by several hundred keV under minor changes of ion-source position, dee voltage, field tuning, and oscillator frequency. Two absorption methods, both accuracy-limited to a few hundred keV by range-energy knowledge and straggling: (1) photographic film behind a stepped aluminum-foil absorber, exposed at ~0.1 uA-sec with the arc off and the field detuned to throttle current - densitometer readout converted to an energy spectrum, and also giving radial beam width vs energy; (2) a stack of ~6 mg/cm2 copper foils activated via Cu63(p,n)Zn63 (38-min beta), unfolded against the published excitation function by solving a nearly triangular system of linear equations (~30 minutes by hand). High-energy edge is trustworthy; low-energy side of the spectrum much less so.

    beam-measurementtargetsbeam-dynamicsdetectors

  38. Spatial Distribution of Current on an Internal Cyclotron Target (ORNL-1348)

    B. L. Cohen (Oak Ridge National Laboratory, Electromagnetic Research Division) · 1952 classic hands-on relevance 4 · hands-on 5 hosted

    Companion to ORNL-1347: maps WHERE the beam lands on an internal target and reads the map back as beam physics. A probe target holding 17 carbon foils (1/32-in thick, 5.5-in long) was bombarded 15 min at 15 uA in the ORNL 86-inch cyclotron; each foil was snapped into 1/2-in sections along pre-scored lines and Geiger-counted (20-min C12(p,pn)C11 plus long-lived impurities, in agreement), yielding intensity-vs-depth curves and full 2-D isointensity contour maps of the beam spot for several machine conditions. The turn-to-turn radial step derives as dr/r = 2*(energy gain per turn)/E with dE = 4*V0*cos(theta) for a two-dee machine, so the measured radial step IS a measurement of RF phase: tabulated results give phases of 50-72 deg for dee-to-dee voltages of 240-335 kV. Also documented: an ungrounded (floating) ion source substantially changes the radial width; detuning the field 0.4% should shift phase 45 deg but moved it only ~10 deg because resonant ions are lost by defocusing and later-phase ions take over; residual radial grouping puts the principal bunch at 74 deg (Curve A) / <65 deg (Curve D), matching theory.

    beam-measurementtargetsbeam-dynamics

  39. A Proposal for the Mc2 Isochronous Cyclotron — A General Purpose High-Intensity 810-MeV Proton Accelerator

    ORNL Electronuclear Division staff (editorial committee R. S. Livingston, J. A. Martin, A. Zucker; RF chapter N. F. Ziegler) · 1963 classic hands-on relevance 3 · hands-on 4 hosted

    Complete engineering proposal for an 810-MeV, 100-uA eight-spiral-sector isochronous proton cyclotron ("meson factory") that was never built (the Ramsey Panel had already declined priority to sub-1-BeV machines, p.16). Its distinctive value is that a proposal preserves the alternatives being weighed, not just the winner: energy chosen as an explicit three-way compromise (cost / physics value / extraction fraction), sector number set by essential-resonance analysis, dees rejected because magnet-gap cost would be "increased unreasonably" in favor of vertical TEM cavities between sectors, injector alternatives rejected with enumerated defects, and two competing magnet-field concepts carried through model tests. Includes the full electron Cyclotron Analogue II program (iron-free 8-sector machine that demonstrated 80% extraction and exposed a probe-scattering diagnostic artifact and a geomagnetic-field resonance), a design-stage shielding methodology chapter (source terms, attenuation, maze/duct algebra, stepped shield plugs), a fully documented cost estimate (engineering 15%, contingency 15-40% by estimate precision, escalation 4%/yr, ~$11.5M of items traced to named vendor quotes), and a CPM schedule iterated from 8yr10mo down to 6yr9mo by attacking the critical path.

    cyclotron-generalmagnetrfshieldingbeam-dynamicsvacuumfabrication

  40. Electromagnetic Research Division Quarterly Progress Report, Part I, for Period Ending December 31, 1951

    F. T. Howard (ed.), Electromagnetic Research Division, ORNL (R. S. Livingston, Director) · 1952 classic hands-on relevance 5 · hands-on 5 hosted

    First report of the 22-inch-era run (the machine is still "the 22-inch test cyclotron", a 1949 pilot for the 86-inch). The gem is the radius-wise fine-structure scan: a 0.020-in. tantalum wire probe moved from 1.2 to 11.5 in. resolves INDIVIDUAL proton orbits, first turn through the twelfth, maxima 5/8 in. apart for inner orbits, inter-orbit minima never below one-third of maximum; Fig. 12 (dee bias 600 +/- 100 V, 9.2 and 12.0 kV dee-to-dee) shows the turn structure directly, taken to guide a planned electrical-focusing grid. Also: an adjustable deflector extracts 38% of a 1000-uA internal beam; first dc-injection tests find injection potentials above the 10-kV dee voltage DECELERATE ions between electrode and dee. A fundamentals section describes a high-potential (1-20 kV) ion source for multiply charged ions whose electrode-to-field alignment proved critical and whose gas feed collapsed the mean electron energy. The 86-inch (19.4 MeV, 5.5 kW beam) and 63-inch (in assembly) sections are production-machine material.

    cyclotron-generalbeam-measurementbeam-dynamicsion-sourceextraction

  41. Electromagnetic Research Division Quarterly Progress Report for Period Ending September 30, 1952

    F. T. Howard (ed.), Electromagnetic Research Division, ORNL (R. S. Livingston, Director) · 1953 classic hands-on relevance 5 · hands-on 5 hosted

    Coverage 30 Sep 1952 (issued Feb 1953) - the last report in which the machine is called "the 22-inch"; sits two quarters after the already-indexed ORNL-1339/1345. The 22-inch program is a systematic beam-current campaign: ion-source output measured approximately proportional to effective slit length (1/2 vs 2-5/8 in. apertures gave 35 vs 170 mA at identical arc and 10 kV); dc-injection optimum found to be 1-3 kV as judged by beam AT FULL RADIUS (10.5 in.) even though current 1.5 in. from the source keeps rising to 8.5 kV - the divergence diagnosed as a focus change, the classic near/far transmission trap. A floating-wire loop survey (#32 enameled wire, ~5 A dc, position of unstable equilibrium) locates the median plane within +/-0.125 in. and the magnetic center within +/-0.25 in. of geometric. The ion-source testing unit is rebuilt around a portable 5771-triode oscillator direct-coupled to the dee stems; its dee voltage is expected to be capped by a 1.5-in. dee-stem clearance OUTSIDE the vacuum tank. 86-inch (record 75% uptime at 767 uA) and 63-inch (25-MeV N3+ chemistry) sections are production-machine material.

    cyclotron-generalion-sourcemagnetbeam-measurementrf

  42. Electromagnetic Research Division Semiannual Progress Report for Period Ending March 20, 1953

    F. T. Howard (ed.), Electromagnetic Research Division, ORNL (R. S. Livingston, Director) · 1953 classic hands-on relevance 5 · hands-on 5 hosted

    The rename report: footnote on PDF p. 17 - "Formerly referred to as the 22-in cyclotron, cf The 44-in Cyclotron, this report" - and the 44-in. section (PDF p. 20) explains why: the test machine, "assembled from available equipment in 1949 as a preliminary to the design and construction of the 86-in. cyclotron", allowed a 22-in. maximum orbit, but since the poles are 44 in. the machine "is more appropriately identified as the 44-in. cyclotron" as modifications for wider oscillator power and beam energies begin. Its dc-injection campaign concludes soberly: several dc electrode geometries tested, NONE beat the standard rf electrode to full radius. 86-inch material of high value: "half-coils" (conductor wrapped halfway around a pole, pole completes the circuit) shift the beam center 3.6 in. and sweep fixed-target energy 18-23 MeV; a thin-wall stainless septum mockup (0.025-in. OD, 0.003-in. wall) dissipates 190 W/in. water-cooled but 304 activation forces a move to aluminum; vacuum-furnace Al-Si brazing of Be targets reaches 100% bond vs 40-60% for flux brazing; p-on-Be gives ~1 neutron per 50 protons. Also preliminary studies of an 80-MeV heavy-particle machine and a variable-energy 5-10 MeV cyclotron (+/-10 keV energy definition judged feasible, ~$1M).

    cyclotron-generalmagnetextractiontargetsion-sourcebeam-dynamics

  43. Electronuclear Research Division Semiannual Progress Report for Period Ending September 20, 1953

    F. T. Howard (ed.), Electronuclear Research Division, ORNL (R. S. Livingston, Director) · 1954 classic hands-on relevance 5 · hands-on 5 hosted

    First report from the renamed division (Electromagnetic -> Electronuclear) and the design report for the 44-inch rebuild. The revised machine (PDF p. 18): new 22-in.-radius dees, 7.5 in. thick, in a vertical plane on 7-in.-dia horizontal stems; whole dee system insulated from ground for bias against ion loading; flat shims REMOVED from the tank to widen the gap to 13.5 in. purely to clear 100-kV dee operation; spec table - 6400 oersteds, 44-in. dees, 9.7 Mc/sec, F-134 tube, ~200 kW. Two rules of lasting value: the filament-coupling circuit is the ONE rf component deliberately left undesigned because it "cannot be designed until" the resonant dee system's characteristics are measured; and the removable 14-in. spacer scheme (given as 14.5 in. in ORNL-1670) lets one machine run at 11-in./1.5-MeV or 20-in./4.9-MeV target radius by shifting dees and target while the ion source and orbit centering stay fixed. The variable-energy heavy-particle study (PDF p. 19) develops rf on an 8-ft electrical model of the 63-inch dee stems: a self-excited push-pull oscillator direct on the stems wins (two controls, drive-insensitive frequency); coupled-secondary tuning spans 6-12 Mc but its low Q makes resonant impedance swing. 86-inch and 63-inch sections are production-machine material.

    cyclotron-generalrfdeemagnetfabrication

  44. Electronuclear Research Division Semiannual Progress Report for Period Ending March 20, 1954

    F. T. Howard (ed.), Electronuclear Research Division, ORNL (R. S. Livingston, Director) · 1954 classic hands-on relevance 5 · hands-on 5 hosted

    The 44-inch rebuild moves from design to fabrication (PDF p. 20): design "essentially completed"; make/buy split recorded - liner, dees, and dee-stem housing to an outside contractor, faceplates, dee stems, ion source, target probe, and vacuum system made in-house (the outsourced items are exactly the ones that come back defective in ORNL-1795/1884). The signature magnet rule: pole faces (tank walls) ground with a PORTABLE GRINDER toward +/-0.01% uniformity explicitly to "provide a standard base for the various magnetic shim designs that may be tested" - flatten the base field BEFORE shim experiments so shim effects are measured against a known zero. Fig. 6 (PDF p. 21) shows the 14.5-in. spacer in place, moving the dees back from field center for 1.5-MeV very-high-current test operation. The 114-inch heavy-ion proposal section (PDF pp. 22-24) includes a sweep-and-store automatic oscillator tuning servo (error ~0.1%) and low-pass-filter dee-stem coupling tests on the 63-inch model. 86-inch and 63-inch sections are production-machine material.

    cyclotron-generalmagnetfabricationrf

  45. Electronuclear Research Division Semiannual Progress Report for Period Ending September 20, 1954 (Part I - Unclassified Work)

    F. T. Howard (ed.), Electronuclear Research Division, ORNL (R. S. Livingston, Director) · 1954 classic hands-on relevance 5 · hands-on 5 hosted

    Part I (unclassified) only is held; assembly of the rebuilt 44-inch approaches completion (PDF p. 19) and the outsourcing bill comes due: the contractor-delivered dees leaked at "several leaks in very inaccessible locations" in the internal water-cooling tubes - windows had to be CUT THROUGH THE SIDES OF THE DEES and closed by Heliarc welding - and the liner is still undelivered. Pole grinding and shimming continue; the field is "now uniform to within 0.05%" (against the 1670 aspiration of +/-0.01%). The 114-inch study contributes a quarter-scale model magnet whose gap is set in a VERTICAL plane for probe access and whose pole tips are removable "so that shims of any shape can be inserted readily", plus a pneumatic-pressure movable rf joint: copper-plated stainless best of materials tested, 100 A per lineal inch held below 10 degC rise on 0.5 gpm. The proposed conversion of the 44-inch to a 48-inch heavy-particle machine appears (PDF p. 23): new magnet and tank only, every other subsystem reused, N5+ to ~89 MeV. 86-inch and 63-inch sections are production-machine material.

    cyclotron-generalfabricationmagnetrfmaterials

  46. Electronuclear Research Division Semiannual Progress Report for Period Ending March 20, 1955

    F. T. Howard (ed.), Electronuclear Research Division, ORNL (R. S. Livingston, Director) · 1955 classic hands-on relevance 5 · hands-on 5 hosted

    Last report of the run: the revised 44-inch is "assembled and vacuum-tested" (Fig. 5 photo, PDF p. 19) with its signature mechanical solution - the whole dee system cantilevered from the outer end of the dee stems, the mounting carried ON INSULATORS so a dee bias can be applied; the dee-stem housing liner was delayed by contractor brazing errors. The heavy-particle study (PDF p. 20) opens with a five-point retrospective on the 63-inch - the price of building from adapted equipment: unshieldable, marginal field (median plane drifts, hard to keep shimmed), bushing-insulator stems capping dee-to-ground at ~40 kV, a 6-in. gap "less than half of what it should be", and a single-species resonant system. The 48-inch conversion spec (Table 3) reuses every major 44-inch component and sets design dee-to-dee at 200 kV against a 110-kV N5+ threshold (~1.8x margin); the magnet study wants 29 tons of copper and 1050 kW; siting is below grade next to Building 9204-3 explicitly because an underground room "will be easy to shield". A 1-BeV study section (PDF p. 35) extends Thomas azimuthally-varying-field theory with ORACLE calculations, MURA spiral sectors, and plans an ELECTRON-MODEL accelerator to test imperfection-resonance crossing before any proton machine.

    cyclotron-generaldeerfsafetybeam-dynamicsproject-management

  47. The Design of a Focusing and Analyzing System for the 27" Cyclotron Beam

    D. A. Bromley and J. A. Bruner (Physics Department, University of Rochester) · 1954 classic hands-on relevance 5 · hands-on 5 hosted

    Complete design study — with full worked algebra and a commissioning postscript — of the external-beam transport line for the rebuilt Rochester 27" cyclotron (~7-8 MeV protons, B-rho design value 4e5 gauss-cm): a strong-focusing quadrupole doublet "condenser" focuses the extracted beam onto a shielded precision slit, and a modified sector ("wedge") magnet double-focuses and momentum-analyzes the slit image onto the target. The doublet chapter derives thin-lens design equations from Courant-Livingston- Snyder, sizes hyperbolic poles around the measured 2 cm x 6 cm extracted-beam envelope with stacked safety factors, and lands on a 355-lb, 1-kilogauss, air-cooled pair versus an estimated 3-ton sector alternative (weight/power ~10-20x savings documented). The analyzer chapter works Cross's double-focusing wedge formalism into practical geometric equations (claimed first publication), reuses an existing C-magnet with only ~5 degrees shaved off the pole sides, and predicts 0.07%/mm-of-slit momentum resolution. An October 1954 supplementary note reports commissioning: alignment critical, 60-70% of beam through a 1x4 mm slit, floating-wire check of the wedge (image distance 15% long), and expected 0.1 uA at ~0.2% energy spread on target.

    magnetbeam-dynamicsextractioncoilsfabricationshielding

  48. Broad Range Spectrograph for Use with the Rochester 27" Cyclotron

    W. Parker Alford, O. M. Bilaniuk and R. A. Hawrylak (University of Rochester) · 1961 classic hands-on relevance 4 · hands-on 5 hosted

    Design, construction, and calibration report for a deliberately simplified Buechner-Bainbridge 90-degree broad-range magnetic spectrograph (characteristic radius R=50 cm) on the Rochester 27" cyclotron's analyzed external beam. One field setting focuses particles over 0.6-1.3 E0 onto a hyperbolic focal surface with dE/E < 0.2%; the practical upper limit is set by vacuum-chamber size, not optics. Because the instrument was never meant for absolute energy measurement, the authors relaxed the 0.1% field-uniformity spec, collapsed the yoke to a simple C, and put the return yoke on the "wrong" (concave) side — measured few-tenths-percent nonuniformities proved identical at 6.8 and 14 kG and therefore harmless, and the layout bought scattering angles out to 165 degrees. Construction details include pole tips that double as the vacuum chamber, a 3/4" gap held to 0.0001" with brass spacers, and a 5-ton magnet hand-cranked around a 70" track ground flat in place to 0.01". Calibrated end-to-end with a Po alpha source stepped through field settings, which yielded the solid-angle curve for free; nomograms and IBM-650 kinematics tables made it a routine tool.

    magnetbeam-measurementdetectorsbeam-dynamicsfabrication

  49. A Fast Neutron Time of Flight System for Use with Cyclotrons

    H. W. Fulbright, J. W. Verba, V. K. Deshpande and A. K. Hamann (University of Rochester) · 1962 classic hands-on relevance 5 · hands-on 5 hosted

    Practical engineering report on a nanosecond neutron time-of-flight spectrometer whose central trick is using the cyclotron's own RF oscillator as the timing reference: the beam is already naturally bunched (within the first few turns, after Konradi), so a 10" wire antenna near the oscillator grid circuit — with shunt cable stubs to tune the harmonic mix — delivers smooth, identical, beam-current-independent stop pulses with 3-5 ns rise. A transistorized time-to-pulse-height converter (6BN6 gated integrator) is STARTED by the neutron detector and STOPPED by the next RF pulse, feeding a standard 100-channel analyzer; a separate slow pulse-height channel, reset against the Cs-137 gamma peak, provides reproducible thresholds for absolute efficiency and background rejection. Achieved 2 ns FWHM (typically 2-3.5 ns) with ~1 ns/channel; flight paths were kept under 1.2 m to stay above floor-scattered neutrons without shielding the counter. Includes a single-scattering absolute-efficiency formula (first factor exact), D(d,n) calibration to 4% with a 10% activation cross-check, and a beam-pulse scaler that deflects at an RF subharmonic (~3 Mc) to prevent frame-overlap for slow neutrons, with the odd-vs-even subharmonic subtlety worked out.

    detectorsrfbeam-measurementshieldingphysics-theory

  50. Half-Scale Model Tests on the Three Quarter Wave R.F. System for the 184-inch Frequency Modulated Cyclotron (UCRL-31)

    Robert L. Anderson (work by J. Franck, J. Reidel, R. L. Anderson under K. R. MacKenzie; UC Radiation Laboratory, Berkeley) · 1947 classic hands-on relevance 4 · hands-on 5 hosted

    Bench report on a half-scale electrical model of the 184-inch synchrocyclotron three-quarter-wave RF system — the middle step of the MacKenzie lineage's deliberate three-stage chain: MacKenzie's BP-140 calculations (Sept 1947), this model, then full-size bench tests before installation. The model reproduced only the RF circuit (vacuum, mechanical gear, and DC-bias insulation deliberately omitted as having "no radio frequency function"), driven by substitute 304-TL triodes standing in for the full-scale 9C21s. Systematic experiments mapped what sets the tuning range: dummy-dee capacity, rotor minimum capacity, and dee-throat inductance; demonstrated trim fixes (shorted stubs to raise frequency, liner plates to lower it); found and fixed an in-band choke self-resonance; measured capacities by bridge subtraction (rotary condenser swing 1370 -> 50 uuf, ratio 27.6); and measured power/efficiency (~60%) with diode probe voltmeters (+/-5-10%) and an optical-pyrometer plate-dissipation method. Model power at 1500 V dee was extrapolated to 146 kW at 30 kV full scale using the classic scale-model law (P scales as V^2 with a sqrt(2) shunt-impedance credit for doubled size at halved frequency — the printed numbers match it exactly). Verdict: proceed to full-scale "based on the model dimensions."

    rfdeemodelingmatchingfabricationcyclotron-general

  51. Computational Study of Factors Determining the Optical Characteristics of a Resonant Extraction System for a 3 Sector Cyclotron (MSUCP-9)

    H. G. Blosser and M. M. Gordon (Michigan State University Cyclotron Project) · 1961 classic hands-on relevance 4 · hands-on 3 hosted

    Early computational orbit-dynamics practice: median-plane orbit tracking on MSU's MISTIC computer to design nu_r = 1 resonant extraction for the proposed 3-sector cyclotron, in the B26.1R field (measured on an 8.75-inch model magnet, scaled x64/8.75, Fourier-analyzed vs radius, isochronized, with a ~1% cos-theta extraction bump added). Two codes: a Fixed Point Code finding closed orbits by linear transfer matrix, and a General Orbit Code tracking arbitrary orbits with median-plane-exact equations, with or without acceleration. Method: map static (r,pr) phase plots at several energies (separatrices traced by launching orbits forward and backward in time from near the unstable fixed points), treat acceleration as impulsive energy kicks at the two gap azimuths, then interpolate. Accelerated runs of particle grids (square-wave 280 kV/turn, checked against sinusoidal) quantify distortion; the winning beam achieves 0.006 cyc-unit turn separation with moderate distortion. Distills the design doctrine: the "static effect" (flow-rate gradients on a fixed plot) distorts, the "acceleration effect" (plot shifting with energy) separates cleanly, so program the beam around flow-gradient regions and keep volts-per-turn high. Also identifies and hand-validates the gap-crossing resonance.

    extractionbeam-dynamicsmodelingmagnetphysics-theory

  52. Computation of Electric Field and Potential of an Idealized Dee Geometry (MSUCP-12)

    J. W. Beal (Michigan State University Cyclotron Project) · 1961 classic hands-on relevance 5 · hands-on 3 hosted

    Complete closed-form solution (Schwarz-Christoffel, following Murray & Ratner JAP 24, 67 (1953) "with annotations and corrections" from Murray) for the electric field and potential of an idealized 2-D dee geometry: two semi-infinite zero-thickness plate pairs at y = +/-h (median plane y = 0), at potentials -V0 and +V0, with tip-to-tip gap 2k. All lengths scale with h and all fields with V0/h, so the results are size-independent. Gives the general off-median-plane field (eqs. 1-5), the much simpler median-plane specialization E_x = (V0/h) sech(X1)/(1 + alpha sech^2 X1) with X = X1 + alpha tanh(X1) (eqs. 6-8), and M. M. Gordon's Newton iteration (eq. 9, quadratic convergence, works for all gap ratios where Murray-Ratner's iteration fails). A MISTIC program (D. A. Johnson) tabulated E/(V0/h) and V/V0 at x/h = 0(0.2)5.0 for nine gap ratios k/h = 0.1-3.5 (Table 1) — a ready-made 5-digit benchmark set.

    deerfmodelingbeam-dynamicsphysics-theory

  53. Accelerator Radiation Protection (US Army Natick Laboratories Technical Report TR-73-7)

    Thomas G. Martin III (editor); chapter authors Ari Brynjolfsson, Raymond D. Cooper, Francis J. Mahoney, Thomas G. Martin III, Christopher W. Rees (US Army Natick Laboratories, Food Laboratory / Radiation Sources Division) · 1972 classic hands-on relevance 5 · hands-on 4 hosted

    Eight-chapter reference written to support drafting a US Army regulation on particle accelerator radiation protection, deliberately scoped to machines BELOW 40-50 MeV — the closest thing in this collection to a radiation-protection manual for small accelerators. Covers the whole RP problem end-to-end: X-ray production and concrete shielding with worked attenuation tables (Ch. II), neutron production thresholds and removal-cross-section shielding with worked examples (Ch. III), induced radioactivity in targets/shielding/air/water with activation bookkeeping (Ch. IV), radiological physics and the 1972 exposure-limit framework (Ch. V), instrument choice and the statistics of counting pulsed accelerator radiation (Ch. VI), access limitation, maze scattering estimates, and fail-safe interlock design patterns drawn from Toronto/Los Alamos/ SLAC/LRL practice (Ch. VII), and waste effluents including ozone production and delayed-entry calculations (Ch. VIII). Chapter map (PDF page / printed page): I Accelerator Radiation Protection, Martin — p.10/1; II X-Ray Production and Shielding, Brynjolfsson & Martin — p.22/13; III Neutron Production and Shielding, Mahoney — p.45/36; IV Radioactivity Induced in Accelerator Installations, Cooper, Martin & Brynjolfsson — p.76/67; V Radiological Physics and Radiation Exposure Limits, Mahoney, Martin & Cooper — p.104/95; VI Measuring Radiation from Charged Particle Accelerators, Cooper, Mahoney & Martin — p.121/112; VII Access Limitation and Interlocks, Martin & Rees — p.144/135; VIII Waste Effluents, Martin — p.161/152.

    safetyshieldingdetectorscyclotron-general

  54. The Columbia University Nevis Synchrocyclotron Major Modification (Nevis-189 / R-774 / CU-295)

    J. Rainwater, R. Cohen, K. Ziegler, R. Schneider, P. Yen, M. Holland, J.M. Brennan, I.S. Hammerman (Columbia University Nevis Laboratories) · 1971 classic hands-on relevance 3 · hands-on 5 INSPIRE ↗ archived Aug 2026

    Complete description of the 1970-71 conversion of the Nevis 385 MeV synchrocyclotron to a 550 MeV sector-focused synchrocyclotron with 10-40 uA extracted beam. Part I reproduces the four Columbia papers from the March 1971 (PAC) Accelerator Conference: overall status (sector-iron design by trial-and-error against Smith-Garren tune formulae, model-magnet program, resonance avoidance learned from ORIC), the RF system (half-wave dee resonator tuned by two rotating capacitors with ferrofluidic shaft seals, 1/2-scale modeling, multipacting bias, adiabatic RF turn-off at a parking frequency), the 3400 A iron-free current extraction channel (flared septum, per-wire thermocouple protection, empirically calibrated image factor), and secondary pion/muon beam channel design with the BARTELBE/MAGSYS optimization codes. Part II is Rainwater's 55-page elementary-to-advanced tutorial on synchrocyclotron physics: phase stability, space-charge limits, dee-bias multipacting suppression, and peeler-regenerator extraction.

    rfmagnetextractionsealsbeam-dynamicssafetyshieldingcyclotron-general

  55. Recent Trends in Particle Accelerator Radiation Safety

    W.F. Ohnesorge, H.M. Butler (ORNL Health Physics Division) · 1974 classic hands-on relevance 4 · hands-on 2 OSTI ↗ archived Aug 2026

    Six-page literature-survey overview of 1970-74 trends in accelerator radiation safety for the Conference on Use of Small Accelerators. Covers the rise of computerized health-physics information centers, the new manuals (Patterson & Thomas; Martin AD-755510), tritium control, interlock/safety-equipment trends (solid-state fail-safe self-checking logic replacing relays, sneak-circuit analysis, engineering standards), dosimetry and shielding data (ORNL half-value thickness ~10 cm ordinary concrete for cyclotron-target neutrons), the shift toward formal safety programs with safety officers and review committees, and the AEC's As Low As Practicable (ALARA) exposure philosophy. 31-entry bibliography is a useful map of period safety literature.

    safetyshieldingcyclotron-general

  56. Character of the Radiation Field and Shielding at the 184-Inch Cyclotron (AECD-2149)

    B. J. Moyer, R. Hildebrand, N. Knable, T. J. Parmley, H. York (University of California Radiation Laboratory) · 1947 classic hands-on relevance 4 · hands-on 5 hosted

    Six-page declassified measurement report (manuscript June 1947, presented at the July 1947 APS Stanford meeting) on the fast-neutron field of the 184-inch cyclotron running 200 MeV deuterons and the attenuation measurements used to plan its final shield. Method: slab-under-test in front of a detector recessed in a concrete "igloo" cavity, aluminum-walled ionization chambers with DC amplification read on meters outside the magnetic field, every reading normalized to a beam monitor; repeated with water tanks and with carbon-disc activation detectors (C12(n,2n)C11, ~20 MeV threshold) sandwiched between slabs. Documents transition (buildup) effects — attenuation curves only go exponential after the beam reaches equilibrium with its secondaries, and paraffin behind Fe or Pb RAISES the reading 60-100% — plus a half-value-thickness table for Pb/Cu/Al/C/CH2, the Z-dependence argument (cross section per nucleon falls with Z, hence high density + low atomic number, hence concrete), dose readings inside/outside the shield normalized to 0.2 uA of deuterons, and BF3 measurements of slow-neutron diffusion through access openings. This is the PUBLISHED counterpart of the "unpublished data" Moyer reference (ref. 10) in ad-755510 Ch. III, and Moyer is the later originator of the Moyer model of accelerator shielding — this 1947 paper is that lineage's starting point in this collection.

    shieldingsafetydetectorsbeam-measurementcyclotron-general

  57. Preliminary Report on the "Three Quarter Wave" R.F. System for Frequency Modulated Cyclotrons (AECD-1850)

    Kenneth MacKenzie (University of California Radiation Laboratory) · 1947 classic hands-on relevance 3 · hands-on 4 hosted

    Theory plus half-scale model measurements for the 3/4-wavelength RF system of the 184-inch synchrocyclotron: a dee line with a rotating condenser at one-third of its length from the shorted end, sweeping 9-24 Mc to cover both proton and deuteron ranges. Develops the two fundamental modes (antisymmetric tuned mode vs constant-frequency parallel/symmetric mode), wavetrap suppression, transmission-line coupling of grounded-grid 9C21 oscillators (modeled by Eimac 304TLs), Shanklin graphical phase-shift analysis of the filament drive, and an appendix deriving stub-voltage variation. The model-test narrative is the gold: 1/4-scale abandoned because tube transit time at 100 Mc falsified the physics; half-scale scaling law stated explicitly (f x2, L,C /2, Q_model = 0.7 x full scale, hence 1.4x power for a given dee voltage); a mysterious dee-voltage null at 20 Mc traced to the meshed condenser teeth acting as a folded half-wave transmission line; measured model powers (400-600 W for 1500 V dee) scaled to full-size predictions. Third MacKenzie RF document in the collection — same lineage as his mddc-1045 dee-voltage work and the UCRL scale-model method docs (ucrl-64, ucrl-31).

    rfdeematchingmodelingcyclotron-general

  58. Report of Cyclotron Operation, 1 July - 31 December 1969 (NRL Memorandum Report 2103)

    Cyclotron Staff, Cyclotron Branch, Nuclear Physics Division, Naval Research Laboratory (branch head R. O. Bondelid; engineering W. F. Weedman; operations P. F. McWalters) · 1970 classic hands-on relevance 4 · hands-on 5 hosted

    Semi-annual operations report of the NRL sector-focused cyclotron covering the half-year containing its first major engineering shutdown. Section IV is the payoff: a complete availability ledger for 1382.5 scheduled hours - 60.1% operating (518.7 h beam-on-target, 56.0 beam adjustment, 147.2 target setup, 109.4 development) vs 39.9% outage itemized by cause, with power supplies (10.2%) and vacuum (9.3%) dominating and RF (1.6%) and source changes (1.0%) minor; plus 360 h of scheduled engineering shutdown accounted separately. Section III is upgrade-in-service practice: a 200-channel latching fault annunciator with priority/ non-priority taxonomy (built because self-clearing faults like magnet overtemperature vanished before the operator could find the sensor), computer beam pulsing by dropping dee voltage to ~50% (below acceleration threshold but high enough to keep AFC and regulation locked), 6949V1 filament inrush/drop-out protection (1,700 A limit), ganging four tuning capacitors on one chain drive after multi-servo tracking failures, replacing the master oscillator with a frequency synthesizer (dee ripple 1.5% to 0.5%), redesigned ion-source motion-feedthrough seals (chevron Buna-N to dual O-rings in polished adapter rings), iron-channel wall collapse above 2000 A fixed with G-10 stiffeners and verified by deflection measurement at 3500 A, and cooling-water plumbing changes (42 to 60 gpm; standby pump) that unlocked higher dee voltage.

    cyclotron-generalrfion-sourceextractionvacuumsealsbeam-measurementfabrication

  59. Harvard University Cyclotron Laboratory Quarterly Progress Report, 1 June - 31 August 1964 (AD-607226)

    A. M. Koehler (cyclotron sections) with B. Gottschalk, K. Strauch, J. N. Palmieri, D. F. Measday, T. L. Houk, R. Wilson, R. V. Pound, K. T. Bainbridge, N. F. Ramsey, D. Kleppner et al. (Harvard Cyclotron Laboratory) · 1964 classic hands-on relevance 3 · hands-on 4 hosted

    Ten-page quarterly letter report (to ONR's J. H. Fregeau) from the Harvard 160-MeV synchrocyclotron. Machine section is four sentences of reliability gold: 1,680 hours of operation in the quarter (~18 h/day); the ONLY unscheduled losses were three days to failure of the refrigerator for the cold trap above the diffusion pumps and one day to inadequate diffusion-pump oil levels; one scheduled ~1-week shutdown installed the pulsed internal-beam deflection apparatus. Research sections carry two transferable techniques: a Faraday cup modified so different stopping materials can be swapped in front of the stopping plate without breaking vacuum, calibrated per-unit-beam against an ionization chamber; and a target areal-density survey by scanning a collimated beam and locating the Bragg-curve tail, which rejected reactor-grade carbon rod stock (1%/quarter-inch center, 2%/quarter-inch edge gradients, at 0.2% sensitivity) in favor of pyrolytic graphite. Also the era's program mix: proton radiosurgery patients, NASA radiobiology, neutron cross sections, the Pound gravitational red-shift rerun, and the first He-3 Zeeman and tritium masers.

    cyclotron-generalvacuumbeam-measurementtargetsdetectors

  60. Proceedings of the Fourth Annual International Conference of the Nuclear Target Development Society (ANL/PHY/MSD-76-1; CONF-750968)

    G. E. Thomas and F. J. Karasek (eds.); 21 papers, Argonne National Laboratory, 30 September - 2 October 1975 · 1976 classic hands-on relevance 5 · hands-on 5 OSTI ↗ archived Jun 2026

    The richest of the four INTDS volumes in the archive: the whole craft of nuclear target making in 1975, by the ~48 people who did it full-time. Session A: Adair & Kobisk's 41-page ORNL survey of every preparation technique (rolling, vacuum evaporation, electrodeposition, CVD, sputtering) with the IRML element-by-element process/thickness table and the full thickness-measurement toolkit (NBS sequence weighing, vacuum microbalance, quartz monitors, alpha/fission-fragment/beta energy loss, densitometry, low-geometry counting); Heagney's hexagonal-seed-layer trick for high-vapor-pressure metals; Thompson's complete build-it-yourself alpha energy-loss thickness rig (self-activated 212Pb source); Argonne's 90-target vacuum storage facility. Session B: Scaife/Hanley/Purser's tutorial on focused ion beam sputtering (duoplasmatron + einzel lens, yield physics, film properties); the Munich group's demonstration that parting-agent crystallites — not the evaporation — set target nonuniformity at large angles. Session C: Erskine's consumer's-eye tour of why heavy-ion targetry is hard and proton targetry is not (dE ~ Z^2); Yntema's carbon-stripper lifetime systematics (heating to 500 C buys 40x, motion another 5x); Berry on defocus/raster as foil life-extender. Session D: CORWIN'S "BEAM HEATING OF TARGET FOILS" — this collection's only quantitative beam-heat-load treatment: radiation vs conduction limits worked end-to-end for a real target, plus the moving-target extension and a built rotator. Maier-Komor's electron-gun paper (backscatter losses, substrate charging, condensation heating budgets); recipes for sulphides and reduced-metal (Ca) targets. The two "informal discussion" entries (C-5 target rolling, B-5 release agents) are title pages only — the discussions were not transcribed.

