Changelog
A dated record of what changed on this site: content additions, data updates, and substantive corrections, newest first. How the content itself is produced is documented in the editorial methodology. This log begins with the site’s 4 October 2026 edition; records of earlier revisions are retained internally.
- — The news page groups several reports of one story: coverage of the same announcement within about three weeks now appears once, under the most recent headline, with the other outlets named and linked beneath it. The grouping is mechanical — shared names and phrases in the headlines — and the page's no-editorial-selection rule is unchanged. Prompted by an outside review that counted six headlines for one Calgary cyclotron announcement.
- — Methodology page correction: its description of the Design Guide's external rule audit still said a random sample of the back catalogue is audited monthly. That sample ran until every published rule had been through the audit once (complete in September 2026) and was then retired in favour of re-auditing edited cards whenever a batch of post-publication corrections accumulates; the page now says so.
- — The Design Guide gains five static pages, one per applicability level (/design-guide/level/1/ to /level/5/), each carrying only that level's rules with the same dg-NNNN anchors. Until now a first reading at level 1 opened the all-in-one page, which downloads every rule and filters in the browser; the level-1 page delivers the forty-odd rules it is about. The all-in-one guide is unchanged and remains the view for combining subsystems, levels, and search terms; "start at level 1" links on the homepage and the guide's front page now open the level page.
- — Corrections from an outside editorial review. The start-to-first-beam spread quoted on "Should You Build a Cyclotron?" had fallen behind the builds census (it still read "two to four years" for a record that now runs one to six); both it and the builds page's own summary line now compute from the census. The homepage no longer describes the collection as "verified" — it is source-checked, with each part's review status stated on the methodology page — and leads with the three reader routes ahead of the collection figures; its news card says plainly that the jobs section is a directory of job boards. Library topic chips are limited to subjects with three or more documents (one-off indexing phrases remain on their entries and in search), and the news feed's market-research exclusion now catches "CAGR" and "forecast period" headlines.
- — Four of the hosted "Notes on the Mullins Mark I Cyclotron" are revised to their builder's September 2026 editions, each opening with a dated revision note: the RF/dee/ion-source note gains the builder's direct RF-system measurements (terminal capacitance, loaded Q, and the component table behind them — with dee voltage still stated as unmeasured), and the simulation-models note withdraws its earlier stem and feedthrough capacitance-by-subtraction statements. The instrumentation and performance notes carry the same revision box; page counts on the collection page update with the files. The series remains CC BY 4.0 under its author's name.
- — The worldwide cyclotron directory is live: 1,564 machines in 92 countries on a filterable map and list — identity, location at stated precision, category, current status, technical class, verification date, and public-tour availability with each facility's own tour link. The directory is published as a dated quarterly edition (this one: 4 October 2026), and every census-derived figure on the site computes from it, so the whole site shares one as-of. The data is downloadable as JSON or CSV under CC BY-NC 4.0; the Design Guide and bibliography exports are CC BY 4.0. Every record is verified against public sources, which are retained and available to researchers on request.
Spotted an error, a dead link, or an out-of-date claim? Corrections are welcome at [email protected] — fixes are made in place and noted here.