The scene
An old accelerator manual can contain the clearest kind of industrial history: a brand name in the part of the machine that made the physics possible. At Fermilab in Illinois, the preaccelerator system used a high-voltage multiplier manufactured by Emil Haefely & Cie. AG. A 1986 laboratory design document describes the conversion of a 5 kHz electrical input into approximately −750 kV DC for negative hydrogen ions.
The engineering challenge
Why so high a voltage before the main accelerator? The ion source started inside an electrically elevated structure. As the particles travelled toward ground potential, the voltage gave them their first acceleration. Only after this initial step could the rest of the machine take over. Fermilab’s own records describe equipment testing in 1970, later use of twin high-voltage systems, and eventual replacement by a radio-frequency quadrupole in 2012.
Why it matters
This is a complementary American chapter to CERN. The purpose was not a lightning test, and HAEFELY did not design Fermilab’s entire complex. What survives is more precise: a company from Basel appears by name in a technical history of how a particle beam began its journey. Original period manuals and laboratory records are the appropriate evidence, not a retroactively invented headline about constructing a national laboratory.
Sources, scope and limits.
Original 1986 Fermilab technical manual and period records identify a HAEFELY high-voltage multiplier.
- Fermilab historical Village Crier March 26 1970 testing Haefely preacceleratorS-086 · historic_media · online_text
- Fermilab Dan Patterson The FNAL Linac March 1986 operating manualS-087 · primary_filing · online_text
- Fermilab 2011 accelerator complex overview two 750kV Haefely systemsS-088 · primary_filing · online_text
- Fermilab official accelerator history Cockcroft Walton replacements Oct 2012S-089 · corporate_publication · online_text
Visual quotations document individual historical points with named sources and creators; they are not a general image-library licence. Equipment claims are intentionally narrower than the surrounding institution’s activities.