    targetsfabricationmaterialsbeam-measurementvacuum

  61. Fifth Annual Conference of the International Nuclear Target Development Society (LA-6850-C)

    Judith C. Gursky and John G. Povelites, compilers (Los Alamos Scientific Laboratory); ~20 papers + recorded discussion sessions, authors from LASL, ORNL, ANL, Chalk River, NRC Canada, Stanford, Munich, Strasbourg, MicroMatter Co. · 1977 classic hands-on relevance 4 · hands-on 5 OSTI ↗ archived Dec 2025

    Proceedings of the 5th INTDS conference (Los Alamos, Oct 19-21 1976): the working craft of nuclear target laboratories, reproduced from typescript. Core papers for the thick/durable-target problem: Ramsay (Stanford) tests stripper-foil alternatives and argues foil death is MECHANICAL — the beam spot thickens by mass transport, radial stress builds, and the foil tears at the thick/thin transition — with electromigration bench experiments on carbon and aluminum strips, plus practical levers (large slowly-focused beam spot, larger foil diameter, even heating, a 10 ug/cm2 gold backing that saved a 2 ug/cm2 carbon foil). Friebel/Maier (Munich) build mercury targets as vacuum-sublimed HgS on LN2-cooled backings because the stable compound tolerates 20x the beam current of an amalgam, with a thermodynamic treatment of reductant choice (tungsten controllable, Zr/Th explosive). Minamisono & Ramsay make 100-150 mg/cm2 pressed-powder and single-crystal THICK targets (stop the beam in the target) with an RF-compatible split mounting ring. Maier-Komor (Munich) turns optical transmittance with a double-reflectance correction into a quantitative thickness gauge for 3-6 ug/cm2 foils, after showing gravimetry carries ~0.5 ug/cm2 adsorption error. Heagney (MicroMatter) catalogs hydrogen-furnace, reduction-distillation and electrolytic routes from oxide to rollable metal with a per-element temperature/boat table. The recorded DISCUSSION sessions are the richest seam: Perry (Chalk River) on rolling with a small bench mill (1-5 mg/cm2), pack materials, palladium anti-welding passes; Gursky on preventing film stress by substrate heating with a measured tensile-to-compressive crossover table (Ni ~210 C, Cu ~100 C, Fe ~300 C) and a proven substrate-temperature/parting-agent table for 15+ elements; Maier on cooling HgS targets in use through silver-painted edge contact to a -80 C copper block. Also: Stinson TiN reactive targets, Meens deuterated-Ti on thin backings (deuterated polyethylene deteriorates rapidly in beam), Adair large-area UO2/NpO2 vapor deposition with heated substrates and tared satellite plates, Stoner & Bashkin witness-slide thickness bookkeeping, Gallant selenium rolled warm under 80 C water.

    targetsfabricationmaterialsbeam-measurementvacuum

  62. Proceedings of the Sixth Annual Conference of the International Nuclear Target Development Society (LBL-7950)

    Gordon Steers, compiler (Lawrence Berkeley Laboratory); 23 papers, authors from ORNL, ANL, LBL, LLL, GSI Darmstadt, MPI Heidelberg, Munich, Frankfurt, Strasbourg, Manchester, Chalk River, NRC Canada, Indiana University Cyclotron Facility, Arizona · 1978 classic hands-on relevance 4 · hands-on 5 OSTI ↗ archived Apr 2026

    Proceedings of the 6th INTDS conference (Berkeley, Oct 19-21 1977) — the rolling-and-sputtering-rich volume of the INTDS seam. Beam damage is measured, not anecdotal: Thomas et al. (ANL) bombard 5 ug/cm2 carbon foils with 3-MeV Kr+ and show heating foil+frame to 450+-150 C buys ~4x lifetime, orbiting at 1 rpm ~3x, both together ~6x, with 60-second beam on/off cycling helping where 6-second cycling does not (stress relaxation time); Livingston, Berry & Thomas (reprinted from NIM 148) establish that carbon foil breakage time is independent of thickness (2-22 ug/cm2) and current, depends only on total ion fluence, and fit tau(p-uA-min/mm2) = A*E^1.15 (MeV/amu) with A~20 for Ar. Kellner & Maier-Komor (Munich) give the definitive pack-rolling paper: rolled foils outlive evaporated ones under heavy beams because of crystalline order; feedstock purified by e-beam melting with repeated impurity-stalagmite cutting; jackets of bright-annealed low-carbon (<0.03%) stainless <=0.5 mm; 3-10% reduction per pass, re-jacket at 2x elongation, double sandwich below 5-10 mg/cm2; anneal uranium 30 min at 1e-7 torr below 930 K; and the lesson that a 1e-5 torr scattering chamber oxidized their uranium foils to death in 1-2 h while 1e-6 torr (added cryopump) gave long life. Stinson (NRC) describes a complete DC reactive-sputtering rig (3 kV, 30 mA, ~80 um N2) producing "even, tough" water-coolable nitride targets for 10 uA alpha beams; Baumann & Wirth (Heidelberg/Frankfurt) replace the duoplasmatron with a 165-hour-stable Penning source for sputter deposition and measure >100 W/cm2 spot loading that forces cooling of the sputter-target post. Folger & Klemm (GSI) evaporate 0.1-100 mg/cm2 uranium sandwich targets with thin protective metal covers and thick copper-chip backings; Ellsworth (LBL) makes 3/4-inch self-supporting W cyclotron targets and finds tank pressure above 4e-6 torr embrittles them; Friebel et al. (Munich) tie chromium rollability to few-hundred-ppm impurity embrittlement and derive the 540-ppm water ceiling for hydrogen reduction from equilibrium data; Saettel (Strasbourg) shows electrodeposited platinum survives beam better than evaporated. Plus Lozowski (Indiana cyclotron) pressed-graphite 1-8 mg/cm2 foils, Stoner/Bashkin mounting a 4-inch carbon foil by draining water past a vertical frame, Rhoads optical-transmittance calibration for seven metals, Meens pinhole-free Pb via glow-discharge-leveled copper substrates, and Gursky & Sherwood hydriding titanium cones at ~650 C for a sputter ion source.

    targetsfabricationmaterialsbeam-measuremention-source

  63. Proceedings of Workshop 1983 of the International Nuclear Target Development Society (ANL/PHY-84-2)

    G. E. Thomas (ed.), Argonne National Laboratory Physics Division; 20 papers and discussion summaries by Pardo, Folger, Ford, Hinn, Tolfree, Maier, Janssens, Kobisk, Radford, Nardi & Worthington, McCulla, Tracy, Gursky, Alonso-Arias et al., Lozowski, Gallant, Dmytrenko, Yaraskavitch & Peng, Quinby, G. E. Thomas · 1984 classic hands-on relevance 4 · hands-on 5 OSTI ↗ archived Mar 2025

    Proceedings of the September 1983 INTDS workshop at Argonne (CONF-8309127, OSTI 6487125): the heavy-ion-era target-engineering volume, and this collection's best single source on target heat load and beam damage. Four invited machine papers (ATLAS, GSI UNILAC, HHIRF, Chalk River TASCC) frame what beams do to targets; Folger's GSI survey is the centerpiece — beam-power arithmetic (~208 W total, 1 kW/cm^2 focused, for 3e11/s of 17.5 MeV/u U), rotating target wheels phase-locked to the macropulse (666 rpm, ~1e17 particles integrated without damage), a disc that survived 1 uA of 15 MeV/u Au at 1333 rpm but melted when the drive motor stopped (SEM sequence), C/Pb/C sandwich targets, in-beam thickness/damage monitoring by scattering-peak width, plus GSI production statistics across rolling, carbon sublimation, focused-ion-beam sputtering, and evaporation. Three recorded discussion sessions (stripper foils; heavy-ion target problems; general targets) preserve floor-level practice: slackened-foil ~10x lifetime, overcoats that shunt heat and charge to the frame, Cu-overcoat protection of lithium, substrate heat-sinking. Contributed papers cover thick enriched-Si evaporation with a cooling/heating stress-control recipe (Hinn), O-ring foil stretchers (Radford), saddle-field sputter sources with measured rates (Thomas), stretched metallized polypropylene windows (Dmytrenko), self-supporting rare-earth films (Yaraskavitch), cellulose-membrane durable oxide targets (Quinby), CVD tungsten and a stripper-foil chain feeding a cyclotron dee stem (Gallant), storage-ring solid-target thickness limits (Lozowski), and a vacuum target-storage system (Nardi & Worthington).

    targetsfabricationmaterialsvacuumbeam-measurementdetectorscyclotron-general

  64. The Sparker, a Device to Overcome the Multipactor Difficulty in Starting the Oscillator of a Cyclotron

    H. W. Fulbright (Department of Physics and Astronomy, University of Rochester) · 1961 classic hands-on relevance 5 · hands-on 5 hosted

    Four-page report (dated January 3, 1961) on a spark-gap impulse starter that cures multipactor start-up failure on the Rochester 27" variable-energy cyclotron (10-20 Mc, self-excited oscillator, finished 1954 with no multipactor provision). States the problem exactly for self-excited machines: conventional cyclotrons driven from external oscillators with their own tank circuits suffer only slightly, "but in cyclotrons using a simple dee system as the tank circuit difficulties are encountered in getting the oscillator to break into full oscillation." Reviews the two conventional cures — biasing dee and dee stem by several kV (customary on FM cyclotrons), or driving the oscillator strongly from an external RF source so loading at order-100-V amplitudes cannot stall the rise — and why Rochester rejected biasing (too awkward on an already complicated variable-frequency mechanical design). The Sparker (added summer 1959): a small loop in the dee-stem tank, plane perpendicular to the tank axis, fired by an air spark gap from 500 pF charged through 700 kilohm off a 30 kV supply; each spark rings the loop at ~12 Mc (50% decay in ~3 cycles), shocking the dee to several hundred volts, above the multipactor band, from which the oscillator builds to full voltage unaided. Supply interlocked on only while oscillator power is on and dee voltage absent; gap set for ~2 sparks/s; one spark normally suffices. Includes the classic decay-envelope observation: with plate power off, spark-induced dee oscillations decay smoothly to ~1/3 maximum, drop steeply through the multipactor band, then decay slowly again.

    rfdeevacuumcyclotron-generalfabrication

  65. A Hooded Arc Ion Source with a Magnetic Mirror Feature

    H. W. Fulbright (Department of Physics and Astronomy, University of Rochester) · 1961 classic hands-on relevance 5 · hands-on 5 hosted

    Three-page report (dated January 4, 1961) on upgrading the hydrogen/deuterium hooded-arc filament source of the Rochester 27" variable-energy cyclotron with a passive magnetic mirror: a 1/8"-diameter steel bearing ball inserted at the upper end of the graphite arc hood. The field gradient near the ball reflects electrons moving up the arc channel; before the ball the hood top glowed bright orange from electron bombardment, afterward it stayed black. With electrons now oscillating between the mirror above and electrostatic repulsion from the filament below (reflex operation), the arc current needed for a satisfactory hydrogen ion yield dropped severalfold, filament life rose from a typical 15-30 hours to an intact-though-thin filament at 109 hours, arc stability improved, and tank pressure fell — helped by shrinking the hood extraction opening to ~1/32" x 3/16" (which then eroded larger in the direction of ion rotation within days). Operating envelope: 7,000-14,000 gauss; arc to 2 A and 250 V; deuterium runs on ~0.75 A at ~100 V; beam saturates between 1 and 2 A arc. The identical ball transplanted into a second source (filament plane parallel to B instead of perpendicular) failed — the mechanism was admittedly not well understood. Also documents the separate helium source (tantalum button on quartz atop a tantalum tubing hood, ~1/8" x 3/8" hole); the mirror source gave ~1/10 its alpha beam.

    ion-sourcemagnetfabricationvacuumcyclotron-general

  66. Magnets and Magnetic Measuring Techniques (TID-5215)

    R. K. Wakerling and A. Guthrie (eds.), Radiation Laboratory, University of California, Berkeley; chapters by Wilson M. Powell & Eneas Kane (1), John De Pangher, Wakerling & Guthrie (2), Wakerling (3), Wakerling & Guthrie (4) · 1949 classic hands-on relevance 5 · hands-on 5 hosted

    The declassified Berkeley calutron magnet volume (June 1949): four chapters covering the complete 1940s magnet-engineering cycle — design requirements, measurement instruments, scale-model testing, and full-scale acceptance. Chapter 1 (Powell & Kane) is a compact design course: Hp sizing, gap length <= half the orbit radius for shimmable fields, allowable field gradient derived from allowable flux-line bowing (0.16%/in), NI = 2.02*H*gap with 85-95% efficiency, the power-x-copper-weight invariant PW_c = 0.118(NI/1e5)^2(mean turn in.)^2, current-density/cooling limits, split-pole-face forces, and a worked two-tank design example ending in a scale model. Chapter 2 is the era's full metrology toolkit: ballistic galvanometer and fluxmeter theory with drift analysis (low-sensitivity meter + many-turn coil wins), search-coil area standards (single-layer solenoid good to 0.1%; mutual-inductance calibration to 0.05%), flux standards (0.35% RSS), bucking-coil uniformity technique that tolerates 1% supply drift, the 200:1 search/flip-coil contour-mapping trick with spark-through-paper recording (0.03% resolution), boxcar runs, iron-filing + direct-print stray-field records, and mercury-arc field-line visualization. Chapter 3 — the model-magnet treatment this collection lacked — reports 1/16-scale (and one 1/8-scale) models of every production magnet: same-steel/same-field linear scaling, the five standard model reports (saturation, efficiency, leakage, uniformity contours, stray field), flux audits by wound loops, end-coil optimization by two-point extrapolation (50% theoretical -> 59%/61.5%/55% measured), saturation red-lines (core 12 kG good, 17.2 kG with mu~150 "dangerously low"), force envelopes, and the twice-minimum gap-tolerance rule. Chapter 4 closes the loop on full-scale magnets: XA/37-in./60-in./plant race tracks, 71/71 tanks passing theoretical criteria (worst 2.8 cm vs 3.0 cm limit), full-scale performance slightly BETTER than model prediction, tank-ejection forces (9.71-ton energy-method estimate, tanks crept 2.5 in. in days), and acceptance testing collapsing to dimensional checks once the model-field-geometry chain was validated.

    magnetbeam-measurementcoilsmodelingfabrication

  67. The University of Washington 60 Inch Cyclotron: Progress and Status Report of Design and Construction

    Department of Physics, University of Washington (cyclotron project staff; Executive Officer list PDF p.119) · 1951 classic hands-on relevance 5 · hands-on 5 hosted

    First yearly AEC report (June 1951, contract AT(45-1)-293; project began June 1948 under State of Washington + ONR funding) on the UW 60-inch, 20-MeV-deuteron cyclotron — caught at the perfect moment: "an assembled machine ready for initial test," so every design decision is recorded before operating experience could smooth it over. The machine follows the Berkeley Crocker 60-inch from a complete set of plans supplied by E. O. Lawrence, with Navy Bureau of Ordnance machine tools and heavy supplier assistance — an explicit copy-a-proven-design strategy. Chapters: buildings (ravine siting for shielding; cyclotron in a 40-ft circular room with 10 ft of earth on the perimeter and 24 in of water above the ceiling); magnet (specified core steel chemistry, Rowland-ring verification from the same heat, a 1/12-scale model magnet program for shim design with its advantages/difficulties argued and its coil-support failure candidly reported, differential flip-coil field measurement, shim criteria with n = 0.4 at the 25-in exit radius, central spikes copied from the UC 184-inch news, azimuthal correction from 0.496% to 0.132% worst-case by using the field itself as the parallelism criterion, dip-needle median-surface survey); the heliarc- welded 2.5-in 61S-T4 aluminum vacuum tank (chosen for short activation half-life); vacuum system (4800 L, 20-in MC-7000 + MB-200 booster, double pump-out gaskets everywhere, weld leaks only at stainless-to-mild-steel joints, pump-down 1 hr); copper dees with spider shorting-bar tuning; hooded-arc ion source with filament and source vacuum locks; the RF chapter — a textbook self-excited grounded-grid oscillator design: two-mode (push-push vs push-pull) analysis, power budget from Q = 7500 and X = 40 ohms (21.2 kW at 160 kV; 150 kW max selected), Machlett ML 354, quarter-scale RF model at 4x frequency, booster oscillator (converted BC-677 radar transmitter driven at half frequency through a doubler so the main oscillator cannot feed back into it) to climb through electron-oscillation (multipactor) loading; controls chapter with the full interlock/gang-start/ready-light philosophy; deflector design deferred until an internal beam exists; costs to date ($642,000 total, $225,000 of it buildings); and a revised 5-22-51 full specification appendix.

    cyclotron-generalmagnetcoilsvacuumrfdeeion-sourcefabricationextractionbeam-measurementsealsmaterials

  68. The RCA 6949 as a Self-Excited Cyclotron Oscillator

    Bob H. Smith (Lawrence Radiation Laboratory, Berkeley) · 1960 classic hands-on relevance 5 · hands-on 5 hosted

    Eight text pages + Table I + 10 figures (October 25, 1960) on the Berkeley 88-inch spiral-ridge cyclotron's 300-kW self-excited oscillator — same author as this collection's UCRL-3153 and UCRL-3187. Frames cyclotron RF by its three differences from industrial RF: the resonator is a sparking load delivering joules per spark into the electronics, multipactoring, and the need to tune large power over a wide band (5.3-16.5 Mc here). Defines the self-excited class ("the resonator is the frequency-determining element of the system") and shows how its classic weaknesses are engineered out: anode and grid circuits designed as very-high-SWR transmission lines so voltage phase is 0 or pi everywhere and the grid stays 180 degrees out of phase with the anode across the whole band; a foreshortened half-wave grid line with fringing panels attached to the main tuning panels keeps grid drive constant as the machine tunes; a hard-tube modulator (Federal D-50) regulates dee voltage to 0.1%; servo trimmer + AFC holds frequency to 10 ppm. Resonator power budget (121 kW skin at 70 kV dee + ~30 kW stray-ion center loss + 60 kW beam at 1 mA/60 MeV + 10 kW misc = 221 kW, 300 kW provided), corrugated dee stem to cut current density (~70 kW saved), parasitic-mode discipline (adjust circuit so no higher mode lands on a class-C harmonic anywhere in the tuning range; harmonic amplitude falls ~1/n so only low orders matter — verified on a quarter-scale RF model), multipactor physics (~150 eV secondary threshold; dc sweeping-field cure), dee bake-in by letting the dee spark hundreds of thousands of times, 4.5 J stored energy and the spark-transient protection chain (vacuum switches 10 ms, hard-tube disconnect 10 us, rf-dc ratio interlock with 1-ms RC delay and ~1-s auto-recycle), tube ruggedness doctrine (heavy grid bars + massive copper shield tees on the 6949 vs squirrel-cage grids that spark-blast to grid-cathode shorts), and Table I: 15 kV / 25 A dc in, 319 kW out, 3 kW driving power.

    rfdeecyclotron-generalmatchingsafety

  69. Experimental Program with the Iowa State University Undergraduate 1.5 Mev Cyclotron

    Ronnie R. Burns · 1961 classic hands-on relevance 5 · hands-on 5 UNI ScholarWorks ↗

    Experimental program report for the Iowa State University 1.5 MeV undergraduate cyclotron, split between cyclotron-technology measurements and light-element nuclear physics, written by a senior undergraduate. The technology half maps beam resonance curves versus center field at target radii 6-11 cm (measured 150 gauss FWHM vs 115 gauss predicted at 9 cm), measures magnetic tune-down versus radius (0 to 70 gauss, converging with theory at large radii), tabulates the faster-than-predicted intensity fall-off with radius, and observes vertical beam extent via a phosphor-coated target. Instrumentation detail is strong - dual beam monitors (target microammeter plus Li7(p,gamma)Be8 reaction counting), NMR-calibrated field set to 4 gauss in 17,000, BC-221/WWV frequency transfer. The nuclear half runs Li7(p,gamma)Be8 gamma spectroscopy and C12(p,gamma)N13 activation with a half-life measurement (10.3 +/- 0.3 min vs published 10.1). Rights - Proc. Iowa Academy of Science 1961, renewal unverified, CITE-ONLY (quotes <=25 words); ScholarWorks record vol68/iss1/66.

    beam-measurementbeam-dynamicsmagnetdetectorstargetspedagogy

  70. Proton Orbit Calculations for the Iowa State University Cyclotron

    Alfred H. Mueller · 1961 classic hands-on relevance 5 · hands-on 3 UNI ScholarWorks ↗

    Companion theory paper to the Burns measurements - Rose-method phase-integral calculations of beam intensity and beam height for the ISU 1.5 MeV undergraduate cyclotron, by a senior undergraduate, using a field map obtained by numerically integrating a directly measured gradient. Derives phase lag versus radius, builds a phase-window relative-intensity model (intensity = surviving fraction of initial phases), and produces intensity-versus-tune-down curves per target radius; headline finding is that few-gauss field changes (in 17,000) can cause large intensity loss. Beam-height calculations show height is set almost entirely by the field-gradient ratio, insensitive to tune-down, shrinking roughly linearly with radius beyond 6 cm. Candid model-limitation discussion (phase grouping and z-dependent defocusing neglected; qualitative-plus-rough-quantitative fidelity claimed) plus point-by-point reconciliation with the measured discrepancies, and identification of the n = 0.2 coupling resonance at r = 10.1 cm. Rights - Proc. Iowa Academy of Science 1961, renewal unverified, CITE-ONLY (quotes <=25 words); ScholarWorks record vol68/iss1/67.

    beam-dynamicsmodelingmagnetphysics-theory

  71. Proton Orbits in a Small Cyclotron

    Ronald W. Moses Jr. · 1963 classic hands-on relevance 4 · hands-on 3 UNI ScholarWorks ↗

    Full numerical trajectory integration of proton motion in the ISU 1.5 MeV undergraduate cyclotron (Cyclone Computer, Runge-Kutta), written by a physics senior, explicitly designed to determine when simpler orbit approximations suffice. Builds the machinery still used in small orbit codes - analytic field fit (polynomial plus steep power law), median-plane Maxwell expansion Br = -z dB/dr, thin-gap energy kicks, apogee-start initial conditions with eight-phase axial sampling, event-based (not time-based) output - and validates each module against analytically solvable limits before use. Results - twin resonances at n = 0.2 (10.1 cm) and n = 0.25 (10.3 cm) only 0.2 cm apart drive axial amplitude blow-up and phase localization; a 0.5 cm centering error requires initial axial amplitude under 1/6.1 of dee height for guaranteed survival; maximum energy drops only about 3 percent for centering errors up to 1 cm. Verdict - trajectory integration is needed for resonant couplings, circular-orbit approximations suffice for electric-deceleration questions, and off-center orbits neither circularize nor deliver single-valued target energies. Rights - Proc. Iowa Academy of Science 1963, renewal unverified, CITE-ONLY (quotes <=25 words); ScholarWorks record vol70/iss1/67.

    modelingbeam-dynamicsmagnetphysics-theory

  72. X-Ray Emission from Cold-Cathode Gas Discharge Tubes Used for Educational Purposes (BRH/DEP 70-1)

    William S. Properzio, Ray C. Woodcock and Sidney D. Heidersdorf (X-ray Exposure Control Laboratory, Division of Electronic Products, Bureau of Radiological Health, U.S. Public Health Service, Rockville, Maryland) · 1970 classic hands-on relevance 5 · hands-on 5 hosted

    A Bureau of Radiological Health laboratory study (February 1970) of X-ray emission from the cold-cathode gas-discharge tubes then sold to schools. Three Muller-type cold-cathode X-ray tubes and nine kinds of demonstration tube (Crookes, Geissler, heat-effect, magnetic-effect, Maltese-cross and others) were run from a hand-held Tesla coil and from 3-inch and 6-inch induction coils. Operating voltage was estimated with a parallel spark gap and current with a series d-c milliammeter: about 25 kVp at 0.01-0.09 mA on the Tesla coil and 50-85 kVp at 0.03-0.20 mA on the coils. Exposure was mapped with LiF TLD rods calibrated against a G.E. Maximar 100 X-ray machine at matched kVp. The tubes gave up to about 217 R/h at 1 ft from the anode, and 240-281 R/h at 1 ft falling to 0.53-0.77 R/h at 16 ft in a separate distance series. Reverse polarity cut output by a factor of 50-100, and the hemisphere behind the anode was attenuated up to several hundredfold. Several tubes not meant to produce X-rays did so once their gas pressure fell, through getter action or ageing, and a field-checked Maltese-cross tube read 300 mR/h at 1 ft. Hot-cathode replacement tubes showed nothing on a CS-40A survey meter below 8 kV. The report concludes that X-ray output is sporadic and controlled by voltage, current, gas pressure and construction. Its 1970 recommendations include 10 mR/h at 1 ft through shielding and an 8 ft standoff from unshielded incidental emitters. Appendices cover spark-gap voltage measurement (the table is reprinted from the CRC Handbook) and an RF-shielded survey-meter bag.

    safetyshieldingdetectorsvacuum

  73. Medical X-Ray Protection Up to Three Million Volts (NBS Handbook 76; NCRP Report No. 26)

    National Committee on Radiation Protection and Measurements (NCRP Report No. 26), issued by the National Bureau of Standards, U.S. Department of Commerce · 1961 classic hands-on relevance 4 · hands-on 4 hosted

    The NCRP's 1961 recommendations for medical X-ray installations from diagnostic kilovoltages to 3 MV, issued as NBS Handbook 76 and superseding Handbook 60. The body gives definitions, among them a diagnostic-type housing that leaks no more than 100 mR in an hour at 1 m. It also covers installation planning, structural details of barriers (lead joints, door baffles), surveys, and requirements by installation type. Appendix A collects the design data. It gives distance-protection tables with design outputs K0 of 0.05, 0.1, 0.4, 2, 20 and 280 R/mA-min at 1 m for 50 kV to 2 MV. It gives measured average diagnostic output in R per 100 mA-s at 12-72 inches for 50-125 kVp at 2.5 mm Al, and dental output. It also gives the lead and brass needed to cut a beam to 5 percent, broad-beam HVLs in lead and concrete, HVL counts for leakage barriers, building-material densities and commercial lead-sheet weights. Appendix B tabulates complete barrier specifications for busy therapy installations, with a footnote that constant potential needs 15-25 percent more lead than pulsating potential. Appendix C states the method. Output at a given kV with minimum filtration is nearly constant in R/mA-min at 1 m, so a barrier follows from K = Pd^2/(WUT) read against transmission curves for lead and concrete (50 kV to 8 MV). Secondary barriers combine leakage HVLs and a 0.1 percent 90-degree scatter allowance, and the appendix includes a worked 100 kVp example. The permissible-dose values are the 1961 design values.

    shieldingsafetymaterialsfabrication

  74. General Safety Standard for Installations Using Non-Medical X-Ray and Sealed Gamma-Ray Sources, Energies up to 10 MeV (NBS Handbook 114; ANSI N543-1974)

    American National Standards Subcommittee N43-5, under the sponsorship of the National Bureau of Standards (ANSI Committee N43, Elmer H. Eisenhower, chairman) · 1975 classic hands-on relevance 4 · hands-on 4 NIST ↗

    The 1974 American National Standard for non-medical X-ray and sealed gamma-ray installations up to 10 MeV, issued in February 1975 as NBS Handbook 114. It revises Z54.1-1963 (NBS Handbook 93). Its core is four installation classes, each defined by a numeric exposure limit outside the enclosure. A Protective installation allows 0.5 mR in any hour at 5 cm from the enclosure and needs no outside occupancy limits. An Enclosed installation allows 10 mR/h at 30 cm in occupied areas and 100 mR/h in unoccupied areas, tested at any rated mA and kV in the worst orientation, with up to 4.3 HVL less shielding than Protective. The other two are an Unattended class (2 mR/h at 30 cm) and an Open class with posted perimeters. Supporting sections cover interlocks, warning signals, barrier joints, survey procedures, personnel monitoring and three-month instrument calibration. Appendix B treats gamma-source shielding. Appendix C defines a protective tube housing (at most 1 R in an hour at 1 m, averaged over 100 cm2) and gives distance-protection tables with K0 output per kV. It also gives an HVL/TVL table for lead, concrete and steel from 50 kV to 10 MV and for Cs-137, Co-60 and radium, credited to NCRP Report 34. Appendix D has industrial shielding tables, and Appendix E repeats the NBS Handbook 76 barrier method with transmission curves. Limits are the 1974-75 values.

    shieldingsafetyfabrication

  75. Radiation Safety for X-Ray Diffraction and Fluorescence Analysis Equipment (NBS Handbook 111; ANSI N43.2-1971)

    American National Standards Subcommittee N43-1 (Stanley Block, National Bureau of Standards, chairman; Floyd A. Mauer, secretary), published by the National Bureau of Standards · 1972 classic hands-on relevance 5 · hands-on 5 hosted

    The 1971 American National Standard for radiation safety of X-ray diffraction and fluorescence analysis equipment, published in June 1972 as NBS Handbook 111. These are 25-100 kVp tubes with intense, small, low-energy beams, the closest standards analogue to a compact high-voltage vacuum apparatus on a laboratory bench. It defines radiation, controlled and noncontrolled areas with their barriers and limits, and classifies systems as enclosed-beam or open-beam. General requirements include a limit of 10 mrem per week (0.25 mrem/h) at 5 cm from the generator cabinet for unwanted radiation from components such as high-voltage rectifiers. They include fail-safe X-RAYS ON indicators, and a beam-trap lead table (1.5-1.7 mm at 50 kVp, 5.6-5.9 mm at 70 kVp, 7.7-7.9 mm at 100 kVp, 5 cm from the focal spot, 20-160 mA). Open-beam systems need interlocked shutters and limits of 37.5 mrem/h to the hands and 2.5 mrem/h to the whole body. Enclosed-beam chambers must hold 0.25 mrem/h at 5 cm. Operating rules stress that most severe injuries occur during repair and alignment, and that lead parts must be mounted so they cannot cold-flow. The informative appendix describes the 5-100 keV continuum peaking at 20-30 keV and reported port rates of 4 x 10^5 R/min. It warns that gassy high-voltage rectifiers radiate at twice the tube potential. It also covers choosing thin-window ion chambers over Geiger counters for measurement, area corrections up to 6,000 for small beams, film and fluorescent-screen leak searching, calibration, and an Fe-55 check source.

    safetyshieldingdetectorsfabrication

  76. A Low Voltage Cathode Ray Oscillograph

    J. B. Johnson (no affiliation printed on the article; Bell System Technical Journal 1(2), Nov. 1922, pp. 142-153) · 1922 classic hands-on relevance 4 · hands-on 4 hosted

    The founding account of gas focusing of a low-voltage electron beam. Johnson describes a Braun-tube oscillograph that runs at 300-400 V from a Wehnelt (oxide-coated) thermionic cathode instead of a 10-50 kV cold-cathode discharge, and replaces magnetic focusing by a trace of gas: argon at a few thousandths of a millimetre of mercury shrinks a spot that would be 1 cm across in high vacuum to 1 mm. The paper explains the mechanism from the mobility difference of electrons and ions (slow positive ions accumulate in the beam and pull it inward), estimates the required radial field (about 1 V/cm for a 1 degree divergence at 2 x 10^-5 A, i.e. about four ions per beam electron) and confirms it with a crossed-beam experiment (about 3 V/cm). It shows that focal length shortens as beam current rises, so cathode temperature becomes the focus control; that the ion channel takes about a microsecond to form (a swept line stays sharp at 10^5 Hz and widens at 10^6 Hz); that heavy gases (N2, Ar, Hg) focus much more readily than H2 or He; and that the best argon pressure for that tube was 5 to 10 microns. Practical gun details follow: a shared electrode volume under 1 cm^3 to prevent arcing, a ring filament that lets back-streaming ions miss the emitter (about 200 h life), German-silver deflector plates, and a calcium-tungstate/zinc-silicate screen. A short, measured, hands-on paper on running an electron beam in gas near 1 Pa.

    space-chargebeam-dynamicsion-sourcevacuum

  77. Absolute Calibration of Dee Voltage by X-Ray Endpoint

    Peter Miller (Cyclotron Laboratory, Michigan State University, East Lansing, USA); Edwin Kashy (Cyclotron Laboratory, Michigan State University, East Lansing, USA) · 1975 classic hands-on relevance 4 · hands-on 5 JACoW ↗

    Paper C-08 of the 7th International Conference on Cyclotrons and their Applications (Zurich, 1975; Birkhauser, pp. 171-174), the original description of calibrating dee-voltage meters by the endpoint of the bremsstrahlung continuum from electrons accelerated across the dee gap, applied to the two weakly coupled dees of the Michigan State University cyclotron at 14.3-21.3 MHz. A Si(Li) detector viewed the dee region through a Plexiglass window; with only naturally emitted electrons the continuum was measurable above about 30 kV, the signal being lost in room-radioactivity background below that. To get controlled electron sources and avoid scattering distortion of the endpoint, two thoriated-tungsten filaments were installed under the dees (about 2 mA emission at 40 A), the window was thinned to 2 mm, and a remote brass-absorber wheel kept the counting rate below 2 kHz above about 40 kV; spectra down to 11.4 kV are shown. Energy calibration used 57Co, 241Am, Cu K and Au K lines. Endpoints were read by eye against an RF-off background (about one 0.639 keV channel; transit-time correction at most 0.2 %), one dee at a time, at ten frequencies; voltmeter calibrations were linear, mode-independent, with intercepts near +1 keV and slopes varying markedly with frequency. A turn-count formula checked the result within 4 %; the authors conclude absolute accuracy better than 4 %, probably 1-2 % above 30 kV, and +/-1 kV per endpoint.

    beam-measurementrfdetectorsdee

  78. Final Report, Part II, on Contract No. AT(11-1)-158: Development of the Modified Ohio State University Cyclotron

    H. J. Hausman (The Ohio State University Research Foundation, Columbus, Ohio) · 1954 classic hands-on relevance 4 · hands-on 5 hosted

    Part II of the Ohio State University Research Foundation's final report to the US Atomic Energy Commission on rebuilding the OSU cyclotron (submitted 2 June 1954). Part I (May 1953) described the modifications; this part reports commissioning and operating characteristics. Six typescript pages cover the vacuum system (an MCF-1400 fractionating diffusion pump on a movable carriage, helium leak testing, soldering leaks in a welded aluminium tank, 5-7e-6 mm Hg ultimate), the ion source, the self-excited push-pull oscillator with two 859 triodes and quarter-wave dee lines and its tuning procedure, dee-voltage pickup probes with a crystal rectifier (absolute calibration not yet done), and three beam-detection methods: a Geiger counter at first start-up, the insulated water-cooled target read on a microammeter (inflated by secondary emission), and target-water calorimetry calibrated with a 500 W immersion heater. The ion-source section is the core value for filament-source practice. It describes a low-voltage discharge in a small Elkonite cavity fed by a U-shaped tungsten filament, with a vacuum lock for filament changes. It states that the filament's position relative to the discharge-cone opening is critical and gives the procedure used to find it: slide the filament from outside the vacuum, put the target 8 in. from the source, hold field and dee voltage, and re-maximize beam with filament current and arc voltage at each position. The arc operating point was 160 A of filament current and 60-100 V. Gas-feed scans were blocked by gas-line lag. First deuteron beam was seen on 29 April 1954 at 8 in. radius, later followed to 12 in. The remaining pages are photographs and assembly drawings; the ion-source assembly drawing gives the .080-in. tungsten filament, the G-17 Elkonite hood and the water-cooled lead construction.

    ion-sourcebeam-measurementvacuumrf

  79. Filament Life in Low Pressure Arc Type Ion Source (ORNL-1758)

    O. C. Yonts (Stable Isotope Research and Production Division, Oak Ridge National Laboratory; LSU M.S. thesis work under J. R. McNally) · 1954 classic hands-on relevance 3 · hands-on 4 hosted

    An Oak Ridge report, based on the author's Louisiana State University M.S. thesis, on filament (cathode) erosion in the low-pressure arc ion sources of the ORNL calutrons used for stable-isotope separation. The standard cathode was a four-inch U of 145- or 170-mil tantalum heated by up to 500 A, with service lives from 15 to 200 h depending on the element processed. The report sorts failure into growths, alloying or chemical attack, and ion-bombardment erosion. It describes the arc source's operation (the collimated electron beam, the floating anode, the ion sheath at the filament) and gives a Child's-law argument that ion space-charge neutralization at the filament is what permits arc currents of amperes. It then documents the normal filament-arc-regulator control mode, in which arc current is held by trimming filament temperature. The experiments compare normal operation with 'diode-like' operation (series ballast resistor, low arc voltage, hotter filament) and 'modified diode' operation (arc voltage raised to 80-100 V by cooling the filament slightly). They ran first on a small 3-inch test spectrograph, then on a 24-inch production calutron with SiCl4, lithium and TiCl4 charges. Results: full diode operation minimized wear but roughly halved ion output; modified diode gave about normal output with at least twice the filament life; optimized 13-h runs weighed 95.5 versus 49.4 mg/h of filament loss. Filament temperatures were measured by optical pyrometry (1950-2150 °C). Erosion is tracked from filament-current decay and fitted as J/I = 0.36·P^(3/5) after Townes's sputtering law. The report also documents beam defocusing at high arc current and AC heating as a cure for J×B-driven alloy migration. Its Child's-law arithmetic contains an exponent slip.

    ion-sourcematerialscontrolsspace-charge

  80. Filament Life Extension in High-Intensity Ion Sources (ORNL-1525)

    O. C. Yonts (Isotope Analysis Methods Laboratory, Stable Isotope Research and Production Division, Oak Ridge National Laboratory) · 1953 classic hands-on relevance 3 · hands-on 4 hosted

    A short, typeset Oak Ridge report (six text pages) that first presented the 'diode-like' and 'modified diode' modes of running a hot-filament arc ion source, later expanded in ORNL-1758. Its introduction states that the normal operation of many arc-type sources, naming high-current calutron and cyclotron sources, controls the arc by changing filament temperature, so that arc voltage and current can be set independently. It contrasts this with gas-filled diode practice, where the arc drop sits near the gas ionization potential and filaments, including oxide-coated or thoriated tungsten, last a long time as long as ion energy stays below a critical value (22 V in mercury-vapour diodes). The equipment change was simple: turn the arc-current regulator's reference to maximum and put four 150 W incandescent lamps in parallel in series with the arc supply as a ballast. A preliminary iron run on the vapour-test magnet, at an arc drop of about 18 V, left the filament virtually free of erosion but evaporated, and output was halved. Seventeen silicon production runs (Table 2) and filament-current decay curves show modified diode operation, with arc voltage raised to 80-100 V by cooling the filament slightly, giving 2-3 times the filament life with no significant output loss. The life-versus-arc-power curves shift with the gas-baffle geometry. The author lists thoriated-tungsten or coated filaments in cyclotron sources running hydrogen or deuterium as untested future work. Small numerical differences from ORNL-1758 (diode voltage 45 vs 38 V; preliminary arc drop 18 vs 20 V) are noted in the rules.

    ion-sourcecontrolsmaterials

Timeless reference 50

Manuals, handbooks, datasheets, and textbooks that do not date: vacuum and RF engineering, magnet design, component data. Not about cyclotrons specifically, but the engineering a build draws on.

