--- title: "Construction Classics · Cyclotron Info" canonical: https://cyclotroninfo.com/library/classics/ description: "Public-domain cyclotron construction reports from the AEC era, hosted with their rights rationale and page-referenced reading guides for small-machine builders." generated: 2026-11-12 note: "Markdown rendering of the canonical HTML page, generated at build for AI assistants and text tools. Figures and interactive elements are described, not reproduced. On Design Guide rules the source quote, this site's paraphrase and this site's editorial note are labelled separately and must not be conflated." licence: "Datasets CC BY 4.0, census snapshot CC BY-NC 4.0 (https://cyclotroninfo.com/data/); cite as Cyclotron Info, cyclotroninfo.com" --- # Construction Classics The construction-era cyclotron reports — AEC laboratory documents from the 1940s and 1950s that record how real machines were designed, fabricated, and commissioned — survive today as scans scattered across OSTI, DTIC, and archive mirrors. Any of those copies can move or vanish. This collection hosts the ones that are public domain, so the documents the [Design Guide](https://cyclotroninfo.com/design-guide/) extracts its rules from stay readable at a stable address. Each document gets its own page with a full citation, the hosted PDF, a public-domain rationale stating exactly why hosting is lawful, a reading guide keyed to the report’s own page numbers, and links to the design rules extracted from it. Nothing is hosted without a documented rights basis; the copyrighted majority of the [library](https://cyclotroninfo.com/library/) remains cite-only. The shelf is no longer only construction reports. Since October 2026 it also carries the public-domain measurement and standards documents behind the Design Guide’s rules on kilovolt X-ray output, electrons in gas and the hot-filament ion source, some of them journal papers older than the cyclotron itself. The same rights test applies to each, and the documents from the same mining waves that failed it are named on the cluster pages with the reason. One reading rule for the whole shelf. These reports are the record of how the method was worked out, and the method is what transfers; the tooling often does not. Where a report builds a scale-model magnet, a fractional-scale RF system or an analogue machine before committing to metal, that was the only way in its decade to see the answer first — a builder today gets the same answer from a free field solver or an orbit code before any model is built, and the [modelling-tools page](https://cyclotroninfo.com/learn/modeling-tools/) names them. Where a report’s vacuum plant, electronics, instruments or dose limits have since been superseded, the reading guide says so in place. The physics, the formulas and the measured comparisons between prediction and the real machine are what to read these for. ### [Electrons in gas — four documents, 1922–1970](https://cyclotroninfo.com/library/classics/electrons-in-gas/) BSTJ 1922 · Phys. Rev. 1925 · NASA SP-3012 · NASA TN D-6005 1922–70 · Western Electric · Caltech · National Bureau of Standards · NASA Langley What happens to electrons that travel through gas rather than vacuum. Johnson focuses a 300-volt beam with a trace of argon and explains why by ion space charge; Brode measures how strongly each gas removes slow electrons from a beam; Berger and Seltzer tabulate range and X-ray yield from 10 keV up; a Langley wind-tunnel team puts a spectrograph on the glow of a 26 keV beam and finds trace nitrogen doing most of the shining. 178 pages · PDF, four PDFs, 14.8 MB total · 21 design rules cite them ### [Hot-filament arc sources — five documents, 1925–1954](https://cyclotroninfo.com/library/classics/filament-ion-sources/) Smyth 1925 · Hogness & Lunn 1925 · ORNL-1525 · ORNL-1758 · AECU-2907 1925–54 · Princeton · UC Berkeley · Oak Ridge National Laboratory · Ohio State University The component most small cyclotrons share, from three directions. Two 1925 Physical Review papers settle which hydrogen ions an electron-impact discharge makes and which knobs shift the mix; two Oak Ridge calutron reports weigh filaments to find out why they die and show a four-light-bulb ballast that doubles their life; the Ohio State final report writes down the procedure for positioning a filament while watching the beam. 103 pages · PDF, five PDFs, 19.2 MB total · 36 design rules cite them ### [R.F. System for Frequency Modulated Cyclotron](https://cyclotroninfo.com/library/classics/mddc-1045/) MDDC-1045 1946 · University of California Radiation Laboratory The RF system of the first synchrocyclotron — the Berkeley 37-inch FM conversion — at amateur scale: one dee, 5 kW, commercial triodes, and a worked phase-correction analysis. 