The scene
CERN is associated with huge tunnels and enormous detectors, yet a particle accelerator begins with a much smaller question: how do you give the first charged particles enough energy to enter the main machine? At CERN, the answer once involved a Cockcroft–Walton high-voltage pre-injector. HAEFELY supplied the high-voltage generator and associated equipment for the Linac2 injection chain.
The engineering challenge
A CERN technical description explicitly identifies the purchased HAEFELY equipment. It gives the generator an 850 kV maximum output and describes its 5 kHz power conversion and original beam-loading compensation circuit. That original compensation was later replaced for reliability and maintenance reasons. This is engineering history rather than a flawless marketing narrative: a crucial part was delivered, operated, assessed and improved.
Why it matters
Linac2 ultimately accelerated protons to 50 MeV; that figure is not the HAEFELY high-voltage source rating, and the company did not manufacture the entire linac. A 750 kV Cockcroft–Walton pre-injector served until a radio-frequency quadrupole replaced it in 1993. The distinction may sound technical, but it is what gives the story credibility: a Swiss-built high-voltage system made an early stage of a major physics facility possible, without being the whole facility.
What the historical record shows
Linac1 contextualizes the accelerator environment, not a claim that the entire machine was manufactured by HAEFELY.
A historical CERN PhotoLab view establishes the appearance and context of Linac1; it does not by itself establish that HAEFELY supplied the whole machine or its illustrated components.
Image citation · CERN PhotoLab, Linac1 facility, 1960, via Wikimedia Commons · CERN PhotoLab
CC BY 4.0; resized WebP derivative of original Wikimedia Commons photograph, no content retouching
Open original sourceSources, scope and limits.
CERN and JACoW original reports and Linac1 historical sources; the voltages belong to the injector, not the full linac.
- CERN 2013 Fifty years PS volume II Linac1 and Linac2 CC BY 3.0S-080 · corporate_publication · online_text
- CERN Linac1 official accelerator history 1958-1992S-081 · corporate_publication · online_text
- CERN review and status 1976 new 50MeV Linac Haefely cascade delivered April 1975S-082 · primary_filing · online_text
- CERN 1979 Montauk proceedings new 50 MeV Linac Haefely 850kV 4mAS-083 · primary_filing · online_text
- CERN 1979 report beam loading bouncer replacement 79-30S-085 · primary_filing · 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.