  1. BOC Edwards SI100 Diffusion Pump - Instruction Manual (B344-50-880 Issue B)

    BOC Edwards timeless reference relevance 5 · hands-on 5

    Full instruction manual for the Edwards SI100 air-cooled vapour diffusion pump (90 V and 180 V heater variants): technical data, installation, operation, and detailed maintenance including fluid changes and inlet-baffle/radiation-shield disassembly.

    vacuumseals

  2. Iron Dominated Electromagnets: Design, Fabrication, Assembly and Measurements (SLAC-R-754)

    Jack Tanabe (SLAC/USPAS) · 2005 timeless reference relevance 5 · hands-on 5 OSTI ↗ archived Aug 2026

    The USPAS conventional-magnet-design textbook, grown from Klaus Halbach's lecture tradition. Part one is theory and computation (2-D field theory, use of a magnet field code, magnetic measurement techniques); part two is thoroughly practical: component fabrication, coil winding, assembly, installation, alignment, and personnel/equipment protection, illustrated with real magnets from ALS, PEPII, and SPEAR3 with the design decisions rationalized.

    magnetcoilsfabricationmaterialsbeam-measurement

  3. Keithley Model 617 Programmable Electrometer - Instruction Manual

    Keithley Instruments timeless reference relevance 5 · hands-on 5 publisher ↗ archived Oct 2025

    Full instruction manual for the Keithley 617 programmable electrometer, containing complete operating instructions (volts, amps, ohms, coulombs, V-source), measurement technique/error discussion, IEEE-488 programming, performance verification, and servicing/calibration information.

    beam-measurementdetectors

  4. Parker O-Ring Handbook - Design Chart 4-3: O-Ring Face Seal Glands

    Parker Hannifin O-Ring Division timeless reference relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    Single extracted page from the Parker O-Ring Handbook giving the complete dimensional design chart for static face-seal glands: gland depth, squeeze, groove width (separate columns for vacuum vs liquid service), groove radius, and surface finish for every standard O-ring cross section.

    sealsvacuumfabrication

  5. Rutgers 12 Inch Cyclotron Ion Source Studies: Part I

    Timothy W. Koeth (Rutgers University) · 2006 timeless reference relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    Working note on diagnosing and fixing the Rutgers cyclotron's low beam current (<10 nA, goal 1 uA). Traces the problem to meager ion production rather than RF or focusing, drawing on advice from MSU and DESY operators, computes turn spacing (0.04 in at r=4 in, 10 kV Vpp, 1 T) to show the shielded ion collector was masking inner-radius beam, and documents the design of a chimney over the ion source (following R.R. Wilson's 1939 source concept) to localize ion production at the optimal position and RF phase.

    ion-sourcedeebeam-dynamicsbeam-measurementfabricationcyclotron-general

  6. Sorensen DCS 55-55 M62 DC Power Supply Manual

    Sorensen timeless reference relevance 5 · hands-on 5

    Operation and service manual for the Sorensen DCS 55-55 (0-55 V, 0-55 A, ~3 kW) switching DC power supply, including installation, front-panel and remote analog programming, and calibration.

    magnetcoils

  7. Theoretical Calculations and Measurements of the DEE Voltage in the Rutgers 12 Inch Cyclotron

    Timothy W. Koeth (Rutgers University) · 2005 timeless reference relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    Student-oriented working note deriving the expected peak dee voltage of the Rutgers 12-inch cyclotron and validating it by measurement. Models the dee as a lumped capacitance (parallel-plate estimate 77.5 pF vs 78.1 pF measured on an L-C meter) in an L-C tank, works through Q, series resistance, mutual inductance, and critical coupling, then calibrates a capacitive chamber pickup against a Tektronix P6015 HV probe so dee voltage can be tracked at powers beyond direct-probe limits.

    deerfmatchingbeam-measurementcyclotron-general

  8. A User's Guide to Vacuum Technology, Third Edition

    John F. O'Hanlon (University of Arizona) · 2003 timeless reference relevance 5 · hands-on 4 DOI ↗

    The standard practical vacuum reference for system users rather than designers of pumps: gas flow regimes, outgassing and gas release from solids, pressure gauges, flow meters, RGAs and interpretation of RGA spectra, all pump families (mechanical, diffusion, turbo, cryo, ion, getter), materials, and complete system design grouped by application. Written explicitly for the student/technician/engineer who must operate, troubleshoot, and specify vacuum equipment.

    vacuumsealsmaterialsfabricationchamber

  9. AD-25-500 Alpha Particle Detector

    AlexDetector (scintillators.ru) timeless reference relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Datasheet for the AD-25-500 silicon alpha-particle detector: 500 mm2 active area, 40-60 V operating bias, ~1% energy resolution at 5.48 MeV (Am-241). Includes handling warnings (never touch the active area) and OEM purchase terms.

    detectorsbeam-measurement

  10. Apple Rubber Products Seal Design Guide

    Apple Rubber Products, Inc. timeless reference relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Vendor engineering handbook (first published 1989, this is a later consolidated edition) covering O-ring fundamentals, static and dynamic gland design with full dimensional tables, operating environment factors, elastomer material selection, special applications, and a seal-failure troubleshooting section. Includes AS-568 size tables and gland detail drawings with surface-finish callouts.

    sealsvacuummaterialsfabrication

  11. Granville-Phillips Series 354 Micro-Ion Vacuum Gauge Module with Analog Output - Instruction Manual (354004 Rev E)

    MKS Instruments / Granville-Phillips · 2017 timeless reference relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Instruction manual for the GP 354 Micro-Ion hot-cathode ionization gauge module with analog output: installation, operation, degas, overpressure shutdown, specifications, and troubleshooting.

    vacuum

  12. Keithley Model 617 Programmable Electrometer - Quick Reference Guide

    Keithley Instruments · 1984 timeless reference relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Condensed quick-reference guide for the Keithley 617 programmable electrometer: abbreviated specifications, front-panel feature descriptions, and IEEE-488 bus programming with example programs for period controllers (HP-85, IBM PC, Apple II, etc.).

    beam-measurementdetectors

  13. O-Ring Vacuum Sealing (Catalog 5705B)

    Parker Hannifin Corporation, O-Ring Division · 1998 timeless reference relevance 5 · hands-on 4 publisher ↗ archived Jan 2026

    Parker's dedicated vacuum-sealing guide: how elastomer seals behave in vacuum service, covering permeation and outgassing of compounds, leak rate estimation, compound selection, and gland design adjustments specific to vacuum (higher squeeze, finer surface finish, reduced groove volume).

    sealsvacuummaterialsfabrication

  14. Sorensen/AMETEK DCS-E 3kW Series DC Power Supplies - Operation Manual (M362295-01 Rev C)

    AMETEK Programmable Power (Sorensen/Elgar) timeless reference relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Operation manual for the Sorensen DCS-E 3 kW programmable DC power supply family (DCS8-350E through DCS150-20E), covering installation, front-panel and remote analog programming, and calibration.

    magnetcoils

  15. Exhaust Filter for Harbor Freight Oil Vacuum Pump

    unknown (hobbyist write-up) timeless reference relevance 4 · hands-on 5 publisher ↗ archived Aug 2026

    Hobbyist how-to for building a ~$45 oil-mist exhaust filter for a Harbor Freight rotary-vane vacuum pump from PVC fittings, a wound water filter cartridge, and Filtrete 1900 furnace filter fabric. Reports 18 months of service with complete mist capture and oil drain-back to the pump.

    vacuumsafetyfabrication

  16. Fastenal Technical Reference Guide (Rev. 9)

    Fastenal Company Engineering Department · 2005 timeless reference relevance 4 · hands-on 4 archive ↗

    Comprehensive fastener engineering guide covering material selection, mechanical properties, galling, heat treatment, thread fundamentals and strength, platings and corrosion, hydrogen embrittlement, joint design, and the torque-tension relationship with control methods (torque, turn, stretch, direct tension). Appendix includes torque tables and standards cross-references.

    fastenersmaterialsfabrication

  17. Granville-Phillips Series 275 Mini-Convectron Module with Nonlinear Analog Outputs and Process Control Relays - Instruction Manual (275512 Rev D)

    MKS Instruments / Granville-Phillips · 2016 timeless reference relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Instruction manual for the GP 275 Mini-Convectron convection-Pirani gauge module with nonlinear analog output and setpoint relays, covering installation for all fitting types, operation, analog output curves, and troubleshooting.

    vacuum

  18. Handbook of Ion Sources

    Bernhard Wolf (ed.), GSI Darmstadt · 1995 timeless reference relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    CRC engineering handbook cataloguing essentially every practical ion source family (Penning/PIG, duoplasmatron, RF, microwave/ECR, surface, sputter, vacuum arc, etc.) with operating parameters, extraction system design, beam formation and transport, and supporting technology (power supplies, insulation, diagnostics). Compiled as a working reference with comparative data tables rather than theory.

    ion-sourcerfvacuumbeam-measurement

  19. LDG AT-200ProII 200 W Automatic Antenna Tuner - Operations Manual (Rev B)

    LDG Electronics timeless reference relevance 4 · hands-on 4 publisher ↗ archived Feb 2026

    Operations manual for the LDG AT-200ProII 200 W automatic LC antenna tuner: installation, automatic/memory/manual tuning, manual inductor-capacitor adjustment, high/low-Z relay setting, and a theory-of-operation chapter on impedance matching.

    rfmatching

  20. LOCTITE Hysol 1C Epoxy Technical Data Sheet

    Henkel / Loctite · 2007 timeless reference relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    TDS for Hysol 1C two-part epoxy: mix ratio 100:44 by weight (2.5:1 by volume), room-temperature cure with optional heat cure, machinable, high service temperature, and low outgassing.

    materialssealsvacuumfabrication

  21. MKS/HPS 901P Loadlock Vacuum Pressure Transducer - Operation and Installation Manual (Rev C)

    MKS Instruments (HPS Products) · 2009 timeless reference relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Operation and installation manual for the MKS 901P combined MicroPirani/piezo loadlock vacuum transducer, covering mechanical and electrical installation, the RS-232/485 serial protocol, setpoint relays, and calibration.

    vacuumbeam-measurement

  22. Parker Series 20 & 30 Metering Valves

    Parker Hannifin timeless reference relevance 4 · hands-on 4

    Two-page datasheet for Parker Series 20/30 fine metering (needle) valves: brass or 316 SS, 1000 psig max, vernier knob option, with flow-coefficient vs turns-open curves and air/water flow data.

    ion-sourcevacuummaterials

  23. Torque Values for Stainless Steel and Non-Ferrous Fasteners

    Fastenal Company · 2009 timeless reference relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    One-page lab-tested maximum torque table for 18-8 and 316 stainless (dry and lubricated), silicon bronze, Monel, brass, and 2024-T4 aluminum fasteners, from #2-56 through 1-1/2 in., in inch-pounds and foot-pounds.

    fastenersmaterials

  24. Inertial Electrostatic Confinement (IEC) Fusion: Fundamentals and Applications

    George H. Miley and S. Krupakar Murali (Springer) · 2014 timeless reference relevance 4 · hands-on 3 DOI ↗ archived Aug 2026

    The standard reference book on IEC fusion, spanning history (Farnsworth, Hirsch), potential-well theory, gas discharges in gridded devices, and - notably for builders - dedicated chapters on high-voltage stalk design, grid materials and construction, grid geometry effects, space-charge limited flow, cylindrical geometries, and applications (neutron activation analysis, medical isotopes, propulsion). Explicitly written to support university and amateur fusor experiments.

    iec-fusorfusionion-sourcevacuumdetectorsmaterialsfabricationphysics-theoryshielding

  25. Kimball Physics ES-020 Tungsten Hairpin Filament - Specifications

    Kimball Physics timeless reference relevance 4 · hands-on 3

    One-page datasheet for the Kimball Physics ES-020 tungsten (W-3%Re) hairpin thermionic filament on an AEI glass base, with full emission and operating specifications.

    ion-sourcematerials

  26. Principles of Charged Particle Acceleration

    Stanley Humphries, Jr. (University of New Mexico) · 1986 timeless reference relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    Humphries' comprehensive single-particle accelerator text (Wiley 1986, free author PDF), written from an experimentalist's building-block viewpoint. Covers charged-particle dynamics, field modification by materials and magnetic circuits, electric and magnetic lenses (aperture, immersion, solenoid, sector, edge focusing, quadrupole), transfer matrices, and the full menagerie of machines including betatrons, cyclotrons, and RF accelerators, with complete derivations and essential formulas.

    beam-dynamicsmagnetrfaccelerator-othercyclotron-generalphysics-theory

  27. Edwards SI100 Diffusion Pump - Specification Summary (Island Scientific)

    Island Scientific Ltd / Edwards timeless reference relevance 4 · hands-on 2 publisher ↗ archived Aug 2026

    One-page reseller specification summary for the Edwards SI100 air-cooled vapour diffusion pump: 100 l/s, ISO100 inlet, KF16 backing, 20 ml Santovac 5 fluid charge.

    vacuumvendor

  28. Nuclear Physics Constants for Thermonuclear Fusion: A Reference Handbook (INDC(CCP)-326/L+F)

    S.N. Abramovich, B.Ya. Guzhovskij, V.A. Zherebtsov, A.G. Zvenigorodskij (USSR, IAEA translation) · 1991 timeless reference relevance 4 · hands-on 1 publisher ↗ archived Aug 2026

    Soviet evaluated-data handbook (1989, IAEA English translation 1991) of reaction and scattering cross sections for hydrogen and helium isotopes on nuclei with Z<=5, covering all the major fusion fuel cycles including 11B+p. Data are given as fitted polynomial coefficients for reliable interpolation, plus astrophysical S-factors and reaction Q-values for exo- and endo-energetic channels.

    fusionboron-11physics-theorytargets

  29. Copper Tube Handbook: Industry Standard Guide for the Design and Installation of Copper Piping Systems

    Copper Development Association · 2010 timeless reference relevance 3 · hands-on 5

    Trade handbook on copper tube types (K/L/M/ACR/DWV), dimensional and pressure rating tables, and joining methods: soldering, brazing, flare and mechanical joints, with detailed procedures, fitting data, bending, and support practice. Application chapters cover plumbing, medical gas, and solar, but the enduring value is the joining technique and tube property data.

    fabricationmaterialsseals

  30. The Right Seal: Your Guide to Sealing in Semiconductor Processing (Release 3.0)

    Greene, Tweed & Co. timeless reference relevance 3 · hands-on 3

    Greene Tweed handbook on elastomer sealing for semiconductor process equipment: compound selection for plasma, CVD, and wet chemistry environments, perfluoroelastomer behavior, FEA of seal deformation, and complete gland dimension tables for rod, piston, and face seals in Chapter 5. Oriented to high-purity vacuum/plasma chambers, which overlap strongly with accelerator chamber conditions.

    sealsvacuummaterialsfabrication

  31. Pure Gases: Hydrogen - Gas Data and Cylinder Specifications

    industrial gas supplier catalog (unattributed) timeless reference relevance 3 · hands-on 2

    Catalog data sheet for pure hydrogen: physical gas data, flammability limits, DOT/TC shipping classifications, cylinder sizes/pressures with CGA valve outlet numbers, and purity grades.

    ion-sourcesafetyvendor

  32. 100BGQ100 / 100BGQ100J 100 A Schottky Rectifier

    International Rectifier · 2002 timeless reference relevance 2 · hands-on 3

    Datasheet for a 100 A, 100 V Schottky rectifier diode (VF 0.74 V, 175 C junction) intended for switching supplies and reverse-battery protection.

    magnetrffabrication

  33. Physics for Scientists and Engineers, 6th Edition

    Raymond A. Serway, John W. Jewett · 2004 timeless reference relevance 2 · hands-on 0

    Standard calculus-based introductory university physics textbook covering mechanics, thermodynamics, electricity and magnetism, optics, and modern physics, with worked examples and problem sets. General background reference only; contains the usual textbook treatments of charged-particle motion in magnetic fields, capacitance, inductance, and AC circuits.

    physics-theory

  34. Injection and Extraction for Cyclotrons

    Pauli Heikkinen (Univ. of Jyvaskyla) · 1994 timeless reference relevance 4 · hands-on 2 DOI ↗ archived Aug 2026

    CAS lecture (CERN 94-01 Vol II, printed pp. 819-839) surveying both injection (inflectors: mirror, spiral, hyperboloid) and every major extraction scheme: stripping, extraction by acceleration, brute-force first-harmonic, precessional (nu_r=1), regenerative (nu_r=2/2), and non-linear resonances. Gives the working formulas for radial gain per turn, coherent amplitude from resonance crossing, and a table of vertical-motion resonances that endanger extraction.

    extractionbeam-dynamicscyclotron-general

  35. Extraction from Cyclotrons

    J.I.M. Botman and H.L. Hagedoorn (Eindhoven Univ. of Technology) · 1996 timeless reference relevance 5 · hands-on 3 DOI ↗ archived Aug 2026

    CAS lecture that is the single most useful extraction tutorial in this archive: derives the three-term turn-separation equation (acceleration + amplitude growth + precession), orbit-centre formalism, first-harmonic bump response, HF phase mixing, multi- vs single-turn extraction, and hardware rules (septum, deflector field limits, magnetic channels) with worked numeric examples throughout.

    extractionbeam-dynamicscyclotron-general

  36. Cyclotrons: Magnetic Design and Beam Dynamics (CAS 2015 proceedings, arXiv:1804.08961)

    W. Kleeven and S. Zaremba (IBA) · 2018 timeless reference relevance 4 · hands-on 3 arXiv ↗ archived Aug 2026

    63-page review from IBA's chief physicists covering magnet design, isochronism, focusing, central region, injection, and a full extraction chapter (Section 4, pp. 41-52): internal targets, stripping, ESD+septum, turn-separation mechanisms, precessional and regenerative extraction, gradient correctors, and the IBA self-extracting cyclotron. Industrial viewpoint, minimal formalism, superbly illustrated with real hardware.

    extractionmagnetbeam-dynamicscyclotron-generalrf

  37. Betatron Tune Characterization of the Rutgers 12-Inch Cyclotron for Different Magnetic Poles Configurations

    Cédric Hernalsteens, Timothy S. Ponter (Ion Beam Applications, Louvain-la-neuve, Belgium; Hernalsteens also at CERN, CH-1211 Geneva and École Polytechnique Fédérale de Lausanne, LPAP - CH-1015 Lausanne); Brian Beaudoin, Timothy W. Koeth, Kiersten Ruisard (University of Maryland, College Park, Maryland, USA); Michelle Miller (Brown University, Providence, Rhode Island, USA) · 2016 timeless reference relevance 5 · hands-on 4 NPL ↗

    A four-page conference-style paper reporting the first beam-based betatron tune measurements on the Rutgers 12-Inch, 1.2 MeV proton cyclotron for two pole-tip configurations. The magnet itself has flat poles reaching about 1 T, with interchangeable pole-tips carrying all the field shaping, so weak focusing, radial-sector (Thomas) and spiral-sector configurations can be swapped on one machine. Radial-sector tips were built but the beam could not reach the deflector radius because of poor isochronicity, so a 270-degree Archimedean four-fold spiral set was designed by iterating a field solver with ion tracking. The diagnostic is a phosphor screen on a manual radial probe photographed through a viewport with a DSLR at up to 5 second exposure, calibrated per data set, giving simultaneous vertical and radial turn-by-turn information; a purpose-built chimney with a vertically offset aperture provides the initial axial offset that excites the oscillation. Centroid and envelope signals were extracted and fitted with a 5-point moving-window harmonic fit over roughly 15 turns of signal. Measured weak-focusing axial tune, nu_a = (0.086 ± 0.001) + (0.0012 ± 0.001)(r − 45) mm, agrees with the magnetic-map prediction (0.088 ± 0.004) + (0.0015 ± 0.0002)(r − 45), and the envelope-beating tune (twice the betatron frequency) independently confirms the spiral-sector result. Note: the PDF carries no printed conference name or date line; the file was typeset 2016-04-20 per its pdfTeX metadata and its most recent cited reference is Cyclotrons 2013, so the year here is the typesetting year and should be treated as approximate.

    beam-dynamicsbeam-measurementmagnetion-sourcedetectorsmodelingpedagogy

  38. A NOVEL OPTICAL METHOD FOR MEASURING BEAM PHASE AND WIDTH IN THE RUTGERS 12-INCH CYCLOTRON

    J. Gonski, S. Burcher, S. Lazarov, J. Krutzler (Rutgers University, New Brunswick, NJ 08901, USA); T. Koeth, B. Beaudoin (University of Maryland, College Park, MD 20740, USA) · 2013 timeless reference relevance 4 · hands-on 5 JACoW ↗

    A method paper solving a problem every small cyclotron has: the residual RF field near the accelerating gaps makes conventional electronic bunch-length and beam-phase measurement impossible, so a decade of Rutgers work had been purely transverse. The authors substitute an optical measurement that the RF cannot disturb — a 0.944-inch ZnO:Ga "fast" phosphor with a 3 ns 1/e decay, deposited between a 0.050 inch quartz substrate and a 1000 angstrom aluminium coating, carried on the existing radial probe and viewed through a viewport by a Princeton Instruments PI-MAX 2 gated ICCD capable of 3 ns exposures. Stepping the gate in 3 ns increments across a single RF period builds a time-sliced longitudinal profile of the beam. The machine ran at 7.800 MHz (chosen to stretch the RF period against the camera's fixed 3 ns resolution) with fields near 0.5 T, RF pulsed at 20 Hz so instantaneous dee voltage could be high without the average heat load; 44 time steps at 900 integrations each meant over half an hour per run. The plate intercepted only part of the beam, producing two peaks per RF cycle from adjacent turns — an accident the authors exploited as a direct turn-to-turn phase-shift measurement, then deconvoluted with a dual-Gaussian fit. Bunch length fell from 38 to 20 degrees as the field rose from 0.498 to 0.566 T, and relative phase shift varied linearly with field as SIMION (fed Poisson Superfish field maps) had predicted, though absolute agreement was not achieved. The improvements section is unusually candid: a bigger plate, thinner or bypassed aluminium backing, a closer camera, and better RF cooling for CW operation. The text carries several typographical errors ("acrue", "decreseases", "blow 90 degrees", "demostration").

    beam-measurementdetectorsrfbeam-dynamicsmodeling

  39. BEAM PHYSICS DEMONSTRATIONS WITH THE RUTGERS 12-INCH CYCLOTRON

    Timothy W. Koeth (IREAP, University of Maryland, College Park, MD, 20742, U.S.A.) · 2013 timeless reference relevance 5 · hands-on 4 JACoW ↗ archived Aug 2026

    The pedagogy-and-beam-dynamics paper of the set, and the best single reference for what a 12-inch cyclotron can actually be made to show. It opens with the fullest machine description in the collection: 12-inch H-frame poles at approximately a 2-inch gap, removable pole tips up to 1 inch thick in four interchangeable sets (a "good" and an intentionally "bad" weak-focusing pair, a radial-sector AVF and a spiral-sector AVF) all reaching 1.2 T on axis, independently energized upper and lower coils for deliberate median-plane shifts, a single 5-inch radius dee with a 0.9 inch vertical aperture against a dummy dee, RF tunable 2-30 MHz at up to 1.5 kW and 10 kV peak, an internal cold-cathode PIG lasting over 40 hours, a phosphor-plate radial probe that also reads current, a removable electrostatic deflector at the 4-inch radius, 1E-5 Torr from a standard 4-inch diffusion pump stack, and a horizontally movable chamber. It then works through the demonstrations: weak-focusing theory (n = -(r/B)dB/dr, nu_z = sqrt(n), nu_x = sqrt(1-n), stability for 0 < n < 1 with n = 0.2, 0.36 and 0.5 excluded by coupling resonances), axial betatron motion excited by a vertical kick at the chimney and photographed by dragging a phosphor plate under long exposure, a student procedure for extracting the local tune from the image (with peak dee voltage used to count unresolved turns), radial betatron motion introduced by offsetting the chamber and the resulting turn-separation exploited historically for septum extraction, a deliberately destructive n = 0.2 resonance built into the "bad" pole tips (n = 0.2 at r = 3.5 inches, needing a 3 mm chamber-magnet offset to reach the observed amplitudes), and vertical steering by unbalancing the coils at 17/12, 14.5/14.5 and 12/17 amps. Every demonstration is shown as a matched simulation-and-photograph pair. The author states the machine is not a radiological hazard and is approachable while operating at its 1.2 MeV ceiling; that is his characterization of his own machine, with no dose data or licensing basis given in the paper.

    beam-dynamicspedagogymagnetbeam-measurementphysics-theory

  40. Atomic Data for Fusion, Volume 1: Collisions of H, H2, He and Li Atoms and Ions with Atoms and Molecules (ORNL-6086/V1)

    C. F. Barnett (Oak Ridge National Laboratory); H. T. Hunter and M. I. Kirkpatrick (series technical editors, Controlled Fusion Atomic Data Center, ORNL); I. Alvarez and C. Cisneros (University of Mexico), R. A. Phaneuf (contributing editors) · 1990 timeless reference relevance 3 · hands-on 2 OSTI ↗

    The ORNL Controlled Fusion Atomic Data Center "Red Book" (July 1990), the evaluated handbook of recommended cross sections and rate coefficients for inelastic collisions of hydrogen, helium and lithium atoms, molecules and ions with H, H2, He and Li targets. The introduction gives 383 reactions (the abstract says more than 400), drawn from literature available as of September 1988 and digitised from original tables or figures (digitiser rms uncertainty stated as under 2%). The recommendations rest almost exclusively on experiment, with theory used to extend energy ranges or fill gaps. Reactions are grouped in eight chapters: A total electron capture, B capture into excited states, C excitation and spectral-line emission, D ionization and charge production, E electron loss (stripping), F electron detachment, G dissociation of molecules and molecular ions, H particle-interchange reactions. Each reaction occupies a standard page set: a table of energy (eV/amu), velocity and cross section (cm^2); a reference list; an "Accuracy" line giving the estimated uncertainty (sometimes split by energy range, sometimes "unknown"); notes on discrepancies; least-squares Chebyshev fitting parameters with the fit's rms and maximum deviation; and a log-log graph. Where fusion-relevant, Maxwellian and beam-Maxwellian rate-coefficient tables follow, flagged * (possible error >10%) or ** (>100%). The compilers describe their accuracy estimates as conservative upper limits. For a cyclotron the directly useful pages are the proton and H2+ charge-capture and destruction cross sections in H2, the ingredients of a residual-gas beam-loss estimate; energies run from a few eV/amu to MeV/amu depending on the reaction. Appendices give Chebyshev evaluation formulas with a sample BASIC program, the ALADDIN data format, and atomic-physics conversion units.

    physics-theoryvacuumion-sourcebeam-dynamics

  41. Cross Sections and Swarm Coefficients for H+, H2+, H3+, H, H2, and H- in H2 for Energies from 0.1 eV to 10 keV

    A. V. Phelps (Joint Institute for Laboratory Astrophysics, University of Colorado and National Institute of Standards and Technology, Boulder, Colorado) · 1990 timeless reference relevance 3 · hands-on 2 DOI ↗

    A critical compilation (J. Phys. Chem. Ref. Data 19, 653) of recommended cross sections for collisions of H+, H2+, H3+, H, H2 and H- with H2 over laboratory projectile energies of 0.1 eV to 10 keV, assembled to give the "complete" sets needed for modelling weakly ionised H2 discharges (breakdown, cathode fall, thyratrons, ion sources, pseudosparks). For each projectile it gives a log-log figure and a table on a common logarithmic energy grid (units 10^-20 m^2), covering as applicable momentum transfer, rotational and vibrational excitation, charge transfer, H3+ formation, dissociation, Lyman-alpha and Balmer-alpha excitation and electron production; there are no analytic fits. From these it derives energy- and momentum-loss functions and, with a single-beam momentum-balance model, drift velocities, destruction cross sections and runaway thresholds versus E/n, compared with swarm measurements. Energies are laboratory energies of the whole projectile, not per amu. The author states that no accuracy estimates were assigned, that all table entries should be treated as uncertain by at least +/-5%, and marks extrapolations and interpolations as short-dashed curves. Findings the author highlights include: H3+ formation dominates H2+ + H2 below a few eV, charge transfer dominating above ~10 eV; for H+ in H2 the energy-loss function from the cross-section set is a factor of about 5 below stopping-power theory at 1 keV, with ionization smaller than earlier estimates; H+ runaway is predicted above ~700 Td; and H3+ + H2 data between 1 eV and 1 keV are described as urgently needed. For a cyclotron, Tables 1, 4 and 6 give the low-energy H+, H2+ and H3+ loss channels in hydrogen relevant to the ion source, extraction gap and first turns; above 10 keV other compilations are required. An erratum appeared in J. Phys. Chem. Ref. Data 20, 1339 (1991).

    physics-theoryion-sourcevacuumbeam-dynamics

  42. Handbook of Mammographic X-Ray Spectra (HEW Publication (FDA) 79-8071)

    Thomas R. Fewell and Ralph E. Shuping (Division of Electronic Products, Bureau of Radiological Health, Food and Drug Administration, Rockville, Maryland) · 1978 timeless reference relevance 3 · hands-on 3 hosted