12 pages · PDF, 1.1 MB · 13 design rules cite it ### [The 184-inch Commissioning Papers, 1946–47](https://cyclotroninfo.com/library/classics/184-inch-commissioning/) MDDC series 1947 · University of California Radiation Laboratory Six declassified memos from the 184-inch’s first year: the beam that stopped at 82 inches, the experiments that found out why, and the fixes that failed — raw commissioning logs, the scarcest content class. 42 pages · PDF, six PDFs, 1.3 MB total · 13 design rules cite it ### [Character of the Radiation Field and Shielding at the 184-Inch Cyclotron](https://cyclotroninfo.com/library/classics/aecd-2149/) AECD-2149 1947 · University of California Radiation Laboratory The collection’s first MEASURED shielding source rather than a method: half-value thicknesses for six materials taken with the cyclotron itself as the neutron source, the composite-layer result that paraffin behind lead doubles the reading, and a dose map normalised to beam current. B. J. Moyer later gave his name to the Moyer model. 6 pages · PDF, 1.1 MB · 10 design rules cite it ### [Design of the Radio-Frequency System for the 184-inch Cyclotron](https://cyclotroninfo.com/library/classics/ucrl-64/) UCRL-64 1948 · University of California Radiation Laboratory The design history of the 184-inch RF system by the four engineers who built it, written so that "others designing frequency-modulated oscillators" could reuse the reasoning. 47 pages · PDF, 9.6 MB · 13 design rules cite it ### [Beam extraction hardware — four reports, 1948–1963](https://cyclotroninfo.com/library/classics/extraction-hardware/) UCRL-95 · UCRL-3476 · UCRL-8578 · UCRL-10655 1948–63 · UC Radiation Laboratory · Lawrence Radiation Laboratory Fifteen years of Berkeley answering the hardest question in a small build four ways: a sixteen-thyratron deflector pulser, regenerative extraction theory, RF-driven extraction, and a supply that limits the energy of each spark rather than trying to prevent it. 94 pages · PDF, four PDFs, 13.3 MB total · 27 design rules cite them ### [Knowing before building — four reports, 1947 and 1961](https://cyclotroninfo.com/library/classics/model-and-computation/) AECD-1850 · UCRL-31 · MSUCP-9 · MSUCP-12 1947–61 · UC Radiation Laboratory · Michigan State University One question answered two ways fourteen years apart. The 1947 pair is a proposal and its verification three months later: MacKenzie sets out the “three quarter wave” RF system, then Anderson reports the half-scale model tests of it. Plus two 1961 MSU computations — resonant-extraction optics by orbit tracking, and analytic dee field formulas that are size-independent. 127 pages · PDF, four PDFs, 20.1 MB total · 47 design rules cite them ### [General Recommendations for Design of Small Cyclotrons](https://cyclotroninfo.com/library/classics/ucrl-476/) UCRL-476 1949 · University of California Radiation Laboratory The only report written for someone about to build a small cyclotron — a design cookbook with a working 6-inch machine as the example. 18 pages · PDF, 3.0 MB · 32 design rules cite it ### [Magnets and Magnetic Measuring Techniques](https://cyclotroninfo.com/library/classics/tid-5215/) TID-5215 1949 · UC Radiation Laboratory, Berkeley A 226-page AEC volume about magnets and nothing else, from the laboratory that had built more cyclotron magnets than anywhere on earth. Four chapters: design requirements, measuring instruments and technique, MODEL magnets and their performance, and tests on full-scale magnets. The model-magnet chapter answers a question this collection had been chasing through undigitised reports. 226 pages · PDF, 52 MB, served from files.cyclotroninfo.com · recovered August 2026, not yet mined for design rules ### [Design and Construction of Synchro-Cyclotron](https://cyclotroninfo.com/library/classics/nyo-780/) NYO-780 1950 · Carnegie Institute of Technology One institution building one synchrocyclotron from scratch — model magnets, coil winding, leak testing, oscillator debugging, shielding — in a single final report. 