    A Bureau of Radiological Health compendium (October 1978) of measured and corrected X-ray spectra from three conventional mammographic tubes, plus a special-purpose RSI unit. The three tubes are a Machlett Dynamax 69M tungsten-anode tube, a Dynamax M64 molybdenum-anode tube and a GE MMX-2 Mo-W alloy tube with a beryllium window. All were driven by a GE MSI-1250 II generator approximating constant potential (4-6 percent ripple) at 20-60 kVp and measured with an intrinsic-germanium spectrometer. Before the spectra, the handbook gives the two things a shielding designer needs. First, exposure-rate curves in mR/mAs at 1 m versus kVp for several aluminium and molybdenum filtrations (Figs 6-9). Second, a 30 kVp comparison table (Mo 3.92, Mo-W 9.26, W 2.84, RSI 5.83 mR/mAs at 77 cm, with HVLs of 0.41-0.60 mm Al). It explains why exposure (mR) favours soft photons, and it records that at low tube currents leakage current corrupted the mAs measurement. On the RSI unit, mR/mAs rose threefold between 0.4 and 4 mA, so the output data were taken at high current. It describes narrow-beam HVL measurement and K-escape correction of germanium spectra. Each tabulated spectrum carries kVp, added filtration, HVL and a normalisation factor that converts it to photon fluence per mR. The authors state that these let an experimenter reproduce a spectrum from measured kVp, filtration and HVL. The spectra tables themselves (primary, exit through Lucite phantoms, and RSI) fill PDF pages 28-111.

    safetydetectorsshieldingphysics-theory

  43. Radiological Health Handbook, Revised Edition (January 1970)

    Compiled and edited by the Bureau of Radiological Health and the Training Institute, Environmental Control Administration, U.S. Public Health Service (revision led by John E. Munzer and Ralph E. Bunge of the training staff) · 1970 timeless reference relevance 4 · hands-on 4 UNT Digital Library ↗

    The Public Health Service's standard radiological-health reference, the 1970 revised edition, scanned with an OCR text layer. It is a compilation of physical constants, decay data, the chart of nuclides, attenuation and energy-absorption coefficients, buildup factors, neutron data, X-ray shielding design data, film and screen speeds, depth-dose tables, dosimetry, and regulatory and rules-of-thumb material. Only the X-ray shielding section (printed pp. 150-161, PDF 162-173) was mined. It reprints the NBS Handbook 76 barrier equations and lead and concrete transmission curves from 50 kV to 3 MV, and the broad-beam HVL table. It reprints the NCRP Report 33 table of lead needed to cut a beam to 5 percent, which applies also to the lead equivalent of lead rubber and lead glass. It reprints the commercial lead-sheet table and concrete and iron equivalents of lead from NBS Handbook 50. It adds output tables from the 1964 PHS population-exposure survey: mean mR/mAs at 12 inches by kVp (45-100) and total filtration (0.5-4.5 mm Al) for dental and nondental units. It also adds J. R. Cameron's charts of mR/mAs versus focus distance and versus filtration for 40-150 kVp. Together these give low-kV output at several filtrations and the means to turn an output estimate into a barrier thickness. Printed p. 161 (PDF 173), the Fine and Hendee X-ray critical-absorption table, is a McGraw-Hill/Nucleonics copyright reprint. Other third-party reprints elsewhere in the book (Central Scientific, ACGIH, Alfred Electronics) were not used.

    shieldingsafetydetectorsphysics-theory

  44. The Absorption Coefficient for Slow Electrons in Gases

    Robert B. Brode (Norman Bridge Laboratory of Physics, California Institute of Technology) · 1925 timeless reference relevance 3 · hands-on 3 hosted

    Brode's Physical Review paper (vol. 25, pp. 636-644, May 1925; the PDF adds the issue's first page) measures the total absorption (beam-removal) coefficient of 2-360 eV electrons in argon, helium, methane, hydrogen, nitrogen and carbon monoxide. Following Ramsauer, electrons from a tungsten helix are bent magnetically round a 1 cm radius circle through 1 mm slits into a Faraday box (3.2 cm path, copper apparatus baked to 450 C, mercury diffusion pumps, McLeod gauge). The coefficient a, defined by I = I0 exp(-a x p) with x in cm and p in mm Hg, is the total effective loss area of the molecules in 1 cm^3 at 1 mm Hg; it is obtained from two-pressure current ratios and found independent of pressure and of beam current. Results: argon shows the Ramsauer effect, a sharp maximum near 12 V with the 2 V value one-fifth of the peak; helium peaks at 4 V; methane at about 7.5 V; nitrogen and carbon monoxide are nearly identical, with a minimum near 9 V and a maximum near 18 V; hydrogen has no maximum and rises steadily down to 2 V. The curves (Figs. 5-6) give a in cm^-1 per mm Hg against the square root of voltage and convert directly into beam mean free paths at a given fill pressure. A theoretical section compares nitrogen and hydrogen with Zwicky's polarisation model. No neon data are given.

    physics-theoryvacuumbeam-dynamicsbeam-measurement

  45. Tables of Energy Losses and Ranges of Electrons and Positrons (NASA SP-3012)

    Martin J. Berger (National Bureau of Standards, Washington, D.C.); Stephen M. Seltzer (National Bureau of Standards, Washington, D.C.) · 1964 timeless reference relevance 3 · hands-on 2 hosted

    The NBS electron stopping-power and range compilation prepared for NASA (contract R-80) and the NAS-NRC Subcommittee on Penetration of Charged Particles. Table I gives, for about forty elements, compounds and mixtures (including neon, argon, air, water and common detector and shielding materials) and eighty energies from 10 keV to 1000 MeV, the collision, radiative and total mass stopping powers (MeV cm^2/g), the continuous-slowing-down-approximation range (g/cm^2) and the radiation yield. The method section states the Bethe collision formula in the Rohrlich-Carlson form, the adjusted mean excitation energies used (e.g. 42 eV for He, 131 eV for Ne), the Sternheimer density-effect correction and its pressure scaling for gases, the bremsstrahlung treatment, and the range definition, including the arbitrary low-energy closure below 1 keV and its effect on 10 keV ranges. Auxiliary tables cover density-effect reductions for gases, critical energies, radiation yields, positron/electron ratios and comparisons with measured stopping powers. The authors' accuracy estimate: collision stopping power to 1-2%, mean excitation energies uncertain up to 10% for very low Z, bremsstrahlung to 20% below 2 MeV. Only the 10-20 keV rows of the neon, argon and air tables were read for this corpus; the tables do not reach the tens-to-hundreds of eV regime.

    physics-theoryshieldingmodelingdetectors

  46. Radio Frequency Solid State Amplifiers

    J. Jacob (ESRF, Grenoble, France) · 2015 timeless reference relevance 3 · hands-on 3 arXiv ↗

    CERN Accelerator School 2014 lecture write-up (published in CERN-2015-003, pp. 197-216; arXiv:1607.01570) on high-power solid-state RF amplifiers for accelerators, illustrated by the seven 352.2 MHz, 150 kW ELTA/SOLEIL amplifiers at ESRF and the ESRF cavity-combiner prototype. It explains MOSFET operating classes (class A at most 50 %, ideal class B 78.5 %, push-pull class AB used to suppress even harmonics through the odd transfer characteristic), the module circuit (baluns, matching and bias set near 1 dB compression, 68-70 % efficiency at 650 W, a per-module circulator and 1200 W load), quarter-wave and Wilkinson splitters, and a scattering-matrix analysis of n-way combiners: each module alone sees nearly full reflection, power adds only for equal amplitude and phase, and an unpowered module can receive up to (1+|r|)^2 times a module's power under load mismatch, which burnt circulator loads in ESRF testing until delay lines and larger loads were fitted. Further sections cover the cavity combiner, power supplies and efficiency versus output (57 % at nominal, about 47 % at two-thirds), the ESRF specification (overdrive interlock, harmonics, sidebands, operation on mismatch at any phase, redundancy, failure rate), transient reflections when pulsing a high-Q cavity (fill time, steady and switch-off reflection exceeding twice the incident power) with a two-tier filtered/unfiltered reflected-power interlock, and the author's comparison of solid-state amplifiers with klystrons. Examples are at 352 MHz and 100 kW scale; the theory is frequency-general.

    rfphysics-theorysafetycontrols

  47. Primary and Secondary Products of Ionization in Hydrogen

    H. D. Smyth (Palmer Physical Laboratory, Princeton University; National Research Fellow) · 1925 timeless reference relevance 4 · hands-on 2 hosted

    Phys. Rev. 25, 452-468 (April 1925). Smyth used a positive-ray tube to sort the ions made by slow-electron impact in hydrogen. A tungsten or oxide-coated platinum filament fed electrons into an ionization region; the ions were accelerated through slits, bent round a semicircle by an electromagnet, and collected in a Faraday cylinder read by an electrometer. He establishes that the only primary product is the molecular ion H2+, formed at about 16 V, and that H+ and H3+ are secondary products made by collisions of H2+ with gas. Both appear as soon as H2+ forms, and he finds no evidence for higher critical potentials. Pressure runs from 0.0003 to 0.11 mm Hg, Table I and Fig. 4, show H2+ dominating at low pressure and being almost suppressed by about 0.05 mm, with H3+ and H+ strong. A kinetic model of H2+ survival fitted to the data puts H2+ dissociation at about 15 times the gas-kinetic collision rate, so H2+ travels about 1/15 of a molecular free path before being destroyed. A second experimental variable, the field through which ions drift after formation (V2), shifts the mix: higher V2 strongly favours H+ over H3+ (Figs. 5 and 6). Smyth argues that the apparent appearance potentials of H+ and H3+ (16-21 V) depend on the tube's conditions. He disputes Hogness and Lunn's interpretation and discusses the heat of dissociation of hydrogen. This is the physics of the hydrogen species mix in any electron-impact or low-voltage arc source.

    ion-sourcephysics-theory

  48. The Ionization of Hydrogen by Electron Impact as Interpreted by Positive Ray Analysis

    T. R. Hogness and E. G. Lunn (Department of Chemistry, University of California) · 1925 timeless reference relevance 4 · hands-on 2 hosted

    Phys. Rev. 26, 44-55 (July 1925). A positive-ray study of the ions made in hydrogen by electron impact, done in an ionization-potential tube with Dempster-type magnetic analysis and published alongside Smyth's paper, which the authors saw in proof. Table I and Fig. 2 give percentages of H+, H2+ and H3+ at pressures from below 1e-5 to 0.0056 mm Hg with 48 V electrons. At the lowest pressures the beam is 100 % H2+; H3+ rises roughly in proportion to pressure, reaching about 58 % at 0.0056 mm, with H2+ falling to 39 %; H+ stays at a few percent. Fig. 3 gives species percentages against electron energy from 18 to 48 V at one pressure; the authors attribute the trend to tube geometry, not impact energy. A stronger field drawing ions out of the ionization chamber raises H+ relative to H3+. A helium-hydrogen mixture gives 69 % H+ and no H3+, with evidence for HeH+. The corrected ionization potential for H2+ averages 16.0 V. They state practical conditions for making each ion predominate: for H+, a large potential difference plus an inert gas; for H2+, low pressure; for H3+, higher pressure and a small potential difference. They argue that H3+ forms mainly by H2+ + H2 → H3+ + H, against Smyth's tertiary-process view. The paper closes with a review of earlier critical-potential measurements and of the heat of dissociation. It gives the plainest early quantitative table of the hydrogen species mix against pressure.

    ion-sourcephysics-theory

  49. Use of Permanent Magnets in Accelerator Technology: Present and Future

    Klaus Halbach (Center for X-ray Optics, Lawrence Berkeley Laboratory, University of California) · 1987 timeless reference relevance 3 · hands-on 2 OSTI ↗

    LBL report LBL-23556 (May 1987), written by Halbach as an annotated set of viewgraphs rather than a conventional paper. It sets out the generic advantages of rare-earth permanent-magnet systems and the design concepts behind them. The key argument (p.3) is a scaling one: shrinking an electromagnet at fixed field drives coil current density up as the inverse of size until cooling or conductor limits force the field down, whereas permanent-magnet systems scale to any size without loss of field, so below some size they always win; where both work, the choice turns on cost and convenience, favouring permanent magnets less as the smallest relevant dimension grows. Later legends give the material model (remanence, differential permeability near 1, never driven past the knee, equivalent current or charge sheets), the easy-axis rotation theorem, segmented multipoles and dipoles, and hybrid iron-plus-magnet devices whose field is set by the iron surface: an adjustable quadrupole with a rotating outer ring, a hybrid dipole with an axial hole for which the line integral of H on axis is zero, a hybrid undulator with steel tuning studs, and permanent magnets used inside electromagnet poles to relieve saturation. Halbach notes he designs such systems with linked analytical formulas. Undulator and synchrotron-radiation material forms the remainder.

    magnetmaterialsmodelingphysics-theorycoils

  50. Physical and Optical Properties of Rare Earth Cobalt Magnets

    Klaus Halbach (Lawrence Berkeley Laboratory, UC Berkeley) · 1980 timeless reference relevance 3 · hands-on 2 OSTI ↗

    LBL report LBL-11393 (circa 1980; published in Nucl. Instrum. Methods 187 (1981) 109), Halbach's review of rare-earth-cobalt magnets for particle-optics devices. Section 3 gives the material model that underlies most later permanent-magnet design: a straight-line B-H curve with slope about 1.04 and remanence 0.85-1.05 T for the SmCo of the day, reversible motion of the working point along that line, irreversible recoil once the knee is reached (recovered only by driving far into the first quadrant), a perpendicular permeability also near 1, and therefore linear superposition of vacuum fields, with the residual error depending only on the difference between parallel and perpendicular permeabilities. It notes price drivers (grade, size, shape, dimensional and magnetic tolerances, volume; 1.5-30 $/cm^3 then). Section 4 lists general properties: fields unchanged under scaling, compactness and no supplies or cooling, superposition inside other magnets, operation to about 200 C with uniform, slowly changed temperature, and blocks limited to a few centimetres in smallest dimension. Sections 5-9 give segmented multipole formulas, the replacement of material inside a closed scalar-potential surface by steel, adjustable quadrupoles, analytic fringe fields, linear and helical undulators, and the zero line-integral condition for solenoid-like REC devices.

    materialsmagnetmodelingphysics-theory

Transitional 35

The 1980s–2000s: lecture slides, school proceedings, and reports from the period when accelerator design became a taught discipline. More theory than the classics, more machine than the modern slides.

  1. Design of a 2 MeV Cyclotron

    Peter V. Heuer and Heidi T. Baumgartner (The Cyclotron Kids) · 2009 transitional relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    Complete amateur design document for a 2 MeV proton cyclotron by the well-known high-school "Cyclotron Kids" team: proton energy requirements, vacuum chamber, ion source and beam characteristics, RF electronics with a full matching-network schematic, electromagnet yoke and coil design, and target/detector plans plus proposed experiments. The closest thing in this batch to a soup-to-nuts amateur build plan.

    cyclotron-generalmagnetcoilsrfmatchingdeeion-sourcevacuumchambertargetsdetectors

  2. A Preliminary Design for a Small Permanent Magnet Cyclotron (B.S. thesis, Houghton College)

    Barry Thomas King (advisor Mark Yuly), Houghton College · 2002 transitional relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Undergraduate design thesis for a tabletop cyclotron using a 0.5 T permanent magnet with adjustable iron pole pieces sealed to the chamber with vacuum grease, a single brass RF electrode driven at 3.6-11.5 MHz by a commercial amplifier, internal hot-cathode ionization of low-pressure hydrogen fill gas, and a diffusion pump with LN2 cold trap. Predicted energies 37.5-87.7 keV protons, 18.7-43.8 keV deuterons.

    cyclotron-generalmagnetrfdeeion-sourcevacuumchamber

  3. Accelerator Vacuum and Mechanical Engineering (USPAS course, UCRL-MI-201847)

    Louis R. Bertolini, Lawrence Livermore National Laboratory · 2004 transitional relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Complete US Particle Accelerator School short-course slide set on vacuum and mechanical engineering for accelerators, in 14 modules: vacuum fundamentals, estimating gasloads, system design calculations, mechanical/ion/NEG/Ti-sublimation/ cryo pumps, gauges, materials and joint design, leak detection, vacuum hardware, cleaning and processing, and supports/alignment. Taught by a practicing LLNL mechanical engineer with worked calculations.

    vacuumsealsmaterialsfabricationaccelerator-other

  4. Design and Construction of a Cyclotron Capable of Accelerating Protons to 2 MeV (B.S. thesis, MIT)

    Leslie Dewan (advisor David G. Cory), MIT Nuclear Science and Engineering · 2007 transitional relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Short MIT undergraduate thesis on designing and building a small proton cyclotron around a surplus Varian V-3900 NMR electromagnet (2.7 T at 1.25 inch gap), targeting ~2 MeV protons - enough for the Li-7(p,n)Be-7 reaction. Covers the basic orbit/energy math, magnet characterization from the vendor manual, and the planned chamber, RF, and target arrangement at student-lab scale.

    cyclotron-generalmagnetrfvacuumchambertargetsdee

  5. Iron Dominated Electromagnets, Lecture 6: Excitation, Coil Design, System Design and Water Flow

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    The engineering core of the series: ampere-turn calculation from the integral form of Poisson's equation, current-density vs magnet-power trade-offs, coil and power-supply system optimization to pick canonical current densities, and full water-cooling design — flow requirements from heat capacity, pressure-drop and Reynolds-number formulas, velocity limits.

    magnetcoilsfabrication

  6. Magnets for Cyclotrons

    S. Zaremba (IBA) · 2005 transitional relevance 5 · hands-on 4 DOI ↗ archived Aug 2026

    CERN Accelerator School lecture slides by an IBA accelerator physicist on designing cyclotron magnets, from an industrial compact-cyclotron perspective. Covers the iterative design workflow (hand calculations, then 2-D, then 3-D field codes), isochronism and how to obtain it via pole shaping/shimming, interaction of the magnet with RF, vacuum, ion source and extraction subsystems, and closes with mechanical design notes.

    magnetcoilscyclotron-generalbeam-dynamics

  7. A Permanent Magnet Circuit Design Primer (ARL-TR-946)

    Herbert A. Leupold and Ernest Potenziani II, Army Research Laboratory · 1996 transitional relevance 4 · hands-on 4 archive ↗

    A tutorial primer on designing permanent-magnet circuits using the permeance/load-line method: magnet materials (alnico, NdFeB) and their demagnetization curves, operating-point determination, flux and leakage estimation, gap field calculation, and worked numerical examples. Written as a self-contained introduction for engineers with no prior PM design experience. Scanned DTIC copy with usable OCR text.

    magnetphysics-theoryfabricationmaterials

  8. Iron Dominated Electromagnets, Lecture 4: POISSON — A Two-Dimensional Magnetostatic Solver

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Practical tutorial on the free LANL POISSON/SUPERFISH code family (Halbach/Holsinger): Automesh input files, POISSON/PANDIRA solvers, WFSPLOT graphics, and how to set up and interpret a 2D magnet cross-section field solution.

    magnetfabrication

  9. Iron Dominated Electromagnets, Lecture 8: Core Fabrication, Assembly, Installation and Alignment

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Shop-floor practices for magnet cores: solid vs laminated core selection, lamination stamping/stacking and iron-property uniformity across a magnet family, core assembly tolerances, fiducialization, and designing-in the support and alignment scheme from the start.

    magnetfabricationmaterials

  10. Iron Dominated Electromagnets, Lecture 9: Coil Fabrication, Testing and Electrical Safety

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Coil design and fabrication practices from LBNL/US labs: hydraulic plumbing rules (hose length and material, in/out fitting sizes, interlock placement), electrical safety practices and code compliance, coil QA specifications, and performance/acceptance tests (hipot, water-flow, thermal).

    coilsmagnetsafetyfabrication

  11. The Elusive Q of Single-Layer Air-Core Coils

    George Murphy, VE3ERP (CQ Magazine, May 1999) · 1999 transitional relevance 4 · hands-on 4

    Practical treatment of true coil Q for single-layer air-core inductors based on Callender's equation from Medhurst's data: Q-vs-frequency chart families for coil diameters and L/d ratios, explicit rules of coil Q, and closed-form design equations (inductance, turns, wire spacing) for hitting a specified Q, as implemented in HAMCALC.

    coilsrfmatchingfabrication

  12. Conventional Magnets for Accelerators (CAS lecture)

    Neil Marks, DLS/CCLRC Daresbury Laboratory · 2004 transitional relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    CERN Accelerator School (Baden bei Wien 2004) lecture on DC conventional magnets: cylindrical harmonic solutions, ideal pole shapes for dipole/quad/sextupole, symmetry constraints on field harmonics, ampere-turn calculations, C/H/window-frame yoke geometries, coil capital-vs-running cost optimization, and pole-profile/end design with OPERA/TOSCA field computation.

    magnetcoilsfabrication

  13. Iron Dominated Electromagnets, Lecture 10: Loose Ends — Forces, Stored Energy, Fringe Fields, End Chamfering

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 4 · hands-on 3

    Wrap-up lecture covering magnetic forces on conductors and pole faces, magnet stored energy and inductance, two- and three-dimensional fringe-field behavior, and end-chamfering techniques to reduce allowed multipole errors from magnet ends (eddy currents explicitly excluded).

    magnetfabricationphysics-theory

  14. Magnet System for PET Cyclotron Based on Permanent Magnets

    E. Antokhin (BINP) with T. Fujisawa, M. Kumada et al. (NIRS) · 2006 transitional relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    RuPAC 2006 paper describing the design, fabrication, and field measurement of a permanent-magnet main magnet for a 10 MeV PET proton cyclotron: 4-sector hill/valley geometry (2.3 T hill / 0.5 T valley, 1.4 T average), 20 mm hill gap, PM material volume sizing, plus beam-trajectory analysis in the measured field and RF system design.

    magnetcyclotron-generalbeam-dynamicsrf

  15. Probing and Modeling Voltage Breakdown in Vacuum

    Gregory Richard Werner, Cornell University (Ph.D. dissertation) · 2004 transitional relevance 4 · hands-on 3 publisher ↗ archived Apr 2026

    Cornell dissertation (public domain) on vacuum voltage breakdown: DC-gap and RF-cavity experiments plus particle-in-cell simulation of breakdown initiation. SEM/EDX/Auger surface analysis shows breakdown usually starts at foreign particulate contamination on the cathode, leaving craters and starburst patterns; derives a criterion that breakdown occurs when the product of local gas density and field-emission current exceeds a critical value.

    vacuumrfdeematerialsphysics-theory

  16. Semiconductor Detectors Part 2 (SLUO Lectures on Detector Techniques, Lecture 7)

    Helmuth Spieler (Lawrence Berkeley National Laboratory) · 1998 transitional relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    Second half of Spieler's classic SLAC lecture series on silicon detectors, focused on signal acquisition: detector current pulse shapes and durations, charge-sensitive preamplifier principles, input capacitance and noise matching, and a substantial section on radiation damage (displacement damage, NIEL scaling, leakage-current growth in irradiated silicon).

    detectorsphysics-theory

  17. The Cyclotron Magnet and RF Oscillator

    Carolyn Chun (Modern Physics Lab, Prof. Gershenson; Rutgers-style student report) · 2003 transitional relevance 4 · hands-on 3

    Short student report on shaping cyclotron pole faces to obtain a radially decreasing field for weak vertical focusing, comparing three analytic models (parallel-plate "magnetic capacitor", point-source/monopole, and dipole) and deriving pole-piece geometry (radius of curvature, slice angle, "lump model" with flat screw-mounting edge) for a 3 percent field droop on a 6-inch-radius pole. Includes field-index n values for each model and mentions a companion RF oscillator topic.

    magnetrfbeam-dynamicscyclotron-general

  18. Low-Energy Cross Sections for 11B(p, 3alpha)

    H. W. Becker, C. Rolfs, H. P. Trautvetter (Univ. Muenster), Z. Phys. A 327, 341-355 · 1987 transitional relevance 4 · hands-on 2 DOI ↗ archived Aug 2026

    The standard experimental measurement of the p + 11B -> 3 alpha reaction from 22 to 1100 keV center-of-mass energy, using proton beams on solid 11B targets and inverse kinematics with a hydrogen gas jet. Reports absolute cross sections, alpha angular distributions, the sequential decay mechanism via 8Be, and the astrophysical S-factor fit with S(0) = 197 +/- 12 MeV b.

    boron-11fusiontargetsphysics-theorydetectors

  19. Nuclear Fusion of Protons with Boron (BNL-47989)

    Alessandro G. Ruggiero, Brookhaven National Laboratory · 1992 transitional relevance 4 · hands-on 2 OSTI ↗ archived Aug 2026

    Conference paper analyzing accelerator-driven p-B11 fusion for power production. Works through a 675 keV proton beam on a fixed boron target (0.9 barn resonance, 8.7 MeV released as three alphas, direct electrostatic energy conversion) and shows quantitatively why the fixed-target scheme fails - ionization energy loss in the target overwhelms fusion yield - then develops a colliding-beam alternative and its accelerator requirements.

    boron-11fusiontargetsaccelerator-otherbeam-dynamics

  20. Design and Performance of a Compact H- Cyclotron (CP-42)

    G. O. Hendry, T. Y. T. Kuo, F. Ramsey, et al., The Cyclotron Corporation, Berkeley · 1981 transitional relevance 3 · hands-on 3

    9th International Cyclotron Conference (Caen 1981) paper on the CP-42, a commercial 11-42 MeV negative-hydrogen-ion cyclotron with internal PIG-type ion source producing 200+ uA external proton beam via stripping extraction, aimed at medical isotope and fast-neutron production. Gives a machine parameter table and system-by-system description including the computer control system.

    cyclotron-generalion-sourcerfbeam-dynamics

  21. Iron Dominated Electromagnets, Lecture 5: Perturbations

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 3 · hands-on 3

    Halbach first-order perturbation theory applied to iron-dominated magnets: how mechanical fabrication/assembly errors and pole excitation errors (shorted turns, unequal poles) map to error multipoles, with tables and expressions for translating allowed multipole errors into fabrication and assembly tolerances.

    magnetfabricationphysics-theory

  22. The Physics and Technology of Ion Sources, Second Edition

    Ian G. Brown (ed.), Lawrence Berkeley National Laboratory · 2004 transitional relevance 3 · hands-on 3

    Multi-author survey of the ion source field, one chapter per source type, opening with plasma physics and beam extraction fundamentals. The editor stresses that ion source work is empirical - build first, understand later - and the chapters lean experimental, but at facility/research level rather than construction level. Complements the Wolf handbook with more explanation and less tabulated data.

    ion-sourcephysics-theoryrfbeam-dynamics

  23. Iron Dominated Electromagnets, Lecture 1: Introduction and Scope

    Jack Tanabe, USPAS/Cornell (SLAC) · 2005 transitional relevance 3 · hands-on 2

    Opening lecture of Tanabe's USPAS course (companion to his book Iron Dominated Electromagnets): motivation from light-source synchrotrons, scope limited to conventional room-temperature iron magnets, magnet types (dipole/quad/sextupole), units, and course roadmap through design, fabrication, and measurement.

    magnetaccelerator-other

  24. Magnet Design (USPAS lecture slides)

    Y. Papaphilippou and N. Catalan Lasheras, USPAS/Cornell · 2005 transitional relevance 3 · hands-on 2

    USPAS 2005 survey lecture on accelerator magnet design: bending-field rigidity relation, magnetic materials and saturation, scalar/vector potential and multipole fields, ideal pole shapes, ampere-turn calculations, and cos-phi superconducting coil distributions. Breadth-first overview mixing practical iron-magnet basics with SC magnet theory.

    magnetcoilsmaterialsphysics-theory

  25. Electron Cyclotron Resonance Ion Sources and ECR Plasmas

    R. Geller, Institut des Sciences Nucleaires, Grenoble · 1996 transitional relevance 2 · hands-on 2

    The definitive monograph on ECR ion sources by their inventor: microwave-heated magnetically confined plasmas, minimum-B confinement, ECRIS design evolution, and performance for producing highly charged heavy ions. Graduate-level plasma physics with source-engineering history, aimed at facility-class multiply-charged ion production.

    ion-sourcephysics-theorymagnetrf

  26. An Introduction to the Physics of High Energy Accelerators

    D. A. Edwards, M. J. Syphers (SSC Laboratory) · 1992 transitional relevance 2 · hands-on 1

    Standard graduate textbook on synchrotron-era accelerator physics, written by SSC physicists: transverse (betatron) and longitudinal (synchrotron) dynamics, lattice optics, emittance, acceleration and RF, intensity-dependent effects, and synchrotron radiation. Oriented at large ring machines rather than cyclotrons.

    beam-dynamicsaccelerator-otherphysics-theoryrf

  27. Design of Accelerator Magnets (CERN Accelerator School)

    S. Russenschuck, CERN · 2005 transitional relevance 2 · hands-on 1

    CERN Accelerator School lecture paper on analytical and numerical field computation for conventional and superconducting accelerator magnets. Covers the Laplace-equation treatment of aperture fields, multipole expansions, ideal pole shapes for conventional magnets and ideal current distributions for superconducting ones, with LEP and LHC dipole/quadrupole examples.

    magnetphysics-theoryaccelerator-other

  28. Electron Cyclotron Resonance (E.C.R.) Ion Sources (Invited Paper)

    Y. Jongen (Laboratoire du Cyclotron, Louvain-la-Neuve / LBL) · 1984 transitional relevance 2 · hands-on 1

    Review from the 10th International Cyclotron Conference (East Lansing) of the first generation of ECR sources descended from Geller's SUPERMAFIOS: two-stage hexapole-stabilized designs, permanent-magnet vs superconducting hexapoles, and operational surprises (small sources work as well as large; optimum pressure higher than theory predicted) that forced revision of early ECR theory.

    ion-sourcemagnetrfphysics-theory

  29. Iron Dominated Electromagnets, Lecture 2: Mathematical Formulation of the 2D Magnetic Field

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 2 · hands-on 1

    Develops the 2D magnetostatic theory underlying the course: Maxwell's steady-state equations, Laplace and Poisson equations, complex-variable formulation F(z), multipole expansions, and why 2D analysis suffices for integrated fields of real 3D magnets.

    magnetphysics-theory

  30. Iron Dominated Electromagnets, Lecture 3: Conformal Mapping

    Jack Tanabe, USPAS/Cornell · 2005 transitional relevance 2 · hands-on 1

    Uses conformal mapping (w = z^2/h etc.) to map quadrupole and sextupole geometries into the dipole space, so dipole pole-overhang and field-quality rules can be reused to design and optimize quadrupole/sextupole pole contours.

    magnetphysics-theory

  31. Ion Cyclotron Resonance Spectrometry II (Lecture Notes in Chemistry 31)

    H. Hartmann, K.-P. Wanczek (eds.), Springer-Verlag · 1982 transitional relevance 1 · hands-on 1

    Proceedings volume of 28 papers from the 2nd International Symposium on Ion Cyclotron Resonance Spectrometry (Mainz, 1981), covering ion-molecule chemistry of simple molecules, systematic ion chemistry studies, ICR/FT-ICR spectrometer development, and theory. This is analytical mass-spectrometry chemistry that happens to exploit the cyclotron resonance principle for trapped ions, not accelerator engineering.

    physics-theorymagnetdetectors

  32. Ion Sources for Cyclotrons (9th Int. Conf. on Cyclotrons and their Applications, Caen)

    David J. Clark (Lawrence Berkeley Laboratory) · 1981 transitional relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    The classic survey of every ion-source family used in cyclotrons as of 1981: internal hot-filament hooded-arc sources, internal/external PIG sources (cold, hot, and bombardment-heated cathodes), and the then-emerging ECR and EBIS high-charge-state sources. Covers the physics of electron-impact ionization (cross-sections, Lotz formula, jT ionization factor), then gives concrete operating envelopes: PIG ignition at ~3 kV, running arcs of 300-2000 V at 1-15 A dc, 10-30 kV dc extraction external / 30-100 kV RF puller extraction internal, filament-source proton output of a few mA, and PIG cathode service life of a few hours to a day. Includes the GANIL test-stand PIG with sputter electrode, ORIC back-bombardment solid feed, and charge-state comparison tables (PIG vs ECR vs EBIS).

    ion-sourcecyclotron-generalphysics-theory

  33. The Design and Construction of a Small Cyclotron

    Mickael J. Cressman (advisor Mark Yuly) · 2006 transitional relevance 5 · hands-on 4 Houghton dspace ↗ archived Aug 2026

    Undergraduate thesis documenting the design and partial construction of the Houghton College cyclotron, a 15.2 cm GMW 3473-70 electromagnet machine (1.127 T at 50 A, 3.9 cm gap) aimed at 150 keV deuterons for d(d,n)3He neutron production, with helium commissioning first. Chapter 1 is the only published construction survey of the amateur/very-small machines, El Cerrito (1947), the LBL Cyclotrino (1987), Fred Niell's high-school cyclotron (1994-1995), the Rutgers 22.9/30.5 cm pair (2001), and Knox College (2000-2001), with concrete numbers and failure modes for each. Chapters 2-3 give the theory (including a fixed-frequency relativistic phase-slip energy-limit calculation) and the full as-built record, eight-port soldered brass chamber with named Lesker parts, sheet-copper hollow dee and strip-frame dummy dee, electron-microscope-filament ion source, measured 79 pF electrode capacitance driving the resonator design, GPIB/LabVIEW remote control, and a concrete-room occupancy interlock. At writing the machine was unfinished, vacuum, magnet, filament, and cooling tested, resonator and beam not yet. Two verified source-level misprints (diffusion pump heater 0.5 A; O-ring groove 3.28 cm wide) are flagged in the rules.

    cyclotron-generalmagnetchamberdeeion-sourcevacuumrfmatchingbeam-measurementcontrolstargetssafetyfabricationseals

  34. Spectroscopic Analysis of Electron-Beam-Induced Fluorescence in Hypersonic Helium Flow (NASA TN D-6005)

    Mervin E. Hillard, Jr. (Langley Research Center, Hampton, Va.); Stewart L. Ocheltree (Langley Research Center); Richard W. Storey (Langley Research Center) · 1970 transitional relevance 3 · hands-on 3 hosted

    A NASA Langley technical note on what a 26 keV electron beam emits when it crosses low-density helium. The beam was fired across the Mach 20 flow of the Langley 22-inch helium tunnel (free-stream number density 6.4-14.3 x 10^23 per m^3 at 2.2-2.5 K, with 40-400 ppm of nitrogen impurity) and the fluorescence was recorded with two spectrographs covering 3500-6500 A. Brightness followed local gas density. Three radiators were identified: atomic helium dominates inside the beam, molecular helium (He2, persisting more than 500 microseconds downstream) just downstream, and the N2+ first-negative system far from the beam and in shock layers. The nitrogen-ion emission was too intense for direct excitation at its concentration, so the authors attribute it to resonant transfer from helium metastables or He2+. Upstream fluorescence was traced to primary electrons backscattered from the tunnel wall (15 percent of a 26 keV beam backscatters from steel) and was reduced by a cylindrical collector. A 300 K static test at 100 ppm N2 showed no He2 emission, suggesting an inverse temperature dependence. The apparatus section documents the Langley gun: tungsten filament and shield at -10 to -40 kV with grounded anode, shield-bias current control (0 to 1.5 mA), magnetic positioning and focusing in a 61 cm drift tube, and a two-orifice differential-pumping section holding the gun at 2 x 10^-5 - 2 x 10^-4 mm Hg against up to 10 mm Hg outside.

    detectorsbeam-measurementphysics-theoryion-source

  35. Final Report on RF Voltage Breakdown in Coaxial Transmission Lines (JPL Technical Report 32-1500)

    R. Woo (Jet Propulsion Laboratory, California Institute of Technology, Pasadena; prepared under NASA contract NAS 7-100) · 1970 transitional relevance 4 · hands-on 4 NTRS ↗

    JPL's summary report (1 October 1970) of its spacecraft RF-breakdown programme, prompted by Ranger transmitter failures. Using similarity scaling and a minimum of measurements, Woo builds universal curves for coaxial lines (50, 74, 91 and 132.5 ohm) and parallel plates. Multipacting is treated first: it depends only on electrode secondary emission, so it is independent of gas type and of pressure once the mean free path exceeds the gap; the breakdown voltage is a function of fd alone for fixed impedance; multipacting is bounded by lower and upper voltage limits and does not occur below fd = 70 MHz-cm; the threshold rises as the discharge outgasses the electrodes; and a DC bias can suppress it only at fairly high values (Fig. 4, 28 MHz). Ionization breakdown follows, displayed as breakdown power against p/f for families of fd; Fig. 7 maps the fd-p/f plane (mean-free-path limit, multipacting cutoff, collision-frequency transition at p/f = 10^-3 torr/MHz, electron-oscillation-amplitude limit). The minimum falls at a pressure in microns equal to the frequency in MHz. Table 1 lists minimum ionization breakdown voltages and powers versus impedance; argon breaks down 45-60% and CO2 12-18% below air; uniform-field data and a minimum-voltage curve extend the method. A closing section lists prevention measures (geometry, solid dielectric, pressurisation, DC bias, low-yield coatings) without testing them.

    rfvacuumphysics-theorydee

Modern 160

Published since the 1990s: amateur and student build documents, theses from the teaching-cyclotron programs, conference papers, and current manuals. The most directly reusable for a build today, and the largest class.

  1. A Solid State 1.25 kW Linear Amplifier (QST, January 2015)

    Andrew J. Buckler, K2OP (ARRL QST) · 2015 modern relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    QST construction article for a single-cabinet homebrew 160 m - 2 m, 1.25 kW LDMOS amplifier using the MRFE6VP61K25H on W6PQL boards: two-deck architecture (2 m deck plus an HF+6 deck spanning 1.8-54 MHz from one device), common controller with sequencer, ALC, VSWR lockout, six-bank diplexer harmonic filtering, and copper heat-spreader thermal design. Includes ARRL Lab test results.

    rfmatchingfabricationcoils

  2. Characterizing the Performance of the Houghton College Cyclotron

    Daniel Haas, Houghton College (advisor Mark Yuly) · 2009 modern relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    Houghton College cyclotron thesis on the CHAMBER/DEE REBUILD after a dee-to-wall discharge destroyed the original glass-insulated dee in 2007. A new vacuum chamber and 15 cm dee were designed and built, run in a 1.1 T magnet with hot-filament ionization, and successfully accelerated protons, molecular hydrogen, and helium. Includes calibration of the pickup probe, magnetic field, and RGA-based gas analysis.

    chamberdeevacuumrfbeam-measuremention-sourcecyclotron-general

  3. Exploring the Capabilities of the Houghton College Cyclotron

    Nicholas A. Fuller, Houghton College (advisor Mark Yuly) · 2013 modern relevance 5 · hands-on 5 publisher ↗ archived May 2026

    Houghton College cyclotron thesis on WHOLE-MACHINE PERFORMANCE CHARACTERIZATION. The 72 mm max-radius machine at up to 1.2 T reached 317 keV protons (400 keV projected with better magnet supply/cooling). Performance was mapped against gas pressure, filament voltage, orbit radius, and dee voltage, and candidate low-energy nuclear reactions (D-D, (p,gamma) resonances on 19F and 31P) are proposed as physics targets.

    cyclotron-generalrfion-sourcevacuumbeam-measurementmagnettargets

  4. Field Mapping in Cyclotron Magnets

    Timothy W. Koeth, James E. Krutzler (Rutgers University) · 2015 modern relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    Practical write-up from the Rutgers 12-Inch Cyclotron project on 2-D magnetic field mapping of four interchangeable pole-tip sets: two azimuthally symmetric (weak focusing) and two AVF (radial and spiral sector). Describes the measurement hardware, mapping procedure, and analysis (average field, flutter, field errors, shimming verification), explicitly written to help others set up similar measurements.

    magnetbeam-measurementcyclotron-generalfabrication

  5. Initial Results from the Houghton College Cyclotron

    Andrew J. Loucks, Houghton College (advisor Mark Yuly) · 2007 modern relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    The first Houghton College cyclotron thesis: FULL INITIAL MACHINE description and first performance measurements. Covers the 15.3 cm chamber in a 1.1 T magnet, 2-15 MHz multi-kV RF, 1e-6 torr vacuum, hot-cathode ion source for H/He/D, plus supporting systems (water chiller, gas handling, current collector, GPIB control). Predicted max energies ~280 keV protons, 140 keV deuterons, and lays out D-D reaction theory as the goal.

    cyclotron-generalmagnetvacuumrfion-sourcebeam-measurementfusion

  6. Simple Penning ion source for laboratory research and development applications

    Joshua L. Rovey, Brandon P. Ruzic, Thomas J. Houlahan (Starfire Industries LLC) · 2007 modern relevance 5 · hands-on 5 DOI ↗ archived Mar 2024

    Three-page Review of Scientific Instruments note describing a deliberately simple, cheap PIG source buildable with basic machining: iron cathode body, SmCo permanent magnet (~3 kG), folded stainless sheet anode, iron faceplate. Delivers a continuous 1 mA H+ beam at 1 mTorr with 5.4 kV / 32.4 W. All dimensions, materials, and assembly steps are given expressly so others can replicate it.

    ion-sourcefabricationvacuummaterials

  7. Solid-state, 2-decade, 1.25 kW Linear Amplifier - Development Notebook

    Andrew J. Buckler, K2OP · 2015 modern relevance 5 · hands-on 5 publisher ↗ archived Aug 2026

    The full build diary behind the QST January 2015 article: a homebrew 1.8-148 MHz 1.25 kW LDMOS amplifier (MRFE6VP61K25H) built from W6PQL boards and Communication Concepts parts. Covers reference-design adaptation, SPICE work, VDD/metering, controller/ALC/attenuators, T/R switching, input/output transformer design, degenerative feedback, harmonic filters and SWR detection, packaging/cooling, failures encountered, and a complete bill of materials.

    rfmatchingfabricationcoilsmaterialsproject-management

  8. Basic design and engineering of normal-conducting, iron-dominated electromagnets

    Th. Zickler (CERN) · 2010 modern relevance 5 · hands-on 4 arXiv ↗ archived Aug 2026

    CERN Accelerator School guide-book (CERN-2010-004 proceedings) giving step-by-step analytic design of a conventional accelerator electromagnet before touching field codes. Covers magnet types, requirements gathering, magnetic circuit layout, yoke design, coil dimensioning, water cooling circuits, yoke/coil material selection, and magnet cost estimation, deliberately with minimal mathematics.

    magnetcoilsmaterialsfabrication

  9. Beam Energy Measurements with a new HV Deflection System and Ion Source Upgrades on the Rutgers 12-Inch Cyclotron

    Timothy Ponter, Rutgers University (Small Cyclotron Conference 2010) · 2010 modern relevance 5 · hands-on 4

    Detailed slide deck on adding an electrostatic deflector ("beam peeler") to the Rutgers 12-inch cyclotron to extract beam at 4 in radius and measure central energy and energy spread, plus ion source upgrades. Achieved successful deflection at 28 kV in a 0.97 T field, measuring ~0.51 MeV protons with 13.3 keV spread against a 12.7 keV prediction -- excellent theory/experiment agreement for a student machine.

    beam-measuremention-sourcedeebeam-dynamicssafety

  10. Canberra PIPS Detector Instruction Sheet with BKPD 50-11-500 AM detector certificates

    Canberra Industries / Canberra Semiconductor N.V. · 2012 modern relevance 5 · hands-on 4

    Canberra's one-page PIPS handling/operation instruction sheet plus factory test certificates for two specific Partially Depleted PIPS detectors, model BKPD 50-11-500 AM (serials 98343/98344, June 2012): 50 mm2 active area, 500 um depletion, warranted 11 keV alpha resolution. Covers bias-up procedure, leakage-current and pulser checks, alpha resolution testing, cleaning (isopropyl only, never methyl alcohol), and warranty limits.

    detectorsvendorvacuum

  11. Focusing in the Houghton College Cyclotron

    Sylvia I. Morrow, Houghton College (advisor Mark Yuly) · 2015 modern relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Houghton College tabletop cyclotron thesis on the MAGNET/FOCUSING subsystem. Most beam current was being lost to Dee and chamber-wall collisions, so the magnet and chamber were modeled in Poisson Superfish with ion tracking in SIMION 8.1 to improve weak magnetic focusing while keeping field index n below 0.2 inside the max orbit. Concluded the best fix is replacing aluminum chamber lids with magnetic stainless steel lids 2.2 cm larger in radius than the Dee, theoretically doubling max proton energy to 900 keV, though phase slippage limits practical gain.

    magnetbeam-dynamicschambercyclotron-generalphysics-theory

  12. The Cyclotron Kids 14-Inch Accelerator

    Heidi Baumgartner and Peter Heuer (Small Cyclotron Conference 2010) · 2010 modern relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    The two high-school "Cyclotron Kids" present their 14-inch, 1.6 T, 2.4 MeV-goal proton cyclotron built from scrounged parts at Jefferson Lab, aimed at eventual pair-production experiments. Covers the Poisson Superfish-designed magnet yoke from JLab boneyard scrap steel, 720-turn water-cooled pancake coils at 120 A, a 1e-7 torr diffusion-pumped chamber with removable thin lids on support rods, and a repurposed 3 kW 13.56 MHz plasma-sputtering RF generator being retuned to 24 MHz.

    cyclotron-generalmagnetcoilsvacuumrfchamberfabrication

  13. The Cyclotron Kids' 2 MeV Proton Cyclotron (Cyclotrons 2013, WE1PB05)

    H. Baumgartner, MIT (with P. Heuer; built at Jefferson Lab) · 2013 modern relevance 5 · hands-on 4 publisher ↗ archived Aug 2026

    Conference paper by two high-school students who designed and built a 2 MeV proton cyclotron at Jefferson Lab, later installed at Old Dominion University as an accelerator-physics teaching machine. Describes the 1.6 T H-frame electromagnet designed from donated 1060 steel scrap, and the dee/RF, vacuum, and ion-source design of the machine, with a survey of prior amateur cyclotrons (Neill, Koeth/Rutgers, Knox College, Houghton College).

    cyclotron-generalmagnetrfdeeion-sourcevacuumbeam-measurement

  14. Undergraduate Education with the Rutgers 12-Inch Cyclotron

    Timothy W. Koeth (University of Maryland / Rutgers) · 2015 modern relevance 5 · hands-on 4 DOI ↗ archived Aug 2026

    CAARI 2014 paper describing the Rutgers 12-inch student cyclotron: H-frame magnet with swappable weak-focusing and AVF pole tips (1.2 T max), single 5-inch-radius dee with 0.9-inch aperture, 2-30 MHz RF up to 1.5 kW giving ~10 kV dee voltage, and an internal cold-cathode PIG source. Recounts a decade-plus of student projects (field mapping, auto-tuner, deflection channel, internal targets, bunch-length measurement) and the beam-physics demonstrations the machine supports.

    cyclotron-generalion-sourcedeerfmagnetbeam-dynamicsbeam-measurementtargets

  15. Effective Scientific Equipment Procurement Strategies: Building on a Budget

    Fred Niell (Small Cyclotron Conference 2010) · 2010 modern relevance 5 · hands-on 3

    Practical talk by Fred Niell (who built a 300 keV cyclotron for under $1000 as a 1994 science-fair project) on procuring accelerator hardware cheaply. Opens with a sobering new-price shopping list (~$80k for a small accelerator), then teaches a cost/performance/ function envelope method for surplus buying, with a ranked list of surplus vendors from "sketchy" to "legitimate."

    project-managementvendorvacuummagnetrfcyclotron-general

  16. The 11B(p,a)8Be -> a+a and the 11B(a,a)11B Reactions at Energies Below 5.4 MeV

    M.C. Spraker, M.W. Ahmed, et al. (North Georgia / Duke-TUNL), J. Fusion Energy 31:357-367 · 2012 modern relevance 5 · hands-on 3 DOI ↗ archived Aug 2026

    Measures absolute cross sections and angular distributions for 11B(p,alpha)8Be from 0.15 to 3.8 MeV and 11B elastic alpha scattering from 2 to 5.4 MeV, using silicon detectors and thin boron targets. Cross sections are reported as total alphas detected to sidestep alpha-multiplicity ambiguity, with Legendre-polynomial fits of the angular distributions and phase-shift fits of the elastic data.

    boron-11fusiondetectorsbeam-measurement

  17. The Houghton College Cyclotron: a Tool for Educating Undergraduates

    M. Yuly, Houghton College (Proceedings of Cyclotrons2013, Vancouver) · 2013 modern relevance 5 · hands-on 3 publisher ↗ archived Aug 2026

    Peer-reviewed conference paper summarizing ten years of the Houghton College student cyclotron program: seven students built a working 1.2 T tabletop cyclotron theoretically capable of ~400 keV protons, embedded in a multiyear thesis curriculum. Includes a labeled machine photograph, construction/performance summary, and a short history of miniature educational cyclotrons (El Cerrito 1947, Iowa State 1954, Cyclotron Kids, etc.).

    cyclotron-generalproject-managementmagnetrfvacuum

  18. The Rutgers 12-Inch Cyclotron for Students

    Timothy W. Koeth, Dan Hoffman, William Schneider, Tim Ponter, Stuart Hanebuth, James Krutzler (Small Cyclotron Conference 2010) · 2010 modern relevance 5 · hands-on 3

    Overview talk on the Rutgers 12-inch student cyclotron: who built it, timeline (bug caught 1995, first beam on the 9-inch prototype September 1999, ~$15,000 over 10 years), and how it was folded into the Modern Physics Lab course in 2001, training 12 students in machining, RF/HV electronics, high vacuum, and radiation-safety diplomacy. Covers the chamber and the 9-inch prototype's resonance-sweep first-beam technique.

    cyclotron-generalchamberproject-managementbeam-measurementrfsafety

  19. 3.5 to 30 MHz Automatic Antenna Impedance Matching System

    William Blodgett (Cal Poly San Luis Obispo, EE senior project) · 2012 modern relevance 4 · hands-on 5 publisher ↗ archived May 2026

    Complete build documentation of an automatic HF impedance-matching (antenna tuner) system: L-network with stepper-motor-driven elements, homemade directional coupler, RF power/SWR sensors, ATmega32 controller, and power supply. Includes requirements, design, construction, calibration against a VNA, test results into dummy loads, full schematics, software listing, and bill of materials with costs.

    rfmatchingfabrication

  20. Aalborg AFC 26/36/46 Mass Flow Controllers Operating Manual (TD9305M Rev N)

    Aalborg Instruments · 2014 modern relevance 4 · hands-on 5 publisher ↗ archived Aug 2026

    Full operating manual for Aalborg AFC-series thermal mass flow controllers: installation, electrical connections, principle of operation, specs, operation, maintenance/cleaning, calibration, and troubleshooting.

    ion-sourcevacuum

  21. Deuterium Fusion Using Inertial Electrostatic Confinement (IEC)

    Kovalchick (independent/student project report) · 2012 modern relevance 4 · hands-on 5

    A complete amateur build report for a working D-D fusor: deuterium gas handling from a lecture bottle, Edwards RV3 + Leybold Turbovac 50 vacuum system, 21 cm stainless chamber as grounded anode, homebuilt 30 kV / 20 mA negative supply from an X-ray transformer, tungsten inner grid on an alumina stalk, and neutron detection with a BF3 counter plus silver activation attempts. Includes operating procedures, results, and error analysis.

    iec-fusorvacuumchamberion-sourcedetectorssafetyfabricationfusionshielding

  22. VAT Series 264/265 HV Angle/Inline Valve Installation, Operating & Maintenance Instructions

    VAT Vakuumventile AG · 2013 modern relevance 4 · hands-on 5 publisher ↗ archived Aug 2026

    Full installation, operating, and maintenance manual for VAT Series 264 (HV angle) and 265 (HV inline) pneumatically actuated normally-closed valves, DN 10-50 mm.

    vacuumseals

  23. Building A 9.25" OD Cyclotron (LinkedIn Pulse post)

    James Kwolik · 2015 modern relevance 4 · hands-on 4

    Web capture of an amateur builder's photo tour of his partially completed 9.25-inch cyclotron: 1080 lb magnet with commercially machined low-carbon-steel pole tips (chamfered for horizontal focusing, 1.2 T), an oil-cooled high-power RF matching network targeting 10-18 kV p-p on the dees, and a rotary-vane plus hot-oil diffusion pump stack with LN2 cryotrap claimed to reach 1e-9 torr. Machine was unfinished (needed a 3 kW RF supply) and in storage.

    cyclotron-generalmagnetrfvacuumfabrication

  24. Celerity Analog and Digital Mass Flow Controllers and Meters User's Manual

    Celerity, Inc. (Unit Instruments) · 2005 modern relevance 4 · hands-on 4 archive ↗

    User's manual for Celerity (Unit) analog and digital MFCs: model designations, features, installation, purging, electrical pinouts, power supplies, and the MultiFlo digital network interface.

    ion-sourcevacuum

  25. Central Pneumatic 3 CFM Two-Stage Vacuum Pump (Item 60805) Owner's Manual

    Harbor Freight Tools modern relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Owner's manual for a Harbor Freight rotary-vane vacuum pump (3 CFM, rated ultimate vacuum ~22.5 micron / 3 Pa): setup, operation, oil maintenance, and parts diagram.

    vacuum

  26. Detection of Charged Particles with Silicon Detectors (laboratory exercise)

    unknown (university teaching lab handout) modern relevance 4 · hands-on 4

    Teaching-lab procedure for alpha spectroscopy with surface-barrier/PIPS detectors: explains depletion region, electron-hole pair statistics, bias-vs-capacitance-vs-noise tradeoffs, then walks through vacuum chamber setup, bias adjustment, MCA pulse-height spectra, energy calibration, and resolution measurements with an alpha source.

    detectorsbeam-measurementvacuum

  27. MICOD CSA-250 Charge Sensitive Amplifier

    MICOD, Ltd. · 2018 modern relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Datasheet for the CSA-250 charge-sensitive preamplifier, the first-stage amplifier for silicon/scintillator-photodiode radiation detectors. Covers ratings, specifications, wiring, and output pulse characteristics.

    detectorsbeam-measurement

  28. MICOD SA-25 (MS-25) Shaper Amplifier

    MICOD, Ltd. · 2018 modern relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Datasheet for the SA-25 shaping amplifier that takes the CSA-250 preamp output and produces quasi-Gaussian pulses for a counter or spectroscopy ADC. Specs, ratings, and connection information.

    detectorsbeam-measurement

  29. Phase Space Characterization of an Internal Ion Source For Cyclotrons

    Edward Russell Forringer (Michigan State University, PhD dissertation, advisor Henry Blosser) · 2004 modern relevance 4 · hands-on 4 publisher ↗ archived Sep 2025

    MSU dissertation presenting the first published emittance and luminosity measurements of a cold-cathode PIG internal cyclotron ion source, using a purpose-built Ion Source Test Stand with DC extraction. Studies slit vs hole chimney apertures, shows aperture geometry dominates extracted-beam character, and develops 'plasma boundary' and 'plasma temperature' (~35,000 K, 4.5 eV) initial-condition recipes for orbit-tracking codes like Z3CYCLONE.

    ion-sourcebeam-measurementbeam-dynamicscyclotron-generalfabrication

  30. Qualiflow AFC 202D Mass Flow Controller User's Manual (D-10-018 V04)

    Qualiflow · 2002 modern relevance 4 · hands-on 4

    User's manual for the Qualiflow AFC 202D digital mass flow controller, covering installation, analog/digital interfacing, operation, and maintenance.

    ion-sourcevacuum

  31. VAT Series 265 HV Inline Valve DN 16 (26524-KA21-0001) Product Data Sheet

    VAT Vakuumventile AG modern relevance 4 · hands-on 4 publisher ↗ archived Aug 2026

    Data sheet for the specific VAT valve owned: Series 265 HV inline valve, ISO-KF 16 flanges, pneumatic single-acting actuator with closing spring and open/closed position indicators, bellows feedthrough.

    vacuumseals

  32. Cyclotron Magnets (ECPM37 lecture, Groningen)

    William Beeckman · 2009 modern relevance 4 · hands-on 3

    87-slide lecture from the 2009 European Cyclotron Progress Meeting covering cyclotron magnet design end to end: orbit theory and isochronism, edge/spiral/AG focusing, betatron oscillations and resonances, then intensely practical material on field shaping ("the field shaping zoo"): steel shimming, lateral pole-edge milling, movable iron inserts/flaps, steel grades, and a worked C235 magnet design example using 2D/3D field codes.

    magnetcoilscyclotron-generalbeam-dynamicsmaterialsfabrication

  33. Modifications on the Houghton College Cyclotron

    Mark Yuly, Daniel Haas, Andrew Loucks, et al., Houghton College (Small Cyclotron Conference 2010) · 2010 modern relevance 4 · hands-on 3

    Conference slides on the Houghton cyclotron's post-spark rebuild and upgrades: annotated chamber layout (dee, dummy dee, filament, pickup probe, feedthroughs, ceramic spacer), full vacuum-system schematic (diffusion pump, cold trap, RGA, leak valve, gauges), and the RF chain (HP 33120A function generator, ENI 155LCRH power amp, LDG AT-200PC autotuner) with tuned-circuit resonance formula.

    cyclotron-generalvacuumrfchamberdeeion-source

  34. Siglent SDS1000X-E Series (SDS1104X-E) Digital Oscilloscope - User Manual

    Siglent Technologies modern relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    User manual for the Siglent SDS1000X-E series digital oscilloscopes (e.g. the 4-channel 100 MHz SDS1104X-E): acquisition, triggering, math/FFT, measurements, decoding, and remote control setup.

    rfbeam-measurement

  35. Unit 10, Lecture 14: Cyclotron Basics (MIT 8.277 Intro to Particle Accelerators)

    Timothy A. Antaya (MIT Plasma Science and Fusion Center) · 2010 modern relevance 4 · hands-on 3 publisher ↗ archived Aug 2026

    MIT course lecture slides introducing cyclotrons and synchrocyclotrons by Antaya (designer of high-field superconducting cyclotrons). Builds from motion in a magnetic field through the key characteristics, performance limits, and applications of each cyclotron type, ending at a practical design exercise for a prototype high-field cyclotron.

    cyclotron-generalmagnetbeam-dynamics

  36. IUAC's 60 kV Tabletop Ion Accelerator

    Inter-University Accelerator Centre, New Delhi modern relevance 4 · hands-on 2 publisher ↗ archived Aug 2026

    Two-page announcement of IUAC's in-house 60 kV educational tabletop ion accelerator for university teaching: cold-plasma PIG ion source (300 microamp), 60 kV column, analyzing magnet (R = 250 mm, 1100-2600 G), electrostatic quadrupole triplet, beam scanner, running proton, alpha, and molecular hydrogen beams in a 3 x 3 m room on 1 kVA of power.

    accelerator-otherion-sourcevacuumbeam-measurementmagnet

  37. MRF1K50H: 1500 W CW, 1.8-500 MHz, 50 V RF Power LDMOS Transistor Data Sheet

    NXP Semiconductors · 2017 modern relevance 4 · hands-on 2 publisher ↗ archived May 2025

    Datasheet for NXP's high-ruggedness 1500 W CW LDMOS transistor for 1.8-500 MHz ISM, broadcast, and scientific service at VDD = 50 V; typical 27 MHz CW performance is 1550 W at 25.9 dB gain and 78.3% drain efficiency. Includes absolute maximums, thermal data, impedance tables, reference-circuit schematics and performance curves, all relevant to unmatched wideband use into high VSWR loads.

    rfmatchingvendormaterials

  38. Understanding the 11B(p,alpha)alpha-alpha reaction at the 0.675 MeV resonance

    S. Stave, M.W. Ahmed, R.H. France III, et al. (Duke/TUNL), Physics Letters B 696:26-29 · 2011 modern relevance 4 · hands-on 2 DOI ↗ archived Aug 2026

    Revisits the reaction mechanism of 11B(p,alpha)alpha-alpha at the 675 keV resonance, showing the 1987 two-step model (one high-energy primary alpha plus two soft secondaries) is wrong. Coincidence data and simulations show the primary alpha has l=3 and the decay yields TWO nearly-equal high-energy alpha particles plus one low-energy alpha, as originally proposed in 1936. Notes implications for astrophysics and fusion energy.

    boron-11fusiondetectorsphysics-theory

  39. Improvements to Siemens Eclipse PET Cyclotron Penning Ion Source

    D. Potkins, M. Dehnel, S. Melanson, T. Stewart, P. Jackle (D-Pace Inc.); J. Hinderer, N. Jones, L. Williams (Siemens) · 2017 modern relevance 3 · hands-on 4

    Industrial optimization campaign (80+ experiments) on the cold-cathode PIG H- source of the Siemens Eclipse 11 MeV PET cyclotron, aiming to raise target current from 120 to 150 uA and rebuild interval from 120 to 300 hours. Documents the source anatomy (tantalum cathodes, Elkonite hourglass anode, 4 mm plasma column in a 0.7 T field, -17 kV bias) and tests of cathode/anode/puller geometry, materials, gas flow, and cesium addition (+20% current).

    ion-sourcematerialsfabricationcyclotron-general

  40. AirTAC 4V200 Series Solenoid Valve (5/2, 5/3 way)

    AirTAC modern relevance 3 · hands-on 3

    Datasheet for AirTAC 4V200-series pilot-operated pneumatic solenoid valves (5-port 2/3-position, 0.15-0.8 MPa air): specs, coil data, ordering code, internal structure, and dimensions.

    vacuumfabrication

  41. Boron Fiber Neutron Shielding Properties

    J.W. Hanafin, W. Grant (Specialty Materials Inc.), L. Bobek, T. Regan (UMass Lowell Radiation Laboratory) · 2011 modern relevance 3 · hands-on 3

    Vendor/university test report comparing thermal-neutron shielding effectiveness of boron fiber, boron nanopowder, and 99%-enriched 10B4C dispersed in epoxy composites, measured at the UMass Lowell reactor in various layups and thicknesses. Gives isotope background (10B 3800 barn enriched vs 760 barn natural at 2200 m/s) and attenuation results per configuration.

    shieldingmaterialssafety

  42. Design of an Actively Cooled Grid System to Improve Efficiency in Inertial Electrostatic Confinement Fusion Reactors

    Andrew Seltzman (Georgia Institute of Technology, Dept. of Physics) · 2008 modern relevance 3 · hands-on 3

    Undergraduate physics thesis on a liquid-cooled cathode grid for an IEC fusor, motivated by suppressing thermionic electron emission (which wastes power and generates bremsstrahlung X-rays). Covers reactor design chapter with real fabrication of a water-cooled grid, plus use of coolant calorimetry as a grid-power diagnostic.

    iec-fusorfabricationmaterialsvacuumshieldingfusion

  43. Hitachi Metals SAM SFC1480G/SFC2480G Series Mass Flow Controllers

    Hitachi Metals, Ltd. modern relevance 3 · hands-on 3

    Product pamphlet for Hitachi Metals SAM-brand G-series digital MFCs with Ni-Co alloy diaphragm valves: feature overview, model lineup, and specifications, but not a full operating manual.

    ion-sourcevacuumvendor

  44. Improving Particle Confinement in Inertial Electrostatic Fusion for Spacecraft Power and Propulsion

    Carl C. Dietrich (MIT, PhD thesis, advisor R.J. Sedwick) · 2007 modern relevance 3 · hands-on 3

    MIT PhD thesis on multi-grid IEC devices for spacecraft power, combining OOPIC simulation with a real UHV experiment. Includes substantial experimental engineering chapters: vacuum chamber retrofitting, spherical grid fabrication, a custom ion gun, ion detectors, and a candid comparison of beam/confinement diagnostics (grid-current measurement, beam dump, capacitive charge detection, laser-induced fluorescence) with error sources such as Earth's field and secondary electron emission.

    iec-fusorfusionion-sourcevacuumbeam-measurementdetectorsfabrication

  45. Siglent Digital Oscilloscopes - Remote Control (SCPI Programming) Manual

    Siglent Technologies modern relevance 3 · hands-on 3

    SCPI remote-control programming manual for Siglent digital oscilloscopes: NI-VISA setup, complete command/query reference, and programming examples in VC++, VB, MATLAB, and LabVIEW.

    rfproject-management

  46. Siglent SDG1000X Series Function/Arbitrary Waveform Generator - User Manual

    Siglent Technologies · 2017 modern relevance 3 · hands-on 3

    Full user manual for the SDG1000X arbitrary waveform generator covering front-panel operation, waveform setup, modulation/sweep/burst modes, arbitrary waveform editing, frequency counter, and remote interfaces.

    rf

  47. AN1955: Thermal Measurement Methodology of RF Power Amplifiers

    Mali Mahalingam, Edward Mares (Freescale Semiconductor) · 2014 modern relevance 3 · hands-on 2

    Freescale application note explaining how die junction temperature (TJ) and case temperature (TC) are measured on high-power RF transistors - IR microscopy on the exposed die for hot-spot TJ, thermocouple technique for TC - and how thermal resistance theta-JC is calculated from them for reliability derating.

    rfmaterialsvendor

  48. Breaking the Relativity Barrier: CURVE Electrodes

    Heidi T. Baumgartner (Small Cyclotron Conference 2010) · 2010 modern relevance 3 · hands-on 2

    Short concept talk proposing CURVE ("Curvaceously Undermining RelatiVistic Effects") electrodes: instead of frequency modulation or field shaping, the dee gap is geometrically reshaped turn-by-turn so the accelerating gap meets the phase-slipped particle, compensating relativistic phase slippage at constant drive frequency. Includes the gap-profile derivation method (plot particle coordinates at fundamental-period timesteps, offset D per turn).

    deebeam-dynamicsphysics-theoryrf

  49. Fabrication and Installation of a Table Top Accelerator (TTA) at Manipal

    P. K. Rath, P. Dittakavi, M. Gupta, G. Muenzenberg, Y. K. Gambhir (Manipal Centre for Natural Sciences / GSI) · 2018 modern relevance 3 · hands-on 2

    Two-page DAE Symposium on Nuclear Physics 2018 note describing an indigenously built 50 kV tabletop ion accelerator for student training at Manipal, based on IUAC drawings, with a cold plasma PIG ion source, in-house CAD (AutoCAD/ANSYS) design, ion optics, beam transport, and vacuum system.

    accelerator-otherion-sourcevacuumfabrication

  50. Future Trends in Cyclotrons (CERN Accelerator School, Accelerators for Medical Applications)

    Timothy A. Antaya, Antaya Science and Technology (ex-MIT) · 2015 modern relevance 3 · hands-on 2

    Survey talk on the state of the cyclotron art circa 2015: the three cyclotron flavors (Lawrence, synchro, isochronous), how each scales with energy and magnetic field, and the case for compact high-field superconducting cyclotrons for medical use. More strategic overview than engineering detail, but written by the leading compact-cyclotron designer.

    cyclotron-generalmagnetbeam-dynamics

  51. Siglent SDG1000X Series Function/Arbitrary Waveform Generator - Datasheet

    Siglent Technologies · 2016 modern relevance 3 · hands-on 2

    Datasheet for the Siglent SDG1000X dual-channel 30/60 MHz function/arbitrary waveform generators (150 MSa/s, 14-bit), with full electrical specification tables.

    rf

  52. The Houghton College Cyclotron: a Tool for Educating Undergraduates (talk slides)

    Mark Yuly, Houghton College (Cyclotrons 2013 conference talk) · 2013 modern relevance 3 · hands-on 2

    Slide deck accompanying the Cyclotrons2013 paper. Focuses on the pedagogy: how the physics major sequence at Houghton wraps the cyclotron build into multi-year student research projects, with photos of the machine and student subsystem work. Less technical detail than the paper or the theses.

    cyclotron-generalproject-management

  53. US Patent 7,466,085 - Cyclotron Having Permanent Magnets

    Ronald Nutt (Advanced Biomarker Technologies, LLC, Knoxville TN) · 2008 modern relevance 3 · hands-on 2

    Patent for a compact radioisotope-production cyclotron (PET biomarkers) that eliminates the conventional electromagnet coil: a plurality of dees and permanent magnets are alternately disposed in a circular arrangement, i.e. a separated-sector permanent-magnet cyclotron. Includes claims and five sheets of drawings showing the alternating dee/magnet geometry.

    magnetdeecyclotron-generalaccelerator-other

  54. An Introduction to Cyclotrons

    Yves Jongen (IBA), PTCOG 47 Education Session · 2008 modern relevance 3 · hands-on 1

    Tutorial slide deck by IBA founder Yves Jongen introducing cyclotron physics for the proton-therapy community. Covers the resonance principle, field index and axial focusing, betatron tunes, the energy limit of classical cyclotrons, synchrocyclotrons, and isochronous/AVF machines, with IBA commercial machine examples.

    cyclotron-generalmagnetbeam-dynamicsrf

  55. Cyclotrons and Fixed-Field Alternating-Gradient Accelerators

    M.K. Craddock (UBC/TRIUMF), K.R. Symon (University of Wisconsin-Madison) · 2008 modern relevance 3 · hands-on 1

    Authoritative review (for Reviews of Accelerator Science and Technology) of all fixed-field accelerators: classical cyclotrons, synchrocyclotrons, isochronous/AVF machines, and FFAGs, from Lawrence's 1929 concept through modern proton FFAGs. Covers the relativistic energy limit, the two escape routes (frequency modulation vs azimuthally varying fields), and intensity capabilities, with full orbit-dynamics formalism.

    cyclotron-generalaccelerator-otherbeam-dynamicsmagnetrfphysics-theory

  56. Fundamentals of Ion Sources - Introduction (USPAS course, Monday AM lectures)

    Daniela Leitner (LBNL/MSU), Damon Todd (LBNL), Daniel Winklehner (MIT) · 2016 modern relevance 3 · hands-on 1