84 pages · PDF, 6.7 MB · 23 design rules cite it ### [The University of Washington 60-Inch Cyclotron](https://cyclotroninfo.com/library/classics/aecu-1951/) AECU-1951 1951 · University of Washington A construction record, the scarcest class here: a 60-inch machine for 20 MeV deuterons, documented from buildings through magnet to vacuum system. Built deliberately from Berkeley’s Crocker cyclotron drawings, supplied by E. O. Lawrence — a documented case of copying a machine known to work rather than originating a design. Half its concrete building is buried. 128 pages · PDF, 35 MB, served from files.cyclotroninfo.com · recovered August 2026, not yet mined for design rules ### [Cyclotron Component Design Technical Reports](https://cyclotroninfo.com/library/classics/tid-454/) TID-454 1952 · Carnegie Institute of Technology The engineering behind NYO-780, under the same ONR contract: seven technical reports on magnets, vacuum, frequency modulation, RF and extraction timing — including the collection’s only cost-minimised magnet design, optimised against the unit cost of steel, copper and ten-year energy. 186 pages · PDF, 33.7 MB, served from files.cyclotroninfo.com · 45 design rules cite it ### [The 22-inch test cyclotron — seven reports, 1951–1955](https://cyclotroninfo.com/library/classics/test-cyclotron/) ORNL-1269 · 1383 · 1531 · 1663 · 1670 · 1795 · 1884 1951–55 · Oak Ridge National Laboratory Consecutive progress reports following ONE small cyclotron for three and a quarter years — first resolved proton orbits, a rename from 22-inch to 44-inch when the magnet was reworked, a rebuild for 100 kV dees and dual-radius running, then assembly. Includes the contractor’s brazing errors and the funding delays. 256 pages · PDF, seven PDFs, 35.6 MB total · 39 design rules cite them ### [The Oak Ridge 86-Inch Cyclotron](https://cyclotroninfo.com/library/classics/ornl-1196/) ORNL-1196 1952 · Oak Ridge National Laboratory The most complete construction-and-commissioning record in the open literature: excavation to milliampere beams in two years, every subsystem documented and costed. 145 pages · PDF, 13.0 MB · 27 design rules cite it ### [Targets and the target plane — three reports, 1952–1961](https://cyclotroninfo.com/library/classics/targets/) ORNL-1347 · ORNL-1348 · ORNL-3021 1952–61 · Oak Ridge National Laboratory The target plane end to end: a bench recipe for self-supporting boron and magnesium films at tens of µg/cm², and two methods for measuring the beam that hits them — including the finding that internal beam energy can sit ±10% off the value calculated from field and radius. 33 pages · PDF, three PDFs, 1.1 MB total · 15 design rules cite them ### [Commissioning Practice — three reports, 1952–1966](https://cyclotroninfo.com/library/classics/commissioning/) ORNL-1339 · ORNL-1345 · UCD-CNL-49 1952–66 · Oak Ridge National Laboratory · Crocker Nuclear Laboratory What happens after first assembly: two consecutive Oak Ridge quarterlies logging three cyclotrons commissioned side by side — including a 63-inch holding 75 kV dee-to-dee against a 60 kV design — plus a study of retrofitting an axial ion source into a working machine. 70 pages · PDF, three PDFs, 3.4 MB total · 36 design rules cite them ### [Studies with a Three-Dee Three-Phase Proton Cyclotron](https://cyclotroninfo.com/library/classics/ucrl-3187/) UCRL-3187 1955 · UC Radiation Laboratory The closest size match the repository searches have found: a 20-inch machine built around a magnet that was already available, where moving the ion source off centre doubled the beam and two independent current measurements were made to disagree in public. 18 pages · PDF, 3.2 MB · 8 design rules cite it ### [RF Power Engineering — four reports, 1955–1965](https://cyclotroninfo.com/library/classics/rf-power/) UCRL-9435 · UCRL-3153 · ORNL-2403 · COO-535-543 1955–65 · UC Radiation Laboratory · Oak Ridge · University of Colorado How to drive the dees, from three directions: a three-phase system for three-dee machines, an argument that the accelerating waveform should be a square wave rather than a sine, and a power amplifier rebuilt around a ceramic tetrode. 