    Opening lecture slides from the US Particle Accelerator School course on ion sources and low-energy beam transport. Surveys the whole family of ion sources (Bayard-Alpert, electron bombardment, hollow cathode, multicusp, cold- and hot-cathode PIG, ECR) and lays out course topics including plasma physics, extraction, diagnostics, and LEBT. Good taxonomy and orientation material rather than construction detail.

    ion-sourcephysics-theorycyclotron-general

  57. Improvement of Inertial Electrostatic Confinement Device by Magnetron-Discharge-Based Built-In Ion Sources

    T. Takamatsu, S. Ogawa, K. Masuda, H. Toku, K. Yoshikawa (Kyoto University), SOFE 2005 abstract · 2005 modern relevance 3 · hands-on 1

    One-page SOFE05 abstract on a magnetron-discharge built-in ion source for an IEC device: a grounded 35 mm nozzle anode, 20 mm coaxial cathode, and internal water-cooled NdFe permanent magnet, enabling discharge below 0.5 Pa and more than doubling current-normalized neutron yield in beam-injection mode.

    iec-fusorion-sourcemagnetfusion

  58. Introduction to Plasma Physics and Controlled Fusion (3rd ed.)

    Francis F. Chen · 2016 modern relevance 3 · hands-on 1

    Chen's classic plasma physics textbook in its 2016 third edition: single-particle motion, plasmas as fluids, waves, diffusion, equilibrium and stability, kinetic theory, nonlinear effects, and chapters connecting to controlled fusion and modern plasma applications.

    physics-theoryfusionion-source

  59. Physics in Action: Electromagnetism and Circular Motion in a Cyclotron (Teacher Version)

    Philip Freeman and Marcello Pavan (TRIUMF outreach) · 2010 modern relevance 3 · hands-on 1

    High-school lesson workbook (teacher edition with answers) built around the TRIUMF cyclotron: worksheets on the H- ion and its ionization energy, initial acceleration and injection, electrostatic focusing, and circular motion in the machine. Pure pedagogy - no construction content.

    cyclotron-generalion-sourcephysics-theory

  60. The Obsession Started in 1929 (My Obsession Started in 1995)

    Timothy W. Koeth, University of Maryland / Rutgers University (Small Cyclotron Conference 2010) · 2010 modern relevance 3 · hands-on 1

    Koeth's keynote history talk at the inaugural Small Cyclotron Conference tracing acceleration from Rutherford's 1927 challenge through Cockcroft-Walton, Wideroe, and Lawrence's 4-inch through 60-inch machines, to the first commercial cyclotrons (Collins Radio, source of the Rutgers 12-inch magnet). Ends with Koeth's curated list of every known amateur/small cyclotron from El Cerrito 1947 through the 2007-2010 generation.

    cyclotron-generalaccelerator-otherphysics-theory

  61. The thermonuclear fusion rate coefficient for p-11B reactions

    W.M. Nevins, R. Swain (Lawrence Livermore National Laboratory), Nuclear Fusion 40:865 · 2000 modern relevance 3 · hands-on 0

    Develops analytic approximations to the p-11B Maxwellian fusion rate coefficient for 1-70 keV and 50-500 keV temperature ranges, based on the revised (1987 Becker) cross-section measurements which run about 50% higher than earlier data. Compares fits against direct numerical integration and notes overall error is dominated by cross-section measurement uncertainty.

    boron-11fusionphysics-theory

  62. Central Pneumatic 3 Gallon Oilless Air Compressor (Item 97080) Owner's Manual

    Harbor Freight Tools · 2011 modern relevance 2 · hands-on 3

    Owner's manual for a 3-gallon oilless shop air compressor: safety, setup, operation, maintenance, and parts diagram.

    fabricationvendor

  63. Compact, low-cost, 14.5 GHz all-permanent magnet field ECR multiply charged ion source

    E. Galutschek, R. Trassl, E. Salzborn, F. Aumayr, HP. Winter (TU Vienna / JLU Giessen) · 2007 modern relevance 2 · hands-on 3

    Describes a compact 14.5 GHz ECRIS whose minimum-B confinement field comes entirely from NdFeB permanent magnet rings and a Halbach hexapole (0.9 T mirror peaks, mirror ratios 2.1/1.9), eliminating the ~30 kW coil power of its predecessor. Uses a 25 mm water-cooled plasma chamber, biased-waveguide coupling, gas mixing, triode accel-decel extraction at 1-10 kV, and full LabVIEW remote control; total system cost ~100 k$.

    ion-sourcemagnetrfvacuumfabrication

  64. UNI-T UT139A/B/C True RMS Digital Multimeters - Operating Manual

    UNI-T (Uni-Trend Technology) modern relevance 2 · hands-on 3

    Operating manual for the UNI-T UT139 series handheld true-RMS digital multimeters: safety rules, measurement instructions for each function, technical accuracy index, and maintenance.

    safety

  65. A Study on Uniformity of a Magnet

    P. Das et al. (Variable Energy Cyclotron Centre, Kolkata) · 2015 modern relevance 2 · hands-on 2

    Single-page poster on a room-temperature electromagnet built at VECC for a Penning ion trap. Presents a COMSOL 2-D axisymmetric model of the pancake coils, compares simulated axial/radial field profiles with measurements, and mentions ongoing cooling-water heat transfer simulation.

    magnetcoilsphysics-theory

  66. Compact Medical Cyclotrons and their Use for Radioisotope Production and Multi-disciplinary Research (Cyclotrons2016 TUD01)

    S. Braccini et al., Bern University Hospital / AEC-LHEP Bern · 2016 modern relevance 2 · hands-on 2

    Overview of commercial ~20 MeV hospital cyclotrons for isotope production and how the Bern machine was extended into a research facility: external beam line to a second bunker, and tuning procedures (ion source, RF, field) to reach beam currents from >150 uA down to the pA range for detector physics and ion beam analysis.

    cyclotron-generalbeam-measurementtargetsion-source

  67. Philo Farnsworth: Fusor (Inertial Electrostatic Confinement) — Rex Research compilation

    Rex Research (compiling Richard Hull, Adam Szendry, Tom Ligon, Farnsworth/Bussard patents) modern relevance 2 · hands-on 2

    Rex Research web compilation on the Farnsworth fusor: history of the multipactor and fusor development, Richard Hull's amateur fusor account, pointers to the Szendry advanced fusor, the Ligon Analog article, and Farnsworth/Bussard patent numbers. Redundant with the dedicated Hull and Ligon documents in this archive.

    iec-fusorfusionion-sourcevacuum

  68. Cost / Benefit Comparison for 45 MeV and 70 MeV Cyclotrons

    Contractor report for U.S. DOE Office of Nuclear Energy (May 26, 2005) · 2005 modern relevance 2 · hands-on 1

    DOE-commissioned study comparing purchase, beamline, operating, and lifetime costs of commercial 45 MeV vs 70 MeV isotope-production cyclotrons. Surveys cyclotron vendors, design and fabrication cost breakdowns, beamline cost scaling factors, and power requirements based on BNL and University of Nantes operating data.

    cyclotron-generalproject-managementvendor

  69. ECR Ion Sources for Accelerators (Invited Paper)

    C. Lyneis (Lawrence Berkeley Laboratory) · 1992 modern relevance 2 · hands-on 1

    Invited survey from the 13th International Cyclotron Conference of ECR ion source use at accelerators: over 40 sources in service, design features of CAPRICE-class sources (sextupole plus solenoid minimum-B fields, 10+ GHz microwave coupling), performance tables, and discussion of ECR plasma physics and future directions such as superconducting-magnet sources.

    ion-sourcemagnetrfcyclotron-general

  70. Engineering Electromagnetics, Third Edition

    Nathan Ida, University of Akron (Springer) · 2015 modern relevance 2 · hands-on 1

    Standard 1000-page undergraduate EM textbook: electrostatics, magnetostatics, magnetic materials and circuits, induction, Maxwell's equations, transmission lines, waveguides, and antennas, with many worked engineering examples. General theory background, not accelerator- or magnet-design-specific.

    magnetcoilsphysics-theoryrf

  71. Inertial-Electrostatic Confinement (IEC) of a Fusion Plasma with Grids

    Jon Nadler (Nuclear Engineering Dept., University of Illinois) · 1999 modern relevance 2 · hands-on 1

    Short review paper on gridded IEC fusion covering spherically imploding ion beams, multiple potential well formation, the field's history (Farnsworth, Hirsch, Verdeyen, Bussard, Miley), and the case for IEC as a compact neutron source. Mostly conceptual with a useful reference list into the primary literature.

    iec-fusorfusionphysics-theoryion-source

  72. Introduction to Accelerators, Lecture 4: Basic Properties of Particle Beams

    William A. Barletta (USPAS / MIT) · 2010 modern relevance 2 · hands-on 1

    USPAS introductory lecture slides on describing particle beams: phase space, emittance, Twiss parameters, beam moments, temperature, and brightness, with supporting E&M review (fields of current loops and moving charges). Conceptual foundation rather than machine design.

    beam-dynamicsphysics-theorybeam-measurement

  73. Ion Sources for RFQ Accelerators and for Cyclotrons

    A. Schempp (Institut fur Angewandte Physik, Goethe-Universitat Frankfurt / IAEA report) · 1998 modern relevance 2 · hands-on 1

    IAEA survey of ion sources used with RFQ linacs and cyclotrons: PIG, duoplasmatron, multicusp, and ECR sources, grouped by current and duty-factor class, with discussion of injectors, LEBT matching, emittance, and space-charge bottlenecks. Notes that PIG sources were first developed for cyclotrons to exploit the machine's own magnetic field. Broad and descriptive rather than constructional.

    ion-sourceaccelerator-othercyclotron-generalbeam-dynamics

  74. Plasma Jet Source Using an Inertial Electrostatic Confinement Discharge Plasma (US Patent 6,121,569)

    George H. Miley, Yibin Gu · 2000 modern relevance 2 · hands-on 1

    Miley/Gu patent on extracting a plasma jet from a gridded IEC discharge by opening one grid aperture, aimed at electric propulsion and materials processing. Describes IEC discharge operating modes (star mode, jet mode) and electrode configurations.

    iec-fusorion-sourceaccelerator-other

  75. Proposed Fabrication of a Low Energy DC Accelerator

    Sowmya S. Kulkarni, Sudha Deshmukh, A.T. Seshadri, Jain University, Bangalore · 2010 modern relevance 2 · hands-on 1

    Proposal (not a build report) from Jain University, Bangalore, for a low-energy DC electrostatic accelerator for student training and thin-film x-ray emission research, explicitly inspired by visits to the Rutgers 12-inch cyclotron community. Describes objectives and intended experiments only; no completed hardware.

    accelerator-otherproject-management

  76. Up From Nothing: The Michigan State University Cyclotron Laboratory

    Sam M. Austin, Michigan State University Press · 2015 modern relevance 2 · hands-on 1

    Illustrated institutional history of the MSU Cyclotron Laboratory / NSCL, from the first K50 cyclotron through the superconducting K500 and K1200 to the FRIB era, written by a longtime faculty member. Rich in photographs of magnet steel, dees, and assembly work, plus the funding, staffing, and lab-building story; not an engineering text.

    cyclotron-generalmagnetproject-management

  77. Kick it Harder! Pushing the Speed Limit in Particle Accelerators

    Jeffrey C. Smith, SLAC National Accelerator Laboratory (Small Cyclotron Conference 2010) · 2010 modern relevance 2 · hands-on 0

    Survey talk from a SLAC physicist covering the whole zoo of accelerator types -- electrostatic, linac, cyclotron, microtron, betatron, synchrotron/storage ring -- through the LHC and ILC, ending with plasma-wakefield and photonic band-gap acceleration. A big-picture physics colloquium, not a build talk.

    accelerator-otherphysics-theorycyclotron-general

  78. Proton-Boron (p-B11) colliding beam fusion reactor

    H. Vernon Wong, B.N. Breizman, J.W. Van Dam (Institute for Fusion Studies, UT Austin) · 1999 modern relevance 2 · hands-on 0

    Theoretical power-balance critique of the Rostoker/TAE colliding-beam p-B11 field-reversed configuration reactor. Concludes the power required to maintain the colliding-beam configuration is at least 5.1 times the fusion power output, demanding >84% electrical conversion efficiency, and that collisional beam spreading constrains boron density far below the fusion-power optimum.

    boron-11fusionphysics-theorybeam-dynamics

  79. RF Cavities (USPAS lecture, Cornell, June 2005)

    Y. Papaphilippou, N. Catalan Lasheras · 2005 modern relevance 2 · hands-on 0

    USPAS lecture slides on RF cavity fundamentals: wave equation in bounded media, TE/TM mode classification and indexing in rectangular and cylindrical geometries, waveguide dispersion, and the basics of using cavity fields for acceleration. Standard textbook electromagnetics aimed at accelerator students, not at lumped-element cyclotron dee circuits.

    rfphysics-theoryaccelerator-other

  80. Dipole Assisted Inertial Electrostatic Confinement

    Yoshikazu Takeyama, Robert Thomas, G.H. Miley (Fusion Studies Lab, Univ. of Illinois) · 2005 modern relevance 1 · hands-on 1

    Conference presentation (Trends in Fusion Research, 2005) on adding a central dipole magnetic field to an IEC device to raise central plasma density and reduce losses, with experimental setup and preliminary probe diagnostics. Lab-scale plasma experiment slides.

    iec-fusormagnetfusionphysics-theory

  81. Driven Subcritical Fission Research Reactor Using a Cylindrical Inertial Electrostatic Confinement Neutron Source

    G.H. Miley, R. Thomas, Y. Takeyama, L. Wu, I. Percel, H. Momota, H. Hora, X.Z. Li, P.J. Shrestha · 2005 modern relevance 1 · hands-on 1

    Concept paper proposing compact cylindrical IEC neutron sources (60-100 kV gridded star-mode devices) as drivers for subcritical fission research reactors, replacing accelerator-spallation systems. Reviews Illinois IEC neutron source work and notes engineering issues such as HV feedthroughs in radiation fields.

    iec-fusorfusionaccelerator-othershielding

  82. Inertial Electrostatic Confinement as a Power Source for Electric Propulsion (NASA-TM-109228, Vision 21 Conference)

    G.H. Miley, R. Burton, J. Javedani, et al. (Univ. of Illinois / NASA) · 1993 modern relevance 1 · hands-on 1

    Early Illinois/NASA concept paper proposing IEC fusion as a power source for electric propulsion, summarizing the gridded star-mode IEC experiments of the early 1990s and extrapolating to space power systems. Concept and program-survey level.

    iec-fusorfusionaccelerator-other

  83. Inertial Electrostatic Confinement Fusion (US Patent 7,550,741 B2)

    Frank Sanns, Jr. · 2009 modern relevance 1 · hands-on 1

    US patent (filed 2006, issued 2009) by amateur fusioneer Frank Sanns on an IEC fusion variant. Front matter cites the standard IEC literature (Ohnishi, Matsuura, Humphries). Patent-claim language describing electrode geometry modifications to the basic fusor concept.

    iec-fusorfusion

  84. Inertial Electrostatic Confinement Fusion for Spacecraft

    R.J. Sedwick, C. Dietrich, T. McGuire, N. Warner, D. Zayas (MIT Space Systems Laboratory) · 2006 modern relevance 1 · hands-on 1

    Single-page conference poster from MIT's Fusion Power and Propulsion Group on multi-grid IEC devices for spacecraft power. Presents the hypothesis that extra focusing grids channel ions away from grid wires to extend confinement time, and briefly describes the experimental setup (2 ft diameter UHV chamber, custom ion gun, HV supplies) and simulation results.

    iec-fusorfusionion-sourcevacuum

  85. Multiple Potential Well Structure in Inertial Electrostatic Confinement Devices

    Ryan M. Meyer (University of Missouri-Columbia, MS thesis) · 2004 modern relevance 1 · hands-on 1

    MS thesis analyzing multiple potential well formation in IEC devices, classifying uni-polar and bi-polar cathode-anode systems and extending Langmuir-Blodgett/Hirsch space-charge models. Primarily analytical modeling with a modest experimental component built in the university instrument shop.

    iec-fusorphysics-theoryfusion

  86. A General Critique of Inertial-Electrostatic Confinement Fusion Systems

    Todd H. Rider (MIT, S.M. thesis, advisor L. Lidsky) · 1994 modern relevance 1 · hands-on 0

    Rider's famous MIT master's thesis showing via velocity-space diffusion arguments that IEC devices cannot maintain the non-Maxwellian ion distributions needed for net power, especially with advanced fuels (D-3He, p-11B). The definitive theoretical critique that frames why fusors are neutron sources, not reactors.

    iec-fusorfusionphysics-theory

  87. ANSYS Installation and Licensing Documentation, Release 19.2

    ANSYS, Inc. · 2018 modern relevance 1 · hands-on 0

    Combined installation and FLEXlm licensing manual for ANSYS Release 19.2 (August 2018): license server setup, product installation on Windows/Linux, and troubleshooting. Pure software administration documentation with no engineering content.

    project-management

  88. Approximate Modeling of Cylindrical Inertial Electrostatic Confinement (IEC) Fusion Neutron Generator

    Blair P. Bromley, Luis Chacon, George H. Miley (Univ. of Illinois Fusion Studies Lab) modern relevance 1 · hands-on 0

    Two-page summary of the C-Fusion quasi-analytic model of the Illinois cylindrical IEC C-Device neutron generator (~1e6 n/s DD steady state), covering ion recirculation, charge-exchange-limited mean free path, and beam-background vs beam-beam vs fast-neutral reaction channels.

    iec-fusorfusionphysics-theory

  89. Fusion in a magnetically-shielded-grid inertial electrostatic confinement device

    John Hedditch, Richard Bowden-Reid, Joe Khachan (University of Sydney) · 2015 modern relevance 1 · hands-on 0

    arXiv theory paper claiming net energy gain is possible in a gridded IEC device if the cathode grid is magnetically shielded by coaxial current-carrying rings forming a spindle cusp, avoiding both grid and cusp losses. Analytical energy-balance modeling only; no device built.

    iec-fusorfusionphysics-theorymagnet

  90. Inertial Electrostatic Confinement (IEC) Based Compact X-ray Source

    S. Krupakar Murali (Multiversal Technologies) modern relevance 1 · hands-on 0

    Commercial slide deck pitching IEC devices as compact multi-mode radiation sources (x-ray, neutron) for space-station materials characterization and satellite applications. Application survey and comparison tables rather than design data.

    iec-fusorfusiondetectorsaccelerator-other

  91. Inertial Electrostatic Confinement (Wikipedia article capture)

    Wikipedia contributors · 2007 modern relevance 1 · hands-on 0

    2007 capture of the Wikipedia IEC article. Covers the Farnsworth-Hirsch fusor, Polywell and Penning-trap variants, hobbyist cost range ($500-$4000), the commercial NSD-Fusion neutron generator, and the Rider/Nevins critiques of IEC net-power viability.

    iec-fusorfusion

  92. Inertial-Electrostatic Confinement Fusion in Japan (Potential Well Measurements)

    Fusion Power Report (describing work of K. Yoshikawa, Kyoto University) · 2001 modern relevance 1 · hands-on 0

    One-page trade-press item summarizing Kyoto University's laser-induced fluorescence / Stark-effect measurement of the double-well potential profile (about 200 V dip) in a helium IEC plasma, plus a capsule history of IEC neutron yields from Hirsch to Wisconsin and Illinois.

    iec-fusorfusionphysics-theorybeam-measurement

  93. Introduction to Particle and Astroparticle Physics: Multimessenger Astronomy and its Particle Physics Foundations (2nd ed.)

    Alessandro De Angelis and Mario Pimenta · 2018 modern relevance 1 · hands-on 0

    Springer Undergraduate Lecture Notes in Physics textbook covering the Standard Model, field theory, cosmic rays, particle detectors and accelerators at survey level, and multimessenger astroparticle physics (gamma rays, neutrinos, gravitational waves). Rigorous undergraduate/early-graduate theory text with worked problems, not an engineering resource.

    physics-theorydetectorsaccelerator-other

  94. Magnetic Electrostatic Plasma Confinement

    T.J. Dolan (Idaho National Engineering Laboratory), Plasma Phys. Control. Fusion 36 (1994) 1539-1593 · 1994 modern relevance 1 · hands-on 0

    Original journal version of Dolan's 55-page review of magnetic electrostatic plasma confinement: four decades of electrostatic and magnetically shielded grid confinement experiments (Hirsch colliding beams, ATOLL, Jupiter-2M cusp machines), multiple potential well evidence, electron transport, and MEPC reactor projections. Same content as the retypeset copy in this folder.

    iec-fusorfusionphysics-theorymagnet

  95. Magnetic Electrostatic Plasma Confinement (review article, retypeset)

    Thomas James Dolan (Idaho National Engineering Laboratory) · 1994 modern relevance 1 · hands-on 0

    Retypeset (ca. 2009) edition of Dolan's 1994 Plasma Physics and Controlled Fusion review of magnetic-electrostatic plasma confinement (MEPC): four decades of gridded and magnetically shielded electrostatic confinement experiments, multiple potential well evidence, cusp geometries, and reactor scaling. Content duplicates the journal-page version of the same article, also indexed here.

    iec-fusorfusionphysics-theorymagnet

  96. Particles and Nuclei: An Introduction to the Physical Concepts (7th ed.)

    B. Povh, K. Rith, C. Scholz, F. Zetsche, W. Rodejohann · 2015 modern relevance 1 · hands-on 0

    Springer graduate textbook on nuclear and particle physics: scattering, form factors, deep inelastic scattering, quarks and the Standard Model, then nuclear structure, the nuclear force, decay, and thermodynamics of nuclei. General physics background, not accelerator engineering.

    physics-theorydetectorstargets

  97. Szilard as Inventor: Accelerators and More

    Valentine L. Telegdi (Physics Today 53(10), p.25) · 2000 modern relevance 1 · hands-on 0

    Physics Today history article on Leo Szilard's inter-war patent activity, showing he independently invented central features of the linac, cyclotron, and betatron in 1928-29 Berlin patent applications, years before or parallel to Lawrence. Historical and biographical; no engineering content.

    cyclotron-generalaccelerator-other

  98. Integration of the Inertial Electrostatic Confinement Diffusion Thruster for Testing

    Mark D. Becnel (University of Alabama in Huntsville / NASA MSFC) · 2011 modern relevance 0 · hands-on 1

    Student conference paper on a cylindrical IEC "diffusion thruster" that exhausts the plasma leak from a grid gap through a nozzle for propulsion, with an argon-fed prototype under test at MSFC. Concept and test-integration description.

    iec-fusoraccelerator-otherfusion

  99. ANSYS Quick Start Installation Guide, Release 19.2

    ANSYS, Inc. · 2018 modern relevance 0 · hands-on 0

    Eight-page condensed walkthrough for installing ANSYS 19.2 products. Software setup instructions only.

    project-management

  100. ANSYS Quick Start Licensing Guide, Release 19.2

    ANSYS, Inc. · 2018 modern relevance 0 · hands-on 0

    Eight-page condensed guide to installing the ANSYS 19.2 license file and FLEXlm license manager. Software setup instructions only.

    project-management

  101. ANSYS, Inc. Installation Guide for Windows (Release 19.2)

    ANSYS, Inc. · 2018 modern relevance 0 · hands-on 0

    Windows installation prerequisites and platform/system requirements for the full ANSYS 19.2 product line.

    project-management

  102. ANSYS, Inc. Linux Installation Guide (Release 19.2)

    ANSYS, Inc. · 2018 modern relevance 0 · hands-on 0

    Linux installation prerequisites and platform/system requirements for the full ANSYS 19.2 product line (Mechanical, Autodyn, LS-DYNA, CFX, Fluent, ICEM CFD, Icepak, etc.).

    project-management

  103. Dependence of Neutron/Proton Production Rate on Discharged Current in Spherical Inertial Electrostatic Confinement Plasmas

    T. Matsuo, H. Matsuura, Y. Nakao, K. Kudo (Kyushu University) · 2004 modern relevance 0 · hands-on 0

    Four-page theoretical paper modeling how neutron and proton production rates scale with discharge current in D-3He spherical IEC plasmas, arguing that energetic converged electrons enable greater-than-linear (I^2) scaling of the 3He(d,p)4He proton yield. Pure distribution-function modeling.

    iec-fusorfusionphysics-theory

  104. EKXL: A Dynamic Poisson-Solver for Spherically-Convergent Inertial-Electrostatic Confinement Systems

    Katherine E. King and Robert W. Bussard (EMC2, DARPA report AD-A257644) · 1991 modern relevance 0 · hands-on 0

    DTIC report describing the EMC2 1-D radial Poisson-solver code lineage for computing potential and density profiles in spherically convergent IEC (Polywell-line) systems. Documents code history, assumptions, and sample solutions. Simulation methodology only.

    iec-fusorphysics-theoryfusion

  105. Inertial Electrostatic Confinement (IEC) devices for propulsion of satellites used for disaster monitoring

    S. Krupakar Murali (Multiversal Technologies), CANEUS SSTDM · 2014 modern relevance 0 · hands-on 0

    Conference slide deck surveying IEC-based satellite propulsion modes (ion propulsion, charge-exchange neutral thrust, neutral injection, fusion-ash propulsion) and comparing them with conventional electric propulsion for small disaster-monitoring satellites. Concept-level survey.

    iec-fusoraccelerator-otherfusion

  106. Inertial Electrostatic Confinement Thrusters (ESA Advanced Concepts Team web page)

    European Space Agency, Advanced Concepts Team modern relevance 0 · hands-on 0

    Two-page capture of an ESA Advanced Concepts Team web page giving a brief overview of IEC devices repurposed as electric-propulsion thrusters, with a sketch of the gridded spherical geometry and citations to fusion-research origins. Purely introductory survey material.

    iec-fusoraccelerator-otherfusion

  107. The Cyclotron and Its Modeling

    V. L. Smirnov (JINR Dubna) · 2021 modern relevance 3 · hands-on 1 DOI ↗ archived Aug 2026

    Comprehensive review of cyclotron-type accelerators: systematization of machine types, structural units, theoretical basics, and a survey of numerical modeling techniques and program codes for cyclotron design and beam-dynamics analysis. Full-length Russian original from ЭЧАЯ v.52 no.5 (pp. 1158-1304), freely available from the JINR publisher site; the English translation (Phys. Part. Nuclei 52, 913, ~50 pp) is paywalled.

    cyclotron-generalbeam-dynamicsmagnetrfphysics-theory

  108. Cyclotrons: Magnetic Design and Beam Dynamics (CAS 2015 lecture slides)

    Willem Kleeven (IBA) · 2015 modern relevance 3 · hands-on 2

    112-slide deck version of the Kleeven-Zaremba review. Extraction block is slides 73-96: scheme taxonomy, stripping, turn-separation mechanisms, precessional recipe, ESD construction photos (C235, C70), gradient correctors, self-extraction, C400. Largely duplicates the paper's content but with more hardware photographs and annotated field plots.

    extractionmagnetbeam-dynamicscyclotron-general

  109. Cyclotron Beam Extraction by Acceleration (arXiv:2205.04124v3)

    C. Baumgarten (PSI) · 2022 modern relevance 3 · hands-on 1 arXiv ↗ archived Aug 2026

    Derives the quantitative condition for a beam to escape an isochronous cyclotron's fringe field purely by fast acceleration (no deflector, no foil): the race between the 90-degree RF phase-slip limit and the k=-1 bending limit. Result: required energy gain scales as (g/R)^2, i.e. maximum turn number Nt <= (R/g)^2 / (pi*Nh*gamma*(gamma+1)). Demonstrates by tracking that the PSI Ring would self-eject in <90 turns.

    extractionbeam-dynamicsmagnet

  110. Cyclotrons: Why/how are their dynamics different? (JINST 18 T03005)

    R. Baartman (TRIUMF) · 2023 modern relevance 3 · hands-on 1

    Compact modern overview (ICFA Beam Dynamics Newsletter #84) of what makes cyclotron dynamics special: isochronism to 1e-4/1e-5, frozen phase motion, space charge vortex effect. Section 7 gives a crisp logic of extraction vs phase acceptance: septum survival sets minimum turn separation, phase spread widens turns parabolically, stripping evades all of it.

    extractionbeam-dynamicscyclotron-generalphysics-theory

  111. Cyclotron Vacuum Model and H- Gas Stripping Losses (CYCLOTRONS 2010, MOPCP075)

    V. Nuttens, M. Abs, J.-L. Delvaux, Y. Jongen, W. Kleeven, et al. (IBA) · 2010 modern relevance 3 · hands-on 3

    Three-page IBA recipe for budgeting H- transmission against residual-gas stripping: lumped conductance network of hills/valleys/dees, surface outgassing inventory, Nakai et al. analytic stripping cross-sections integrated along the spiral orbit. Validated on the 70 MeV ARRONAX Cyclone 70 to ~1%.

    extractionvacuum

  112. New Cyclotron Developments at IBA (CYCLOTRONS 2004)

    Y. Jongen, W. Kleeven and S. Zaremba (IBA) · 2004 modern relevance 2 · hands-on 2

    Status paper whose lead section is the operational report on the self-extracting cyclotron: 14 MeV H+, no deflector, extraction via elliptical-gap pole-edge shaping, a machined groove/plateau, harmonic coils, and a beam catcher; 75-80% efficiency at 1-1.5 mA, with an improved design (pole edge parallel to trajectory, nu_r tailored 1.1 to 0.6 over last ten turns) predicted >90%. Also covers C400 and TRADE concepts.

    extractionmagnetcyclotron-general

  113. Beam stripping interactions in compact cyclotrons (arXiv:2103.15583v2; PRAB 24, 090101)

    P. Calvo, I. Podadera, D. Gavela, C. Oliver (CIEMAT); A. Adelmann, J. Snuverink, A. Gsell (PSI) · 2021 modern relevance 3 · hands-on 2 arXiv ↗ archived Aug 2026

    Quantitative treatment of both H- loss channels - residual-gas stripping (analytic cross-section fits, sigma maximal at 0.1-300 keV) and Lorentz (electromagnetic) stripping (lifetime formula from first principles with re-derived constants) - implemented in OPAL and applied to the AMIT compact superconducting cyclotron (8.5 MeV, 4 T): 14.6% gas-stripping loss at ~1e-4 hPa central-region pressure, Lorentz stripping negligible.

    extractionvacuumbeam-dynamicsphysics-theory

  114. Simulation of Electron Behavior in PIG Ion Source for 9 MeV Cyclotron (KIRAMS-13 lineage)

    X.J. Mu, M. Ghergherehchi, Y.H. Yeon, J.W. Kim, J.S. Chai (Sungkyunkwan University) · 2015 modern relevance 3 · hands-on 2

    CST Particle Studio study of secondary-electron production and confinement in an internal cold-cathode PIG (Ta cathodes 7 mm dia x 2 mm thick, anode cylinder 20 mm long, bores 6.16-10.1 mm) for the SKKU 9 MeV H- cyclotron, validated against the KIRAMS-13. Sweeps cathode potential (-100 to -2500 V) and magnetic field (0.2/0.4/0.6 T): secondary-electron count peaks at 0.2 T and falls hard by 0.6 T. Finds 7 mm anode ID maximizes electron density (8 mm gave highest beam current in KIRAMS-13; >9 mm degrades); off-axis cathode misalignment sharply cuts secondary emission and electron lifetime. Extraction modeling fixes puller 2.2 mm from the anode aperture and slit-to-puller rotation of -0.2 to -1.5 deg for >50% extraction. Bench data: beam current rises with both gas flow and arc current, gas flow being the stronger lever; max 48.3 uA on target at 2.0 A arc and 7.5 sccm H2.

    ion-sourcemodelingbeam-dynamics

  115. Characterization of the AMIT Internal Ion Source with a Devoted DC Extraction Test Bench (IPAC 2017)

    D. Obradors et al. (CIEMAT, Madrid; ANTEC Magnets) · 2017 modern relevance 4 · hands-on 4 DOI ↗ archived Aug 2026

    Bench characterization of the cold-cathode internal PIG (CuW anode chimney, two Ta cathodes, H2 fed through the cathode cavity) for the AMIT 8.5 MeV superconducting cyclotron, tested in a 130 mm gap dipole at up to 0.86 T. Documents the full ignition recipe: raise arc voltage to -3 kV and gas to up to 10 sccm, arc strikes in a few seconds, sustaining voltage <1 kV, then throttle gas down and current-regulate. Maps the V-I characteristic: below 250 mA the cathodes emit by secondary emission (high impedance); above, ion back-bombardment self-heats them thermionic and the curve goes negative-impedance and saturates. Arc power vs gas flow has a minimum near 4 sccm. Magnetic field has little influence once above a threshold. First-stage H- yield ~170 uA on a probe.

    ion-sourcebeam-measurementvacuum

  116. Heat Transfer Study of PIG Ion Source for 10 MeV Cyclotron (IPAC 2016)

    F. Zakerhosseini, S. Sabounchi, H. Afarideh (Amirkabir Univ.), J. Chai, M. Ghergherehchi (SKKU) · 2016 modern relevance 3 · hands-on 2

    ANSYS CFX / CST thermal study of the IRANCYC-10 internal cold-cathode PIG (Ta cathodes on a W-Cu alloy anode, source height 57 mm, total power ~500 W at ~1.1 A discharge). Cathode heads reach 1992 K under ion back-bombardment (well below Ta melting), the anode peaks at 472 K next to the exit slit, and cathode thermal deformation is ~0.2 mm. Water cooling at 0.007-0.04 kg/s (1-5 m/s in the coaxial lines, 18 C inlet) keeps water below 345 K. Thermionic emission from the 1992 K cathode computed at 7 mA - only 0.6% of the discharge current, i.e. this "cold cathode" source runs on secondary emission even at red heat.

    ion-sourcematerialsfabrication

  117. Investigation of Minimized Consumption Power about 10 MeV Cyclotron for Acceleration of Negative Hydrogen (Cyclotrons 2016)

    Jongchul Lee, K.M.M. Gad, H. Kim, S. Mun, H. Namgoong, D. Ha, M. Ghergherehchi, J.-S. Chai (SKKU) · 2016 modern relevance 2 · hands-on 2

    System-level design paper for the SKKUCY-10 10 MeV H- PET cyclotron (83.2 MHz 4th harmonic, 1.36 T average field, 40 kV dee, deep-valley 4-sector magnet). Its ion-source content is a power budget: the internal PIG is allocated 1.5 kW out of ~40 kW total (coil 26 kW, RF 14 kW), and central region simulation shows 197 uA / 190 keV bunched beam after the third gap from the PIG-plus-puller, delivering 90 uA at 9.8 MeV. Illustrates the standard internal-PIG + puller central-region architecture where the resonator electric field is matched to the chimney/puller structure.

    ion-sourcecyclotron-generalrfmagnet

  118. Das Lehr-Zyklotron COLUMBUS - Mit einem Teilchenbeschleuniger Physik und Technik erleben

    Martin Prechtl; Christian Wolf · 2020 modern relevance 5 · hands-on 4 Springer ↗ archived Aug 2026

    Springer essentials monograph (German, 80 printed pages) on COLUMBUS, a sub-50 keV hydrogen-ion teaching cyclotron built 2012-2014 by a Gymnasium physics course with Hochschule Coburg and Forschungszentrum Juelich. Each chapter opens with a student-teacher dialogue, then gives the dimensioning calculation for one subsystem: magnet (Bruker BE-15, 150 mm poles, 370 mT chosen at half the rated coil current), acceleration system (ICOM marine transceiver into a pi-filter matchbox driving a 330 kOhm dee at up to 3 kV; grounded dummy dee, 20 mm gap), vacuum system (mean free path, hydrogen gas-load balance, DN40 line conductance, effective pumping speed 17.2 l/s for H2, path-length-vs-energy trade), thermionic chimney ion source with puller electrodes, and a home-built Faraday cup. Chapter 9 reports real I(B) spectra at 2.82 MHz / 1000 V with proton and H2+ peaks identified by specific charge, plus sub-harmonic and direct-ion peaks. Four appendices derive the cyclotron frequency, mean free path, conductance and spiral path length.

    teaching cyclotronmagnetic rigidity and magnet selectionpole gap and chamber designdee voltage and first-orbit clearancepi-filter matchbox and marine-transceiver RF sourcevacuum sizing chain (mean free path, gas load, conductance, effective pumping speed)spiral path length vs final energythermionic hydrogen ion source with chimney and pullerhome-built Faraday cupI(B) beam spectra and specific-charge analysisdesign vs as-built operating pointpedagogy and school physics

  119. COLUMBUS - A Small Cyclotron for School and Teaching Purposes

    C. R. Wolf, M. Prechtl (University of Applied Sciences, Coburg, Germany) · 2022 modern relevance 5 · hands-on 3 JACoW ↗ archived Sep 2025

    Ten-year status paper on the COLUMBUS school cyclotron (Proc. Cyclotrons2022, Beijing, THPO001, pp. 288-290, DOI 10.18429/JACoW-CYCLOTRONS2022-THPO001, CC-BY-4.0 licensed). Documents the machine as it stands nine years after its design era — project start 2012, first beam April 2014, first student workshop autumn 2014 — with a full 2022 operating-point table (140 mm dees, 185 mT H+ / 370 mT H2+, dual RF frequencies 2.82/5.64 MHz via an improved matchbox, 0.5-3.0 kV dee voltage, ~4.1/7.5 keV final energy, 1e-6 mbar base / 1e-5 mbar with H2), the two-pillar educational concept (workshops and internships), the automated field-sweep beam-spectrum experiment with odd-subharmonic peaks, and future projects (extraction plus Wien filter with IBA support since August 2021; Penning source study; pre/post learning questionnaire).

    cyclotron-generalpedagogyrfbeam-measurementextractionion-sourcevacuumproject-management

  120. COLUMBUS - A Small Cyclotron for School and Teaching Purposes

    Ch. Wolf, M. Frank, E. Held (Gymnasium Ernestinum, Coburg, Germany) · 2013 modern relevance 5 · hands-on 4 JACoW ↗ archived Aug 2026

    Design-stage overview of the COLUMBUS school cyclotron presented at Cyclotrons2013, Vancouver (paper WE1PB03, ISBN 978-3-95450-128-1, CC-BY-3.0), written before first beam (which came in April 2014). Gives the pre-beam design table (140 mm dees, 0.38 T, 5.63 MHz, 2.0-3.0 kV dee voltage, 6-8 revolutions, 24-48 keV, 1e-5 mbar) and the two governing requirements, standard components only and a radiologically harmless final energy with no beam extraction. Documents the donated Bruker BE-15 laboratory magnet with adjustable pole pitch, the ten-port chamber fabricated free of charge by VACOM, the Koeth-pattern thermionic ion source, and the marine-transceiver RF chain with Collins-filter matchbox, directional coupler and diode RF pick-up. Chiefly valuable as the dated design-era snapshot against which the machine's later published operating points can be contrasted.

    cyclotron-generalmagnetrfion-sourcevacuumchamberpedagogyproject-management

  121. COLUMBUS - A Simple Ion Source

    M. Frank, Ch. Wolf, E. Held (Gymnasium Ernestinum, Coburg, Germany) · 2013 modern relevance 5 · hands-on 3 JACoW ↗

    Two-page companion design paper (Cyclotrons2013 WEPPT021, ISBN 978-3-95450-128-1, CC-BY-3.0, pre-beam) on the school cyclotron's thermionic ion source, built after Tim Koeth's Rutgers pattern. Describes collision ionization by electrons accelerated through 100-200 V DC on helical orbits in the guide field, the macor housing block with copper acceleration plate and chimney source-head, and the hydro-stick (10 L at 10 bar, reduced to 0.3 bar) plus mass-flow-controller feed holding roughly 1e-4 mbar. Its distinctive content is the positioning philosophy for a machine of ten or fewer revolutions, an ion source left adjustable along the gap direction and mounted under the dummy-dee rather than fixed at centre, plus a rotatable source-head so the emission angle can be tuned by experiment.

    ion-sourcebeam-dynamicsvacuum

  122. Simulation and Detection of the Helical Ion-Paths in a Small Cyclotron

    Ch. Wolf, R. Rueß, M. Prechtl · 2016 modern relevance 5 · hands-on 3 JACoW ↗

    MATLAB first-turns simulation for the school-built COLUMBUS cyclotron (project begun 2012, first beam April 2014), paired with measurements from a Faraday cup on a radial linear translator behind the dummy dee. The simulation integrates the coupled Lorentz-force equations in the acceleration gap (rather than the straight-crossing school approximation) and uses analytic circular arcs inside the dees, terminating trajectories on virtual obstacles. Measured-versus-simulated comparisons cover a radial intensity scan I(x), a predicted-and-observed off-resonance H2+ signal at B = 66 mT, and a fixed-detector B-sweep spectrometer mode that identifies H+ and H2+ populations. The authors state the model is qualitative, listing its constant-beam and particle-conservation assumptions. Proc. Cyclotrons2016 MOB02, doi 10.18429/JACoW-Cyclotrons2016-MOB02, CC-BY 3.0.

    modelingbeam-dynamicsbeam-measurementdetectorspedagogy

  123. 3D Printing for High Vacuum Applications

    C. R. Wolf, F. B. Beck, L. Franz, V. M. Neumaier · 2019 modern relevance 5 · hands-on 4 JACoW ↗

    Experimental qualification of laser powder-bed (LaserCUSING, stainless 1.4404) 3D-printed components for high vacuum, from the group behind the COLUMBUS school cyclotron. A printed KF connector and a hybrid printed tube with conventionally welded flanges both reached 1.5e-5 mbar; 24-hour pressure-rise tests in a 3.6 l chamber gave 7.39e-7 mbar*l/s for the uncleaned printed part versus 5.25e-7 for a conventional stainless connector, improving to 2.15e-7 after isopropanol ultrasonic cleaning — better than the wrought part. The work culminates in a complete printed vacuum chamber with CFD-shaped flow channels integrated in the wall for heating during evacuation and cooling in operation. Validation is explicitly bounded to high vacuum; Viton gaskets dominate leakage there, with surface roughness expected to matter only below 1e-7 mbar. Proc. Cyclotrons2019 THC04, doi 10.18429/JACoW-CYCLOTRONS2019-THC04, CC-BY 3.0.

    vacuumfabricationmaterialschamberseals

  124. A Compact Permanent Magnet Cyclotron for Accelerator Mass Spectrometry

    D. J. Clark, K. Halbach, W. B. Kunkel, K. N. Leung, C. Y. Li, A. T. Young · 1995 modern relevance 5 · hands-on 3 JACoW ↗

    The definitive paper on the LBNL Cyclotron Mass Spectrometer, the strongest published precedent for a compact permanent-magnet cyclotron. A 1 T, 30-cm-pole, 1.6-cm-gap machine for 50 keV 14C- has its iron poles energized by SmCo magnets in Halbach's crown-and-barrel arrangement, with a deliberately flat (flutter-free) field relying on high-harmonic electrostatic axial focusing. Covers the analytic flux-budget-then-POISSON design workflow, the pole-as-precision-element principle, oversize-then-cut-back shimming, and as-built field maps flat to 7 parts in 1e4 over the 5-12 cm acceleration region. Proc. Cyclotrons'95 (Cape Town) pp. 111-114, no DOI; pre-CC JACoW rights, cite-only with quotes at most 25 words.

    permanent-magnet-cyclotronaccelerator-mass-spectrometryflat-fieldcrown-and-barrel-magnetfield-mappingspiral-inflectorshimming

  125. Development of a Compact Permanent Magnet Cyclotron for Accelerator Mass Spectrometry

    A. T. Young, K. J. Bertsche, D. J. Clark, K. Halbach, W. B. Kunkel, K. N. Leung, C. Y. Li, A. Rawlins, R. D. Schlueter, M. E. Stuart, R. P. Wells, J. X. Yu · 1993 modern relevance 4 · hands-on 2 JACoW ↗

    The PAC1993 companion design paper for the LBNL Cyclotron Mass Spectrometer, written while the machine was under construction (all major subassemblies fabricated except the spiral inflector). Same parameter set as the 1995 paper but with the design-stage view: POISSON predictions of plus-or-minus 2e-4 uniformity through the acceleration region (1e-4 over most of the trajectory), the PM-in-contact-with-iron-pole magnetization scheme, axial injection rationale, and the multicusp C- source program. Quotes an early 1500 V per turn working figure against the later paper's 500 V, useful for tracking design evolution. PAC1993 pp. 1727-1729, no DOI on the paper; IEEE personal-use copyright, cite-only with quotes at most 25 words, paraphrase-lean.

    permanent-magnet-cyclotronaccelerator-mass-spectrometryaxial-injectionspiral-inflectorPOISSON-modelingmulticusp-source

  126. Integrating Permanent Magnets and Electromagnets - A Hybrid Dipole Magnet Design

    Y. Y. Hsu, J. C. Jan, Y. L. Chu, F. Y. Lin · 2025 modern relevance 4 · hands-on 4 JACoW ↗

    NSRRC engineering paper on a hybrid dipole prototype layering four field-control mechanisms: Sm2Co17 blocks (Br above 1.08 T, glued up from small magnetized units) for the main 0.7545 T field, a 42-turn copper trim coil for plus-or-minus 1.25% fine adjustment, outer iron plates on aluminum spacers for coarse percent-class tuning, and Ni30Fe70 shunt plates that roughly halve the 0.043%-per-degree thermal drift. Also documents the safety-engineering side - assembly attraction exceeding several hundred kilograms handled with guided locking fixtures, staged installation, and a reverse bucking field. IPAC2025 WEBD3 pp. 1699-1701, doi 10.18429/JACoW-IPAC2025-WEBD3; CC-BY-4.0, quotes at most 40 words.

    hybrid-magnetpermanent-magnet-dipoletrim-coiltemperature-compensationNiFe-shuntmagnet-assembly-safetySm2Co17

  127. IUAC e-Tender IUAC/NIT/09/GOR/2024-25 — H-Dipole Water-Cooled DC Electromagnet for the Indigenous Table Top Cyclotron Project (technical specification, drawings, acceptance criteria)

    Inter-University Accelerator Centre, New Delhi (technical contact G. Rodrigues) · 2024 modern relevance 5 · hands-on 4 IUAC ↗

    Notice inviting e-tender (dated 2024-08-14) for fabrication and supply of the 1.2 T H-dipole electromagnet at the heart of IUAC's indigenous table-top teaching cyclotron — a machine still in progress with no demonstrated beam, so everything here is design requirement and acceptance methodology, not performance. Annexure A is a complete modern engineering spec for exactly the amateur-scale magnet class — 1.2 T median-plane field, 305 mm poles, 51+/-0.05 mm gap, 64800 A-turns from two 162-turn water-cooled OFHC hollow-conductor coils at 200 A — with iron chemistry/permeability tables, coil winding/brazing/epoxy rules, cooling limits, and thermal interlocks. The acceptance-test structure (factory tests witnessed by IUAC, then site tests at full power) specifies excitation curve 0-220 A in 10 A steps, median-plane field mapping against simulation with dB/B ~18e-3 to r=120 mm, CMM geometry with 50 micron pole parallelism, hi-pot at 1 kV DC, and 24/48-hour stability soaks; the design is disclosed as modelled in CST (3D) and POISSON (2D). Eleven dimensioned fabrication drawings (IUAC/CYCLO/01-11) close the document. Indian government/institutional document — treated cite-only with quotes limited to 25 words. Procurement/bidding boilerplate (roughly pages 1-16 and 30-42) is not corpus material.

    magnetcoilsmaterialsfabricationbeam-measurementproject-managementmodeling

  128. IUAC Annual Report 2024-25, Chapter 3 — Research Support Facilities (table-top cyclotron items)

    Inter-University Accelerator Centre, New Delhi (RF group, mechanical workshop, health physics group) · 2025 modern relevance 4 · hands-on 3 IUAC ↗

    Chapter 3 of the IUAC annual report; only a few pages concern the table-top cyclotron (printed pp. 40, 45, 58-60 = PDF pp. 18, 23, 36-38), the rest covering other IUAC facilities. The cyclotron machine is pre-beam; all content is development status. The RF group section describes the machine's full RF chain under development — broadband solid-state amplifier to 2 kW CW, impedance matching network, GDR digital LLRF, dee/dummy-dee structure, vacuum-variable-capacitor tuning, built-in capacitive pick-up — and the pick-up calibration campaign (shunt impedance, HV-HF probe, bremsstrahlung X-ray endpoint in progress). The mechanical workshop section records two chambers fabricated in-house for the project, and the health-physics table lists the Table Top Cyclotron with AERB licensing status 'Initiated'; civil work for a cyclotron development laboratory is also noted. Indian institutional document — cite-only, quotes limited to 25 words.

    rfdeecontrolschamberfabricationsafetyproject-management

  129. Design and Testing of a Universal Embedded Feedback Controller for RF Cavities (IPAC2026 MOP6698)

    A. Sharma, S. Kar, Y. Dabas, B. K. Sahu, P. Singh, Y. Mathur, V. V. V. Satyanarayana, S. Venkatramanan (IIT Delhi / IUAC) · 2026 modern relevance 4 · hands-on 4 JACoW ↗

    JACoW CC-BY paper on IUAC's universal digital LLRF — one SoC-FPGA hardware set (the digital board cited as the commercial Red Pitaya STEMlab 125-14) reconfigurable across 12.125-97 MHz to serve sawtooth-generator, generator-driven-resonator and self-excited-loop roles without FPGA reprogramming, under EPICS IOC control. For the table-top cyclotron — a machine with no beam yet — the controller was bench-operated in GDR mode with a motorized frequency tuner up to 200 W RF at the machine's 18.2 MHz operating frequency; all cyclotron results are bench tests, not beam performance. Laboratory long-term RMS stability of about 1 percent amplitude and better than +/-0.4 degree phase was recorded, with 35 degree / +/-3 dB correction range verified by injected disturbances. CC-BY rights allow quotes up to 40 words.

    rfcontrols

  130. CAMOST Annual Report 2022-2024 (cyclotron mention)

    Center for Atomic, Molecular & Optical Sciences & Technologies (IIT Tirupati / IISER Tirupati) · 2024 modern relevance 1 · hands-on 0 CAMOST ↗

    Annual report of the CAMOST joint centre; the sole cyclotron content is one bullet on printed p.16 (PDF p.16) stating that a 1.2 MeV proton cyclotron proposed by P. C. Deshmukh is under development at IUAC New Delhi, that the proposal came from CAMOST members and affiliates, and that Tirupati students are expected to intern on the facility. The machine is pre-beam; the 1.2 MeV figure is a stated design energy and sits alongside ~1 MeV-class figures in other coverage of the same machine — a cross-source discrepancy preserved, not resolved. Indian institutional document — cite-only, quotes limited to 25 words. Index-context document; one rule mined.

    cyclotron-generalpedagogy

  131. Rutgers 12-Inch Cyclotron Ion Source Studies: Part II (Ion Source Simulations and Measurements)

    Timothy W. Koeth, Stuart C. Hanebuth, Daniel E. Hoffman, William S. Schneider (Rutgers University, Piscataway, NJ, 08854) · 2007 modern relevance 5 · hands-on 5 NPL ↗

    A December 2007 working note (the sequel to the group's first Ion Source Studies document) reporting how the Rutgers 12-inch student cyclotron diagnosed and cured a large downward ion launch angle at its internal filament/chimney source. A spiraled discoloration left on the copper chimney after a long run gave a 4.3 degree track slope, from which a parasitic vertical electric field of 100 V/cm was estimated; a 2-D Poisson-Superfish electrostatic model confirmed the order of magnitude, and a purpose-bought 3-D E&M particle-tracking code (SIMION), fed a rotated 2-D PSF magnet map plus AutoCAD electrode solids, reproduced the observed first-turn declination. A three-aperture chimney (holes 2.5 mm above and below the median plane, source strengths matched to +/- 7%) deliberately imposed initial betatron amplitudes and produced two photographable betatron traces on the fluorescent screen, agreeing with simulation on a ~9 mm peak vertical displacement at 600 W / 14.90 MHz / 0.977 T. The fixes were an electrically symmetric chimney (including a platinum-sputtered Macor boat) and "pullers" — angled brass plates on the DEE face — which a PSF model showed raised the sheath field 760-fold, predicting a 130-fold Langmuir-Child current increase against a measured ~100-fold. Residual 0.32 mm vertical misalignment of the pullers was identified photographically as the remaining launch-angle source. Beam currents of order 20 microamps on the collector are reported, along with a beam-inferred DEE-voltage calibration and a list of planned but unbuilt source improvements.

    ion-sourcebeam-dynamicsmodelingbeam-measurementdeerffabricationmaterials

  132. Rutgers 12-Inch Cyclotron Electrostatic Deflector

    Timothy W. Koeth, Timothy S. Ponter, Daniel E. Hoffman, William S. Schneider, James E. Krutzler (Rutgers University, Piscataway, NJ, 08854) · 2010 modern relevance 5 · hands-on 5 NPL ↗

    A September 2010 working note (PDF dated December 2011) describing the design, construction, commissioning and first measurements of an internal electrostatic deflection channel on the Rutgers 12-inch student cyclotron, built both to make an absolute beam-energy measurement and as a prototype extraction channel for the group's 19-inch machine. The channel is an E x B spectrometer, a Wien Filter variant that increases rather than straightens the orbit curvature: a 0.005 inch stainless septum and a concentric HV electrode with an average 0.31 inch gap intercept the beam tangentially at a 4.0 inch radius and carry it to 4.5 inches in 43 degrees of azimuth, requiring 4.2 MV/m (33 kV) for protons at 1.0 Tesla. Roughly half the paper is a candid account of high-voltage trouble: internal arcing traced by its pitting pattern to secondary electrons guided along the vertical magnetic field, mitigated with Aerodag-G graphite coating and a clearance slot; and external arcing from the HV cable shield that destroyed a magnet coil, diagnosed as a Blumlein pulse-generator effect and cured only by a 5 megaohm resistor at the chamber bushing after 68 ohm shield resistors failed. Home-made settled P-22 phosphor screens on isolated carriers double as Faraday collectors. Measurements at 28 kV gave the first deflected beam; halving the field to 0.44 Tesla and stepping the deflector voltage in 0.5 kV increments produced a photographic q/m spectrum showing q/m = 1 and q/m = 1/2 species, at harmonic numbers of 2.22 and 4.25 that the authors state are not understood. Estimated channel energy resolution is 25 keV on a nominal 500 keV proton beam (5%), stated as an optimistic bound.

    extractionbeam-measurementdetectorsfabricationmaterialssafetyrfbeam-dynamics

  133. Comparison of Azimuthally Varying with Constant Gradient Magnetic Fields with the Rutgers 12-Inch Cyclotron

    Timothy W. Koeth, George A. Hine, Daniel E. Hoffman, James E. Krutzler, Timothy S. Ponter, Aaron J. Rosenberg, Kiersten J. Ruisard, William S. Schneider (Rutgers University, Piscataway, NJ, 08854) · 2011 modern relevance 5 · hands-on 5 NPL ↗

    A working note from the Rutgers 12-Inch Cyclotron programme comparing constant-gradient (weak focusing) pole tips against two generations of azimuthally varying field (AVF) tips on the same 1.2 MeV proton machine — the same magnet, the same chamber, three pole geometries. It documents a purpose-built computer-controlled X-Y Hall-probe stage, the MatLab analysis code that finds the magnetic centre by minimizing the azimuthal standard deviation of Bz, and an iron-needle field-bump technique for calibrating probe position to the magnet's mechanical centre. Two AVF pole sets are treated: a cheap four-sector pure radial design built only to benchmark the simulation and measurement chain, and AKG270, an optimized four-sector Archimedean spiral sweeping 270 degrees that keeps a weak-focusing central region and aims at isochronism outboard. The simulation chain is SolidWorks to Maxwell 3D to SIMION to MatLab, benchmarked first against the group's older Poisson/Superfish weak-focusing model. Measured and simulated median-plane maps agree within 1% in the ion region and diverge to 14% at the pole tip edge. Beam-dynamics results are given as static trace-space plots at 50 keV steps, including the discovery of four off-centre stable orbits at 250 keV that were then confirmed on the bench with a current-carrying wire loop tossed into the gap.

    magnetbeam-dynamicsmodelingbeam-measurementrffabrication

  134. Report on the 12-Inch Cyclotron Magnet Study: Measurements, Modeling, and Future plans.

    Timothy W. Koeth (Rutgers University, Piscataway NJ 08854) · 2005 modern relevance 5 · hands-on 4 NPL ↗

    The predecessor working note to the 2011 AVF study, written after the Rutgers 12-Inch Cyclotron was found to deliver less than a nanoampere to its periphery because its pole tips had been ground flat and parallel, giving a field with no axial focusing at all. It records the weak-focusing retrofit — a linear tapered 1006-iron pole tip specified for a 2% Bz decrease, implemented as a gap opening from 2.010 to 2.018 inches between r = 0 and r = 5 inches — and derives the Kerst-Serber equations and the 0 < n < 1 stability window from scratch. It then presents measured radial Bz profiles at 20, 30 and 40 A (showing clear iron saturation between 30 and 40 A), a Poisson/Superfish magnetostatic model of the H-frame magnet, and a comparison of the two. The model reproduces the measured radial field shape precisely inside the acceleration region but completely misses the magnet's saturation knee. A final section evaluates whether to move to AVF pole tips and reaches the counter-intuitive conclusion that on a 1.2 MeV, non-relativistic machine plain weak focusing out-focuses unspiralled Thomas focusing by roughly an order of magnitude in nu_z.

    magnetbeam-dynamicsmodelingcoilsbeam-measurementphysics-theory

  135. Observation of Betatron Motion In the Rutgers 12-Inch Cyclotron

    Timothy W. Koeth, Stuart C. Hanebuth, William Schneider (Rutgers University, Piscataway NJ 08854); Daniel Hoffman (Princeton University, Princeton NJ) · 2006 modern relevance 5 · hands-on 5 NPL ↗

    An April 2006 working note documenting the first visible beam in the Rutgers 12-Inch, 1.2 MeV instructional proton cyclotron and the unexpected observation of vertical betatron oscillations on a fluorescent screen. It opens with the history of the 9-inch prototype (parallel pole faces to 0.0001 inch, 50 W RF, 3300 Vp-p dee, ~10 nA at 0.60 MeV) and the disappointment of only fractions of a nA when the 12-inch magnet was installed, traced first to focusing and then to the ion source, whose emission was being suppressed by the dee's high voltage. Sections II and VI give a complete self-contained weak-focusing derivation: field index n, the Kerst-Serber equation, nu_z = sqrt(n), nu_x = sqrt(1-n), the 0 < n < 1 stability band, resonance values to avoid, and a turn-spacing formula Delta_r = Delta_E m /(q B^2 r). Sections III-IV describe Hall-probe field mapping validated against Poisson Superfish, the chimney ion source with a 1/16-inch median-plane aperture, and the replacement of an over-shielded Faraday cup with an unshielded aluminium block plus a -100 dB notch filter. Section V records the operating recipe and the measured betatron peaks at 8.6, 9.2 and 9.6 cm, and section VI reproduces them by piecewise tracking against the modeled n(r). The authors close by attributing the initial vertical offset to a dee/median-plane misalignment in the divergent extraction field and proposing puller electrodes.

    beam-dynamicsmagnetbeam-measuremention-sourcerfdetectorsdeemodeling

  136. Neutron Production with a 12-Inch Cyclotron

    Timothy W. Koeth (no affiliation printed on the title page; the Rutgers 12-Inch cyclotron program, by then relocated to a new laboratory) · 2017 modern relevance 5 · hands-on 5 NPL ↗

    A nine-page working report, updated November 18 2017, describing how the 12-Inch cyclotron was converted from proton to deuteron operation and used to produce neutrons via the d(d,n)He3 reaction on a deuterium-loaded titanium target. The reaction, not the machine, is the neutron source: the author notes the d-d cross section is broadly peaked at a mere 180 keV and produces 2.45 MeV neutrons quasi-isotropically. Halving the RF to 7.15 MHz for q/m = 1/2 required a new external tank inductor for the dee's 78 pF; the amplifier chain runs AFG3101 to ENI-350L to an Ameritron AL-82, with average power limited to about 1000 W by the absence of dee cooling. Target preparation is documented in full — 0.010-inch titanium coupons, tube furnace to 900 C, ~3 hour dwell, backfill to one atmosphere of deuterium, +56 mg mass gain and greater than 220% atomic loading — as is the target's nine-year shelf life between February 2008 and April 2017. Optimum yield was at r = 3 inches (150 keV, 100 nA), the crossover of rising energy and falling current. Detection used a BF3 rem ball (magnetically immune, unlike the PMT-based instruments, which died within two feet of the magnet gap), silver and indium foil activation behind a 45 mm polyethylene moderator, NaI(Tl) and gated HPGe gamma spectroscopy showing the 847 keV iron and 2.22 MeV hydrogen-capture lines, and finally a WL6376A U-235 fission chamber. All the report's radiological figures — 20 mrem/hour average at 25% duty, 80 mrem/hr at 100% duty, and the inferred 10 million neutrons per second peak — are the source's own measurements and inferences for its own geometry, reported here as the source's.

    targetsdetectorssafetyrfion-sourcematerialsbeam-measurementvacuum

  137. DRAFT: Measurement of Neutron Diffusion Time from Fast Pulsed Systems

    Timothy W. Koeth, Luke Gilde, and Scott Moroch (University of Maryland, College Park, MD, 20742) · 2020 modern relevance 4 · hands-on 5 NPL ↗

    A five-page DRAFT report (updated March 7 2020, with an incomplete reference list including a placeholder entry) answering whether 3He detectors and NIM electronics can measure neutron production directly in pulsed systems despite ~10 microsecond deadtimes and pulsed-power transients. The authors argue yes, because the moderator's neutron diffusion time is of order 100 microseconds, leaving a quiescent window after the electrical transient. The 12-inch cyclotron at UMD was run on D+ at 7.150 MHz and 0.96 T with AKG270 spiral poletips and pushed to its shortest pulsed mode yet — 230 RF cycles (30 microsecond drive), 20 microseconds of which is tank ring-up, leaving a 10 microsecond beam-on-target flat top at up to 200 pps. The deuterated target was positioned at r = 0.067 m for a nominal 100 keV incident energy so that only about 5 neutrons per pulse were made and roughly 1 pulse in 250 registered a detection, which is what makes the timing statistics valid. A NIST-calibrated 252Cf source placed at the target face calibrated the 3He detector in situ. An Ortec 567 TAC (1 ms full scale) started by an RF-synchronous TTL and stopped by the 3He NIM pulse, binned by an Ortec EZMca at 512 channels, produced a histogram over 720,000 cyclotron pulses (one hour) fitting to a diffusion time of approximately 94 microseconds. A background run with everything on except the ion source discharge detected no neutrons.

    detectorsbeam-measurementrftargetsshieldingion-source

  138. THE RUTGERS CYCLOTRON: PLACING STUDENT'S CAREERS ON TARGET

    K. Ruisard, G. Hine, T. Koeth (University of Maryland College Park, MD, U.S.A.); A. Rosenberg (Stanford University, CA, U.S.A) · 2013 modern relevance 5 · hands-on 4 JACoW ↗

    Overview-plus-case-study paper on the Rutgers 12-inch cyclotron, a 1.2 MeV student-built educational proton machine: a 12-inch H-frame iron-core magnet at nominally 1 T across a 2-inch gap, a 5-inch radius dee plus dummy dee at up to 10 kV peak and 2-30 MHz, 10E-5 Torr chamber, an internal cold-cathode PIG source, and radial-probe plus deflector diagnostics on phosphor screens. The first half is a student-project timeline from the 1995 conception through weak-focusing pole tips, a home-built 2D Hall-probe field mapper, an RF auto-tuner, the removable deflector and PIG source characterization. The core of the paper is a Spring 2011 semester project that designed azimuthally-varying-field pole tips for edge focusing: fourteen geometries were pushed through a CAD -> 3D field solver -> SIMION tracking loop, and a four-sector Archimedean spiral sweeping 270 degrees won, holding average field flat to ~4% from 1.5 to 4 inches. Measured field maps matched simulation to 14% globally but under 1% within the ion region, and the tips transported beam to the chamber periphery with stronger central focusing than the weak-focusing set. An unexpected result was four off-center stable orbits at 250 keV, predicted in SIMION and then made visible in the gap with a current-carrying wire loop. An earlier radial-sector (non-spiral) AVF set had failed outright because phase slippage at 8 kV dee voltage kept ions from reaching the deflector. The paper closes with program outcomes (18 undergraduates, six accelerator careers, a USPAS course) and a stated plan for a second-generation 19-inch machine around a 1947 General Electric NMR magnet. Note the PDF metadata places first author Ruisard at Rutgers while the printed byline places all but Rosenberg at Maryland; the printed byline is transcribed above.

    magnetbeam-dynamicsmodelingpedagogybeam-measurementrf

  139. RUTGERS 12-INCH CYCLOTRON: DEDICATED TO TRAINING THROUGH RESEARCH AND DEVELOPMENT

    Timothy W. Koeth (IREAP, University of Maryland, College Park, MD, 20742, U.S.A.); Aaron J. Rosenberg, James E. Krutzler, Timothy S. Ponter, William S. Schneider (Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, 08854, U.S.A.); Daniel E. Hoffman (Gas Dynamics Laboratory, Princeton University, Princeton, NJ, 08554, U.S.A.) · 2013 modern relevance 5 · hands-on 5 JACoW ↗ archived Aug 2026

    The hardware paper of the Rutgers set, and the densest one for a builder: after a short program description it documents two student-designed, student-built miniaturized components in enough detail to reproduce them. The first is the "Mark-III" cold-cathode Penning Ion Gauge source, a quarter-coin-sized assembly of two tantalum cathodes pinned to stainless leads in boron-nitride cups seated in copper bases, with a copper chimney and HV lead shields, cooled only by conduction to the chamber lids. It replaced filament sources that gave mere nanoamps and lasted hours. Its DC characterization (dee biased negative as a collector, in a 1 T field) sweeps hydrogen pressure, arc current and aperture size; best arc stability came from the smallest 0.031 inch circular aperture, collected current tracks arc current and extraction voltage roughly linearly, and above 40 mA of arc current the source enters thermal runaway with the chimney visibly incandescent. Practical operation is 5 mA arc, giving over 40 hours between servicing; the usual fault is tantalum flakes shorting a cathode, cleared by scouring with acetone and methanol, and cathodes need replacing after several hundred hours. Rapid RF sweeping showed protons and H2+ generated in a 5:1 ratio. The second component is an electrostatic deflection channel used as a Wien-filter variant to measure absolute beam energy: rho_1 = 7 inches intercepting the beam at 4.0 inches and delivering to 4.5 inches over 43 degrees, with a 0.005 inch grounded stainless septum and an average 0.31 inch gap, needing 33 kV (4.2 MV/m) in a 1 T field. Its commissioning is a case study in in-vacuum HV debugging: arcing near 30 kV, pitting patterns that exonerated field emission and implicated secondary electron emission, an Aerodag-G graphite coating, and finally the discovery that the HV cable beyond the 75 megohm series resistor was acting as a Blumlein pulse generator — cured by a 5 megohm resistor at the chamber bushing. One arc had already destroyed the magnet power supply. Beam on the deflector's P-22 screen resolves individual turns as bands, matched in SIMION by 385/405/425 keV ions, with 10% energy resolution at 500 keV. The printed Princeton ZIP (08554) appears to be a misprint for 08544.

    ion-sourceextractionmaterialsfabricationsafetybeam-measurement

  140. The Construction and Operation of a Nine Inch Cyclotron

    Timothy W. Koeth (no affiliation printed on the document; the acknowledgements name Prof. M. Croft, Prof. M. Gershenson and Prof. J. Pifer, all Rutgers University physics faculty, which places the work in the Rutgers program) · 1999 modern relevance 5 · hands-on 5 NPL ↗

    A nine-page construction and operation report dated September, 1999, plus Appendix 1 (a title page plus seven drawing sheets, PDF pp.11-18; PDF p.10 is an annotated chamber photograph) of hand-drawn detail drawings of the cyclotron chamber and dees, documenting a nine-inch pole proton cyclotron built as an explicit feasibility study before committing to a twelve-inch machine aimed at one million volt protons. The magnet is a repurposed Varian V-3400 NMR H-frame mounted sideways for a horizontal gap, re-poled with 1020 steel cylinders to nine inch diameter and a 2.1875 inch gap, capable of 1.2 Tesla and operated at 0.889 Tesla to suit a 13.56 MHz RF system. The RF is MOPA: an HP8165 synthesiser driving an ENI 350L 100 watt solid state amplifier into a home-built transmatch that uses the dee's own ~70 pF as the tank capacitor, with a measured loaded Q of 150 against an unloaded Q of about 1600. The internal ion source is a W-Th-Ir filament on the face of the grounded dummy dee, biased at -320 VDC, with hydrogen admitted through a calibrated leak to an optimum 5.5E-5 Torr. Beam was detected on an RF-shielded Faraday cup on a two-inch radial linear feed-through and on a gold-metallised phosphor flag; the reported run 91699C achieved 184 keV protons at 7.0 cm radius on 16 watts of forward RF power. The report also records two instructive surprises: magnet pole attraction squeezing the chamber lids and detuning the RF tank, and spurious low-field beam peaks caused by harmonic modes of the tank circuit rather than contaminant ion species.

    magnetrfdeevacuumchamberion-sourcebeam-measurementdetectorsfabricationmatchingbeam-dynamicscyclotron-general