93 pages · PDF, four PDFs, 10.5 MB total · 24 design rules cite them ### [Residual radiation and personnel dose — two reports, 1958–1961](https://cyclotroninfo.com/library/classics/residual-radiation/) UCRL-8276 · ORNL-3158 1958–61 · Crocker Laboratory · Oak Ridge National Laboratory What a running cyclotron leaves behind, measured rather than estimated: the activation products a machine structure becomes, nuclide by nuclide and alloy by alloy, and five years of film-badge dose for the crew who had to walk up to the target. 38 pages · PDF, two PDFs, 3.0 MB total · 11 design rules cite them ### [The Rochester 27-inch — five reports, 1954–1962](https://cyclotroninfo.com/library/classics/rochester-27-inch/) NYO-9359 · NYO-9358 · NYO-3823 · NYO-9683 · NYO-9360 1954–62 · University of Rochester One 27-inch university machine across eight years, both halves of its life. Two machine reports — a spark gap that starts an oscillator stuck below its multipactor band, and a hooded arc source that makes more ions from less filament — and three on what came after: external-beam focusing and analysis, a broad-range spectrograph, and fast-neutron time-of-flight. The same laboratory that published a spectrograph also had to publish a note about a spark gap. 128 pages · PDF, five PDFs, 11.0 MB total · 53 design rules cite them ### [The Oak Ridge Relativistic Isochronous Cyclotron](https://cyclotroninfo.com/library/classics/ornl-2648/) ORNL-2648 1958 · Oak Ridge National Laboratory The ORIC design study by Blosser, Cohen, Gordon, and Welton — the report that established the model-magnet method behind every modern AVF cyclotron. 134 pages · PDF, 7.0 MB · 10 design rules cite it ### [Cyclotrons and High-Energy Accelerators — 1958](https://cyclotroninfo.com/library/classics/ornl-2644/) ORNL-2644 1958 · Oak Ridge National Laboratory The 1958 world accelerator census: standardized magnet, RF, vacuum, and beam data sheets for 140 machines — what everyone else chose, in one public-domain volume. 317 pages · PDF, 18.6 MB · 13 design rules cite it ### [The Argonne 60-Inch Cyclotron](https://cyclotroninfo.com/library/classics/anl-5907/) ANL-5907 1959 · Argonne National Laboratory A terse system-by-system record of a mature workhorse, with acceptance specs, measured tolerances, and the collection’s only suppliers-and-fabricators list. 40 pages · PDF, 12.7 MB · 8 design rules cite it ### [X-ray output below 100 kV — four documents, 1961–1978](https://cyclotroninfo.com/library/classics/xray-output/) NBS Handbook 76 · BRH/DEP 70-1 · NBS Handbook 111 · FDA 79-8071 1961–78 · National Bureau of Standards · Bureau of Radiological Health How many X-rays an evacuated gap with kilovolts across it makes, measured. A 1970 federal survey of classroom discharge tubes, including the ones not meant to emit, read at 1 to 16 ft; a 1978 compendium of tungsten-tube output and spectra at 20–60 kVp; the 1961 handbook that wrote down the barrier equation and the lead transmission curves behind it; and the 1972 analytical-equipment standard on gassy rectifiers, pinhole leaks and meters that read low. 252 pages · PDF, four PDFs, 11.8 MB total · 31 design rules cite them ### [Electrical Design of Electrostatic Deflectors for Sector-Focused Cyclotrons](https://cyclotroninfo.com/library/classics/ucrl-10654/) UCRL-10654 1963 · Lawrence Radiation Laboratory The measured basis for beam extraction — long the thinnest subject in this collection, and the report that started closing it. Electrode materials ranked by spark damage, the VE relationship, a stated design derating, and the tungsten-versus-carbon septum trade, all from the 88-Inch Cyclotron. 38 pages · PDF, 4.7 MB · 14 design rules cite it ### [A Proposal for the Mc² Isochronous Cyclotron](https://cyclotroninfo.com/library/classics/ornl-3540/) ORNL-3540 1963 · Oak Ridge National Laboratory A complete engineering design for a machine never built: an 810 MeV eight-sector isochronous cyclotron, worked to construction standard across fourteen chapters — including shielding, costs and schedule, the sections almost no accelerator document contains. 327 pages · PDF, 26.5 MB, served from files.cyclotroninfo.com · 36 design rules cite it ### [Operations records — two reports, 1964 and 1970](https://cyclotroninfo.com/library/classics/operations-records/) NRL-MR-2103 · Harvard Cyclotron Laboratory quarterly 1964–70 · Naval Research Laboratory · Harvard University Two machines being run rather than built. NRL accounts for every hour of six months: 60.1% operating, and power supplies and vacuum together taking twelve times more time than the RF. Harvard opens on four days lost to a cold-trap refrigerator and low diffusion-pump oil. Nobody writes an operations report to be instructive, which is what makes them worth reading. 