  141. A New Design of PET Cyclotron

    O. Karamyshev (JINR, Dubna, Russia) · 2022 modern relevance 2 · hands-on 3 JACoW ↗

    IPAC2022 conference paper (THPOMS016) presenting the RC3/6 concept as a compact, low-power 15 MeV H- cyclotron for PET isotope production. The machine uses three wide (90-degree) magnet sectors with ~30-degree valleys and accelerates at the 6th harmonic, so a 1.55 T mean field sets the RF at 145 MHz, placed by the author inside the 144-146 MHz amateur allocation. The paper argues that the three-sector/high-harmonic pairing benefits both subsystems: wide hills give a high mean field with only 27,000 ampere-turns (iron kept below Steel 1010 saturation, 25 kW magnet power), while the narrow valleys house compact double-gap delta cavities (30-50 kV, ~8 kW). It gives coil construction details (double-pancake hollow conductor, water flow and temperature rise), a CST field model with flutter and CORD tune curves, 3-D field-map tracking (about 120 turns, no losses reported), a central region in which a PIG source at 7.5 kV pre-accelerates ions into a grounded cup before the first gap, a vacuum system using the magnet as chamber wall (2-5 x 10^-7 Torr expected with three turbo pumps), and stripping-foil extraction. The introduction lists the author's reasons for preferring resistive over superconducting coils. It is a design concept with simulation, not a built or measured machine.

    magnetrfcoilsbeam-dynamicsvacuumion-sourceextraction

  142. Magnetic Field Calculations of a 10 MeV High Current Compact Cyclotron

    V. S. Pandit (Variable Energy Cyclotron Centre, Kolkata, India); P. Sing Babu (Variable Energy Cyclotron Centre, Kolkata, India); A. Goswami (Variable Energy Cyclotron Centre, Kolkata, India); P. R. Sarma (Variable Energy Cyclotron Centre, Kolkata, India) · 2007 modern relevance 2 · hands-on 3 JACoW ↗

    APAC 2007 conference paper (WEPMA005) on the main-magnet design of VECC's 10 MeV, 5-10 mA compact four-sector proton cyclotron, developed under the DAE accelerator-driven-systems programme with a 2.45 GHz microwave source, axial injection through a spiral inflector at 100 keV, two ~45-degree delta resonators and electrostatic extraction. The paper sets out a staged magnet design method: hard-edge approximation with a transfer-matrix tune calculation (including a soft-edge correction because vertical focusing is sensitive to the hill-valley fringe field), 2-D POISSON for primary sizing, then 3-D field optimisation by varying the sector angular width with radius (16-34 degrees). Key choices are a 1.5 T hill / 0.15 T valley field, 4 cm hill and 64 cm valley gaps, a low 0.689 T average field and a large ~65 cm extraction radius to obtain turn separation (stated as costlier but better for injection and extraction), and a vertical tune above 0.5 at all radii to handle space charge at ~5 mA. Equilibrium-orbit optimisation with GENSPEO holds the integrated phase excursion within +/-10 degrees. Table 1 summarises the optimised magnet (72 cm pole radius, 25 t iron). It is a design study; the central region and RF were still in progress.

    magnetbeam-dynamicsmodelingextractionspace-charge

  143. Breakdown in hydrogen and deuterium gases in static and radio-frequency fields

    I. Korolov (Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest); Z. Donkó (same institute) · 2015 modern relevance 2 · hands-on 3 arXiv ↗

    A combined measurement and Monte Carlo study of electrical breakdown in hydrogen and deuterium between plane-parallel stainless-steel electrodes (7.5 cm diameter, 1 cm gap) in a glass cell, under DC and 13.56 MHz RF excitation from a push-pull 6146B oscillator, at pressures up to 30 Torr (arXiv preprint of Phys. Plasmas 22, 093501). The DC Paschen curve of H2 (voltage-ramp and low-current-limit methods agree) has its minimum at (pL)* = 1.2 Torr cm and 290 V; D2 matches at high pressure but sits about 25 V higher at the minimum and well above H2 at low pL. The measured DC curve fixes an effective secondary-electron yield as a function of E/p, which feeds an electron-only RF simulation. The RF breakdown curve is lower than DC and multi-valued: a minimum near pL = 3 Torr cm, turning points B and C, and a steep rise at lower pL once the electron oscillation amplitude approaches the gap and surface processes take over; the multi-valued branch is measured by raising pressure at fixed voltage. With an effective yield of 0.008 and electron reflection 0.2 the simulation reproduces the hydrogen curve; lower frequency (Githens' 11 MHz data) shifts the turning point to higher pL; another laboratory's 2 cm data differ by a factor of 1.8 at the minimum. The deuterium cross-section set used does not reproduce the measured D2 curve.

    rfphysics-theoryvacuumion-source

  144. 72 MHz Solid-State Amplifier Power Test

    A. Smirnov, E. Ivanov, A. Krasnov, S. Polikhov, I. Rezanov, G. Sharkov (Siemens Research Center LLC, Moscow, Russia) · 2014 modern relevance 3 · hands-on 4 JACoW ↗

    IPAC2014 paper (WEPME008) reporting power tests of the first prototype of an 18 kW, 72-73 MHz solid-state RF source intended to upgrade 11 MeV H- PET-isotope cyclotrons. The generator, in a single 19-inch cabinet, combines nine class-AB LDMOS power-amplifier modules (up to 2 kW each, 48 V supply, 51 dB gain, 50 Ohm in and out) in a 9-to-1 combiner, with per-module telemetry (supply voltage and current, drive level, forward/reflected power) and a control system that tracks the cavity resonance by retuning the generator frequency. A single module reached about 75 % efficiency into a matched load without a circulator, but CW operation was blocked by local overheating (115 C) of the single-stage planar transformer that matches the ~1 Ohm transistor output to 50 Ohm; a pre-matching stage is the proposed fix, and tests were derated to 1800 W in 5 ms pulses at 20 % duty. The central experiment drives a Q = 2600 quarter-wave coaxial test resonator through trombone phase shifters with and without a circulator, recording forward, reflected and cavity-probe waveforms for six line-length phases using 50 µs pulses (fill time nearly 10 µs); the module handled full reflection at every phase, with longer fill/decay and higher reflection at some phases. The full system delivered 13.5 kW pulsed at 50 % wall-plug efficiency, but the combiner's 14-16 dB inter-port isolation caused module cross-talk and parasitic oscillation, forcing circulators that cost 15 % of power and efficiency. Note: part of the text layer is font-garbled (shifted characters); the rendered page reads correctly.

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  145. Hybrid Configuration, Solid State-Tube, Revamps an Obsolete Tube Amplifier for the INFN K-800 Superconducting Cyclotron

    A. Caruso, F. G. Caruso, A. Longhitano, A. Spartà (INFN-LNS, Catania, Italy); J. Sura (Warsaw University, Warsaw, Poland); G. Primadei (CERN, Geneva, Switzerland) · 2016 modern relevance 3 · hands-on 4 JACoW ↗

    Cyclotrons2016 paper (WEB02) describing how INFN-LNS replaced the obsolete first-stage tetrode (Thales RS1054L) of one of the three 15-50 MHz RF power amplifiers of its K-800 superconducting cyclotron with a commercial or in-house solid-state amplifier. The original chain is a 200 W, 50 dB wideband class-A solid-state driver followed by two tetrode stages (about 14 and 16 dB; 75 kW maximum, operated at 30 kW to extend tube life). The authors compare a conservative tube-for-tube replacement (CPI 4CX3500A, with socket, bias and matching rework) against solid state, citing end-of-production notices on short warning, last-tube prices near 60 kEUR, and an emptying tube market in their frequency and power range. The adopted solution is a 50 Ohm solid-state stage feeding a tunable matching box: an L-type (Gamma) network of two 10-1000 pF variable vacuum capacitors and a series inductor that transforms 50 Ohm to the low real part of the second-stage tetrode's cathode impedance, with the matching formulas given in Fig. 7. The box was tuned manually across 15-50 MHz; the example at 43.61 MHz shows VSWR 1.0137 on a 1 MHz span. Mismatch up to 2.0:1 was tested, the stage worked with tetrode, MOSFET, BJT and LDMOS drivers from several makers (including an in-house BLF188XR amplifier), and 20-30 kW reached the cavity. The authors report lower revamp and maintenance cost and plan automatic tuning of the matching network. The prototype has run with the cyclotron since January 2015.

    rfmatchingproject-management

  146. Progress at Varian's Superconducting Cyclotrons: A Base for the ProBeam Platform

    H. Röcken, M. Abdel-Bary, E. Akcöltekin, P. Budz, M. Grewe, F. Klarner, A. Roth, P. vom Stein, T. Stephani (Varian Medical Systems Particle Therapy GmbH, Bergisch Gladbach, Germany) · 2013 modern relevance 2 · hands-on 3 JACoW ↗

    Cyclotrons2013 paper (MOPPT012) on the production and factory commissioning of Varian's 250 MeV superconducting ProBeam proton-therapy cyclotrons. Most of the paper concerns cryogenic cool-down (LN2 pre-cooling then about 1,000 litres of LHe, about five days), factory beam commissioning in a test cell at a few nA, extraction efficiency (about 40 % in the factory, about 80 % on site) and coil-tilt correction of the extracted beam position. The RF content is short but specific. The resonator is conditioned for about 100 h of pulsed and CW operation, stepping up to nearly 120 kW. Power comes from a Cryoelectra solid-state amplifier of 120 modules of 1.25 kW at 72 MHz, each module using four LDMOS transistors driven at about 60 % of their maximum power capability. The authors state that below 100 MHz circulator protection becomes difficult and no standard components are commercially available, so transistor reflection hardness decides conditioning time and reflection-related downtime; compared with their earlier tetrode amplifiers they raised the reflected-power protection threshold from 5 % to 10 % of maximum forward power, which significantly shortened initial cavity processing. Amplitude and phase loops run in an FPGA digital LLRF that digitises the pickup-loop signals and also hosts pulse processing and machine-protection functions. Only the RF content was mined for the rules corpus.

    rfcyclotron-generalcontrols

  147. Fabrication and Tests of a RF Cavity for a Novel Compact Superconducting Cyclotron for Radioisotope Production

    D. Gavela, J. Calero, L. García-Tabarés, P. Gómez, D. López, D. Obradors-Campos, C. Oliver, J.M. Pérez Morales, I. Podadera, F. Toral (CIEMAT, Madrid, Spain); B. Bravo, R. Fos, J.R. Ocampo, F. Pérez, A. Salom, P. Solans (ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain) · 2017 modern relevance 3 · hands-on 4 JACoW ↗

    IPAC2017 paper (THPVA062) on the fabrication and RF testing of the 60 MHz quarter-wave cavity for AMIT, an 8.5 MeV, 10 uA H- cyclotron with a 4 T superconducting weak-focusing magnet. The cavity carries a 180-degree dee on a copper stem and must hold 60 kV across a small gap inside the magnet aperture. Fabrication covers a 316L stainless shell with 0.1 mm electro-deposited copper, bolted and pinned copper stem/dee/puller with Sn-Ag soldered contacts, tolerances of a few hundredths of a millimetre, Ra 0.8 surfaces (stricter where fields reach 24 MV/m, 2.6 Kilpatrick), and 3 mm water-cooled copper liners. Low-power VNA work set the input coupling loop by rotation to a coupling factor near 1 (minimum reflection with negligible beam), then measured tuner range 60.150-60.375 MHz, loaded Q 2,333, unloaded Q 4,763 and coupling 1.042; the pickup calibration and 303 kOhm shunt impedance came from combining these with a simulated R/Q, predicting 5.93 kW forward and 32.0 dBm pickup at 60 kV. Q0 was 9.3 % below simulation, against a usual 20-30 % shortfall. After a 13-day bake-out, about 100 h of CW conditioning with a solid-state amplifier (four 2 kW modules, 8 kW) and a 1.1 T magnet at the cavity centre reached 67.1 kV at 8.43 kW; the field reduced multipacting and arc rate, a reverse-power fast interlock stopped about 100 arcs, and the final arc rate was below 1 per hour. The cavity also held 64 kV with 10 sccm hydrogen flow.

    rfdeefabricationbeam-measurement

  148. Design of a Digital Low-Level RF System for Best Medical Cyclotrons

    G. Gold (Best Cyclotron Systems Inc., Vancouver, Canada); V. Sabaiduc (Best Cyclotron Systems Inc., Vancouver, Canada) · 2013 modern relevance 3 · hands-on 4 JACoW ↗

    Cyclotrons2013 (Vancouver) conference paper TUPPT024 describing the digital low-level RF (LLRF) controller Best Cyclotron Systems Inc. designed for its family of medical cyclotrons. The controller is a self-contained 19-inch rack module: an analog front/back end mixes signals to an intermediate frequency with I/Q demodulation and modulation, an Altera Cyclone III FPGA on a digital control card handles the fast functions (amplitude loop, spark recovery, interlocks, data-converter set-up), and a Blackfin microcontroller handles the RF-drive state machine, tuner motor drivers, host-PC link over TCP/IP and the automatic frequency control loop. The operating frequency is switch-selectable over 49-80 MHz, and a master/slave arrangement phase-locks two independently driven resonators, with phase control also offered as a way to pulse or reduce the beam during commissioning. The paper's most transferable content is its control procedures: a four-step automated start (pulse at 20 % of full power until the read-back passes 15 %, go CW and enable spark recovery and tuning, close the amplitude loop, ramp to full power), spark detection by a ~1 µs voltage collapse with a pause-off-refill-resume recovery that restores regulation in about 100 µs, a PI amplitude loop with overshoot protection and anti-windup starting at a 20 kHz cutoff, and a ~100 Hz phase-offset tuner loop. Commissioning on a single-resonator cyclotron passed an eight-hour automated stability test; the 5 x 10^-4 amplitude stability figure is stated as a target.

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  149. Operational Experience in the Treatment of Ocular Melanomas with a New Digital Low-Level RF Control System

    T. Fanselow (Helmholtz-Zentrum Berlin, Germany); J. Bundesmann (Helmholtz-Zentrum Berlin, Germany); A. Denker (Helmholtz-Zentrum Berlin; also Beuth Hochschule fuer Technik Berlin, Germany); U. Hiller (Helmholtz-Zentrum Berlin, Germany); J. K. Abraham (iThemba LABS, Somerset West, South Africa); J. L. Conradie (iThemba LABS, Somerset West, South Africa); W. Duckitt (iThemba LABS, Somerset West, South Africa) · 2019 modern relevance 2 · hands-on 3 JACoW ↗

    Cyclotrons2019 (Cape Town) conference paper TUP007 on replacing the 1970s analogue low-level RF electronics of the HZB K=132 cyclotron, which delivers a 68 MeV proton beam for ocular-melanoma therapy, with the digital LLRF control system developed by W. Duckitt at iThemba LABS. The machine has two RF systems with 30 kW tube amplifiers (100 kW tubes) whose original 1 kW tube drivers had already been replaced by 2 kW semiconductor amplifiers; it operates at 10-20 MHz (therapy at 19.3187 MHz, 115 kV amplitude). The paper describes the retrofit as a project: five LLRF modules synchronised by a distributed reference frequency and 10 MHz clock, Beckhoff EtherCAT modules for motion control and analogue/digital signals, Linux servers with an EPICS interface, and patch panels carrying every RF, analogue and interlock signal so that old and new controls could be swapped quickly after all levels had been measured and matched with amplifiers and attenuators. Commissioning took one week rather than the planned two, seeded from the old system's tuning point. Two years of operation gave easier automatic resonance search on cold start, phase stability improved from 0.1 to 0.02 degree (the amplitude figures are printed as 0.5 % to 0.7 %), and one loop instability after a frequency change, traced to the power amplifier's output-stage tuning and cleared by temporarily lowering the phase loop's integral gain. The therapy context is background only.

    controlsrfproject-management

  150. Calibration of Measurement of Absolute Dee Voltage for U-400M Isochronous Cyclotron at FLNR JINR

    A. T. Issatov (FLNR JINR, Dubna, Russia; also L.N. Gumilyov Eurasian National University, Astana, Kazakhstan); R. K. Kabytayeva (FLNR JINR, Dubna, Russia; also L.N. Gumilyov Eurasian National University, Astana, Kazakhstan); I. A. Ivanenko (FLNR JINR, Dubna, Russia); I. V. Kalagin (FLNR JINR, Dubna, Russia); S. V. Mitrofanov (FLNR JINR, Dubna, Russia); Yu. G. Teterev (FLNR JINR, Dubna, Russia) · 2018 modern relevance 3 · hands-on 4 JACoW ↗

    RuPAC2018 (Protvino) conference paper TUPSA31 reporting an absolute calibration of the dee-voltage pick-up electrodes of the FLNR JINR U-400M isochronous cyclotron (11.5-24 MHz, design dee voltage 130 kV, eight pick-up electrodes per dee) by the bremsstrahlung X-ray endpoint method. The authors argue that pick-up measuring circuits are convenient operationally but unreliable across the frequency range and must be calibrated. X-rays from the dee region were measured through a 70 µm titanium window near one resonator with an Amptek XR-100CdTe detector (5 x 5 x 1 mm CdTe on a thermoelectric cooler, efficiency peaking 10-100 keV) and a PX5 digital pulse processor, calibrated with 180Ta to 1.1 keV resolution at 103.6 keV, at 12.8, 13.317, 15.012, 15.1 and 17.5 MHz with at least three voltages per frequency. Background from induced activity of internal parts made the endpoint hard to read, so the maximum energy was found by comparing measured spectra with FLUKA spectra for monoenergetic electrons (140 keV example). Pick-up versus endpoint is linear at each frequency, but at a fixed 55 kV pick-up reading the true voltage varies with frequency; the calibration factor Emax/U(pick-up) falls from about 2.3 to about 1.7 over 12.8-17.5 MHz (figure reading), giving a single calibration graph. A central-region simulation with the Center program shows why it matters: at 85 kV the beam is essentially all lost on internal elements.

    beam-measurementrfdetectorsdeemodeling

  151. Recent Progress on Ion Source of SC200 Cyclotron

    Y. P. Zhao (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China); S. W. Xu (University of Science and Technology of China, Hefei, China); G. Chen (Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China); O. Karamyshev (JINR, Dubna, Russia); G. Karamysheva (JINR, Dubna, Russia); G. Shirkov (JINR, Dubna, Russia); L. Calabretta (LNS-INFN, Catania, Italy) · 2019 modern relevance 2 · hands-on 4 JACoW ↗

    Cyclotrons2019 conference paper (MOP002) reporting bench tests of the hot-cathode internal Penning (PIG) ion source for the SC200, a 200 MeV compact superconducting proton-therapy cyclotron built by ASIPP (Hefei) and JINR (Dubna). The test bench combines a magnet giving up to 1 T around the arc chamber, vacuum, water cooling, power, data collection and gas feed; the extraction electrode sits about 2 mm from the source behind a 4.3 x 1 mm slit, and a bent copper block stands in for a Faraday cup, so the bench reads total extracted ion current. To check filament stability at the machine's field, the group repeated runs at 3 T in an external high-magnetic-field laboratory, although no 3 T results are reported. Two bent-plate filaments are compared: a thin one and one thickened at the base for mechanical strength. At 1 T, 170 V arc and 2 sccm, arc current rises steeply with filament current for both, the thick filament needing roughly 20-30 A more; with extraction at 6-9.5 kV the thin filament at 175 A gave more than 100 uA and was adopted to lighten the heater supply, even though the thick filament at 215 A gave more beam at equal extraction voltage. The authors report that high filament current damages the filament and promotes breakage, showing a fractured thick filament. The abstract states filament lifetime above 100 h; the body shows a 1 h discharge and 0.5 h extraction stability record. It is a short, data-light bench report, valuable for the in-field filament qualification practice and the filament-current sensitivity curves.

    ion-sourcebeam-measurementmaterialsmagnet

  152. Development of a Center Region for New Sumitomo Cyclotron

    N. Kamiguchi (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); H. Oda (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); J. Kanakura (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); Y. Kumata (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); M. Hirabayashi (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); Y. Mikami (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); H. Murata (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); T. Tachikawa (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); N. Takahashi (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); T. Tsurudome (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); H. Tsutsui (Sumitomo Heavy Industries, Ltd., Tokyo, Japan); J. Yoshida (Sumitomo Heavy Industries, Ltd., Tokyo, Japan) · 2019 modern relevance 2 · hands-on 3 JACoW ↗

    Cyclotrons2019 conference paper (TUP035) describing the centre region of a new Sumitomo Heavy Industries superconducting AVF proton-therapy cyclotron with a 3 T field, a 2.8 m diameter yoke and a centre region packed into about 0.2 m diameter. The internal source is a simple hot-cathode PIG with a floating anti-cathode that reflects the thermal electrons. Because the heated filament at 3 T feels a strong Lorentz force from its own current, which the authors expected to deform it, the source was converted to AC filament heating, which they credit with making a hot-cathode PIG usable in that field. On a superconducting test magnet at 3.2 T with static extraction the source gave up to about 300 uA of H+, and the published curve shows a strong dependence on filament current (178 A vs 180 A) at each arc voltage. Filaments are treated as consumables: a mechanical drive under the cyclotron withdraws the source without breaking vacuum. The paper also gives the first-gap arrangement (50 kV between source and puller, first orbits around 15 mm radius), dee and counter-dee electrodes, an electrostatic vertical chopper that dumps unwanted beam within four turns below 1 MeV, phase slits and vertical dumpers, a centre-region probe at 42 mm radius used for Smith-Garren phase measurement and source monitoring, and centring coils exploiting the first field harmonic placed in one valley pair. Component tests were pending at publication.

    ion-sourcebeam-measurementbeam-dynamicsdeemagnet

  153. Cyclotron (US Patent 9,041,318 B2)

    Takuya Miyashita (Niihama, JP; assignee Sumitomo Heavy Industries, Ltd., Tokyo); Kazutomo Matsumura (Tokyo, JP; assignee Sumitomo Heavy Industries, Ltd., Tokyo) · 2015 modern relevance 3 · hands-on 4 Google Patents ↗

    United States patent granted 26 May 2015 to Sumitomo Heavy Industries (filed 4 Sep 2013, Japanese priority 4 Sep 2012) on reversing the direction of the heating current in the filament of a cyclotron's internal hot-cathode PIG ion source. The description explains the source: a conductive chimney with a side extraction slit, a tantalum filament bent from a single plate in an omega (or U) shape inserted from the open lower end, an anti-cathode facing it along the field, hydrogen fed up the support column, and an external extraction electrode. Its central finding is that filament degradation in the 1-3 T field of the machine is caused by deformation under the Lorentz force on the filament current, which acts on the distal curved portion where current crosses the field; the filament weakens because it is hot and progressively thinned by electron sputtering, so the tip gradually falls over and the filament must be replaced. The remedy is a controller that reverses the DC filament current at intervals, optionally adapted to operating conditions or to the detected extracted-ion signal, so the force alternates in direction; AC heating is named as an alternative. The plate's width is oriented along the force for stiffness. The worked example (Ta plate 25 x 5 x 0.5 mm, 200 A DC, 1.75 T, 185 V arc, 4 h of operation) gives about 0.2 mm tip bending with hourly reversal against about 1 mm without, shown as a box plot. The single claim is narrow; the description is the useful part.

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  154. A Permanent Magnet System for a Cyclotron Used as a Mass Spectrometer

    C. Y. Li (Lawrence Berkeley Laboratory, University of California); M. Cooper (Lawrence Berkeley Laboratory); K. Halbach (Lawrence Berkeley Laboratory); W. B. Kunkel (Lawrence Berkeley Laboratory); K. N. Leung (Lawrence Berkeley Laboratory); R. P. Wells (Lawrence Berkeley Laboratory); A. T. Young (Lawrence Berkeley Laboratory) · 1992 modern relevance 4 · hands-on 4 OSTI ↗

    LBL report LBL-32037 (July 1992), the paper submitted to the 13th International Conference on Cyclotrons and their Applications (Vancouver), describing the magnet and vacuum structure of the LBL cyclotron mass spectrometer for 14C. It is the engineering companion to the better-known overview papers on the same machine: a 1 T flat (isochronous) field, 15 cm-radius 1005-steel poles, a 1.6 cm gap, samarium-cobalt blocks in contact with the poles and a cylindrical iron yoke closing the flux. The paper gives the concrete construction choices: the inner pole faces form the vacuum lids with an aluminium spacer ring as the side wall, chosen to minimize the gap and therefore the magnet material; the magnet material is kept out of the vacuum by O-rings and welded tubes; about 200 blocks (about 6000 cm^3) cut and ground from larger stock are glued to the yoke; the pole-rim annulus is filled with rectangular blocks forming an 18-sided polygon aligned on machined ledges; blocks are omitted for penetrations and for coarse field level, the pole smoothing the voids; and rotatable "field tuner" rods carrying radially magnetized blocks give fine field adjustment with no coil current. It also derives the vacuum requirement from the C- stripping cross-section and sizes the extraction radius from the resolution formula R = 3 n H. It is a design report for an instrument then under construction; no measured field or tuner range is reported.

    magnetfabricationvacuumchambercontrolscyclotron-general

  155. Variable-Field Permanent-Magnet Dipole

    David B. Barlow (Los Alamos National Laboratory); Robert H. Kraus Jr. (Los Alamos National Laboratory); Ross E. Meyer (Los Alamos National Laboratory) · 1993 modern relevance 3 · hands-on 4 OSTI ↗

    Los Alamos report LA-UR-93-3237, submitted to the 13th International Conference on Magnet Technology (Victoria, B.C., September 1993). It describes three variable-field permanent-magnet dipoles built and installed for the Los Alamos Advanced Free-Electron Laser beamline: C-shaped sector magnets with low-carbon steel (C-1006) poles separated by a large Sm2Co17 block (remanence 1.05 T), a 2.8 cm by 8 cm aperture and about 10 cm poles. The central field is varied continuously from 0.07 T to 0.3 T by moving an iron shunt across the back of the magnet. The paper explains why a flat shunt gives a steep non-linear tuning curve and how a C-shaped shunt with tapered, saturating tips linearizes it, extends the travel and reduces the force. Design used 2-D FLUX2D for the shunt, pole tips and block size and 3-D TOSCA for the final design; the 2-D model overestimated the central field by about 40% for lack of fringe-field loss. The mechanism (stepper motor, 100:1 reduction, lead screw preloaded by the magnetic pull, brake, limit switches, encoder) is described, as are Hall-probe maps and per-magnet NMR calibration showing reproducibility better than 0.1%. The authors report fabrication cost about 20% below comparable electromagnets with supplies and cooling, and fewer interlocks.

    magnetcontrolsmodelingbeam-measurement

  156. Experience with a NdFeB Based 1 Tm Dipole

    F. Bødker, L. O. Baandrup, N. Hauge, K. F. Laurberg, G. Nielsen, A. Baurichter, B. R. Nielsen (Danfysik A/S, Taastrup, Denmark); H. D. Thomsen, O. Balling, J. S. Nielsen, N. Hertel, S. P. Møller (Aarhus University, Aarhus, Denmark); F. B. Bendixen, P. Valler, P. Kjeldsteen (Sintex A/S, Hobro, Denmark) · 2014 modern relevance 3 · hands-on 4 JACoW ↗

    IPAC2014 paper TUPRO080 reporting a built and operating NdFeB "Green Magnet": a 30-degree, 1 Tm C-type hybrid dipole (1.015 T, 30 mm gap, 1 m long) installed in the ASTRID2 injection line in 2013. Shaped iron poles set the field quality (homogeneity below 0.6 x 10^-3 against a 10^-3 specification) and average out block imperfections and remanence variations; one block size (N48M) and dedicated force-handling tooling let one person mount nearly 500 blocks in a week. Air-cooled trim coils on a 20 A supply give +/-3% adjustment, saving at least 99% of the 4 kW of the equivalent electromagnet. The NdFeB temperature dependence is passively compensated to below 30 ppm/degC over 15-35 degC. Separating the halves for vacuum-chamber installation meant overcoming 90 kN with removable assembly bolts. Field stability was monitored with a fixed-bracket Hall probe (212 +/- 12 ppm over 7 months, within measurement uncertainty; probe tempco -80 ppm/K uncompensated) and dosimetry around the magnet. A radiation study with 100 MeV electrons on N35/N35M samples under controlled reverse bias found the 1% demagnetization fluence rising exponentially with the work-point margin (Hci - Hd)/Hci; Sm2Co17 is noted as about 1000 times more radiation resistant at about 25% lower remanence and twice the mass.

    magnetmaterialsfabricationbeam-measurementsafety

  157. Temperature Compensation of NdFeB Permanent Magnets

    S. H. Kim (Advanced Photon Source, Argonne National Laboratory); C. Doose (Advanced Photon Source, Argonne National Laboratory) · 1997 modern relevance 4 · hands-on 4 OSTI ↗

    PAC97 conference paper issued as Argonne report ANL/ASD/CP-92213 (CONF-970503), five PDF pages of which pages 2-3 are OSTI disclaimer sheets; the archive copy is an image-only scan with a searchable OCR twin kept separately. It reports a passive temperature-compensation scheme for small NdFeB dipoles built with soft-steel poles and flux-return yokes. The blocks (25.4 x 25.4 mm, 12.7 mm thick, Br about 1.1 T, coercive force about 10.5 kOe) gave an uncompensated gap-field coefficient of -1.1 x 10^-3 per degC over 25-45 degC, which the authors attribute to NdFeB's low Curie temperature. Strips of 30%-Ni-Fe alloy (1.27 mm thick in the text, 1.25 mm in the abstract; Curie temperature 60 degC) inserted between the blocks act as parallel flux shunts whose permeability falls as temperature rises. At an optimum strip/NdFeB volume ratio of 20% the coefficient fell below 2 x 10^-5 per degC over 31 +/- 6 degC, but only below 1 x 10^-4 per degC over the full thermal cycle because the strips are nonlinear. Thermal cycling at 0.15 degC/h shifted the compensated field up by about 1 x 10^-4 and the compensation temperature down about 1 degC over the first three cycles, after which it held within 0.1 G and 0.5 degC for seven more. The measurement practice (Hall probes calibrated to 10^-5 of reading per degC, slow incubator ramps) is stated. Ageing and radiation effects are left for further work.

    magnetmaterialsbeam-measurement

  158. Time Dependence and Temperature Stability of the Permanent Magnets for the Fermilab Antiproton Recycler Ring

    B. C. Brown, C. N. Brown, G. W. Foster, W. B. Fowler, H. D. Glass, D. J. Harding, G. P. Jackson, M. P. May, T. H. Nicol, S. Pruss, P. Schlabach, J. T. Volk (Fermi National Accelerator Laboratory) · 1999 modern relevance 3 · hands-on 4 OSTI ↗

    Fermilab report FERMILAB-Conf-99/267, published in the proceedings of the 11th International Magnet Measurement Workshop (Brookhaven, 1999); pages 1-2 are the cover and disclaimer, pages 3-6 the paper. It documents how the strontium-ferrite permanent magnets of the 8 GeV Recycler storage ring were made temperature-stable, longitudinally uniform and characterised over time. A ferrite-only test quadrupole, frozen and slowly warmed, gave 0.18% per degC; strips of Ni30Fe70 compensator alloy (Curie point 45-50 degC) bridging pole and flux return were added, with the volume ratio found empirically per magnet type and strips from different batches mixed at random because the Curie point varied batch to batch. The result was +/-0.01% per degC per magnet, 0.004% rms. High-beta quadrupoles needing ten times tighter stability used heating blankets under feedback at 32 +/- 1 degC. Strength was set by sorting bricks and trimming volume; compensator strip density and aluminium spacers shaped the longitudinal field, and Hall-probe moments set installation positions. A first production magnet measured over about 18 months showed logarithmic field loss of 9.0 x 10^-4 per logarithmic unit of time, extrapolated to 0.35% over 20 years; the stated 0.35% matches a base-10 logarithm although the text names the natural log.

    magnetmaterialsbeam-measurementfabrication

  159. Experiences with Permanent Magnets at the Fermilab Recycler Ring

    J. T. Volk (Fermi National Accelerator Laboratory) · 2012 modern relevance 3 · hands-on 4 arXiv ↗

    Fermilab technical memo FERMILAB-TM-2497-AD (also arXiv:1209.4324; PDF dated 2011), a retrospective on the 484 strontium-ferrite permanent magnets of the Recycler, a 3.3 km, 8 GeV antiproton storage ring chosen as permanent-magnet for low construction and operating cost. It states the production achievement - central field within 1 part in 10^3, temperature stability better than 1 part in 10^4 per degC, harmonics below 1 part in 10^4 - and how each was reached. Gradient magnets used ferrite bricks behind precision pole tips in a 19 mm flux return. Temperature compensation used interspersed Ni30Fe70 strips; since compensation is linear in compensator amount, a 20-fold reduction needs the amount right to 1 part in 20, and every magnet was frozen to 0 degC and measured at 0 and 22 degC to set it. The first production magnet, measured for over ten years, lost 0.35% in three years and then stayed stable, which the author supports with the ring RF frequency drifting under 200 Hz at about 52 MHz. Harmonics up to 12-pole were measured with a rotating coil and corrected by computed end shims cut by wire EDM, usually in one iteration; quadrupoles were trimmed with steel washers. Operation later required added skew-quadrupole and sextupole correctors in ferrite and samarium cobalt.

    magnetmaterialsfabricationproject-management

  160. Production of Low Cost, High Field Quality Halbach Magnets

    S. J. Brooks, G. Mahler, J. Cintorino, A. K. Jain (Brookhaven National Laboratory, Upton, NY, USA) · 2017 modern relevance 4 · hands-on 5 JACoW ↗

    IPAC2017 paper THPIK007 on building NdFeB Halbach quadrupoles and combined-function magnets cheaply and then correcting their field errors with iron-wire shims, as prototypes for the CBETA FFAG return arcs. Six 16-segment quadrupoles (23.6 T/m) and six asymmetric combined-function magnets (19.1 T/m, 0.377 T central field) of grade N35SH were assembled by hammering wedges into a 3-D printed mould inside an aluminium pipe, without tight tolerances or machining. The field model treats blocks as fixed magnetisation with an effective remanence tuned against OPERA-3D. Each assembled magnet was measured on a rotating coil, the measured errors added to the 2-D model, and the radii of 32-64 carbon-steel wires in a printed bore holder optimised by a regularised SVD pseudo-inverse of the harmonic response matrix; the wires were cut from a few stock gauges to matching volume. One iteration reduced error multipoles by about a factor of 4 on average, to 1.2-3.4 units (10^-4 at 10 mm) for the quadrupoles and 3.5-8.7 for the combined-function magnets; a second iteration on a prototype improved further. Strength errors of a few 10^-3 remained, attributed partly to NdFeB's -1.1 x 10^-3 coefficient without temperature control. Costs were about $1,070 and $779 per magnet, almost entirely PM material. The abstract's 1-unit figure is the approachable level, not the measured production result.

    magnetmodelingfabricationbeam-measurement