49 pages · PDF, two PDFs, 2.5 MB total · 20 design rules cite them ### [Accelerator Radiation Protection](https://cyclotroninfo.com/library/classics/accelerator-radiation-protection/) AD-755510 / TR-73-7 1972 · US Army Natick Laboratories Written to support drafting an Army regulation, and scoped to accelerators below 40–50 MeV — the only document here whose energy range starts where a small machine sits. X-ray and neutron shielding, induced radioactivity, exposure limits, pulsed-beam measurement, interlocks. Five figures borrowed from McGraw-Hill and ASME are replaced by notice pages. 196 pages · PDF, 19.3 MB · 56 design rules cite it ## In the queue The August 2026 repository hunt verified open public copies of these further construction reports at the links below. Restoration and hosting here follows as rights are stamped — each needs the same documented public-domain determination as the hosted set, and two (the 1939 Simon dissertation and UCRL-8767) may not clear, both for the same reason: a thesis stays its author’s copyright. Until then, the source-repository copies are the reference. - Zucker, Fowler & Livingston, Status Report on the 63" Cyclotron Heavy Particle Accelerator, CF-51-5-182, ORNL, 1951 — Construction status of the ORNL 63-inch heavy-particle machine. [[OSTI]](https://www.osti.gov/biblio/4356962) - Fulbright, Bromley et al., Preliminary Report on the New 8 MeV Variable Energy Cyclotron of the University of Rochester, NYO-6541, 1954 — Short machine-design report from a first-rank builder group. [[OSTI]](https://www.osti.gov/biblio/4355243) - Howard (ed.), Notes on an Azimuthally Varying Field (AVF) Cyclotron, CF-56-3-112, ORNL, 1956 — Design notes at the birth of the AVF era at ORNL. [[OSTI]](https://www.osti.gov/biblio/4346279) - Livingston, Howard & Rudolph, Bibliography of Cyclotron Literature, ORNL-2023, 1956 — The period’s own index of construction reports — the map for the next recovery pass. [[OSTI]](https://www.osti.gov/biblio/4370574) - Parkinson & Tickle, The University of Michigan 83-inch Cyclotron, Final Report, COO-921-16, 1965 — Project final report on the 83-inch construction. [[OSTI]](https://www.osti.gov/biblio/4580988) - Simon, The Generation of Radio-Frequency Power for a Cyclotron, Ph.D. dissertation, University of Chicago, 1939 — Pre-war RF power engineering for the Chicago cyclotron. Rights determination pending — a 1939 dissertation needs a renewal search before hosting. [[archive.org]](https://archive.org/details/IA41533924_0068) - Brown, Beam-Profile Indicator for 184-Inch Cyclotron, UCRL-8767, 1959 — A plastic-scintillator and camera beam-profile monitor — cheap and reproducible. Rights determination pending: the catalogue record marks it a thesis, and a thesis stays its author’s copyright even when the artifact carries a laboratory report number. [[OSTI]](https://www.osti.gov/biblio/4240233) - Space Radiation Effects Laboratory, NASA, 1962 (NTRS 19650011873) — Facility design description for the NASA 600 MeV synchrocyclotron at project outset. [[NTRS]](https://ntrs.nasa.gov/citations/19650011873) - SREL User’s Handbook, NASA, 1969 (NTRS 20040075026) — Machine properties, beam parameters, and facilities of the 600 MeV synchrocyclotron. [[NTRS]](https://ntrs.nasa.gov/citations/20040075026) Twenty-nine entries hosting sixty-nine public-domain PDFs is the honest current size of this collection, not its intended limit. It grows only as rights clear: candidates with unverified renewal status stay in the queue, and at least one classic paper enters the US public domain in 2029. Rights determinations are dated on each document page. > **Page provenance.** Last reviewed: 30 October 2026 · Hosted copies verified against OSTI, UNT Digital Library, NTRS, NIST and archive.org records; rights reviews August and October 2026 · [Methodology](https://cyclotroninfo.com/about/methodology/) · [Report a correction](mailto:info@cyclotroninfo.com?subject=Correction%3A%20Construction%20Classics) · [Changelog](https://cyclotroninfo.com/changelog/)