The Antiproton Decelerator started operation in the year 2000.
Notes on verification
Confirmed by CERN's official sources and multiple independent technical documents; minor discrepancy in some academic papers citing 1999 as commissioning start, but consensus supports 2000 for operational start. [tier=unverified indep_score=0.3 clusters=3 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- Antiproton Decelerator (wikipedia)
- https://home.cern/science/accelerators/antiproton-decelerator/ (corroboration)
- https://cds.cern.ch/record/561996?ln=en (corroboration)
- https://home.cern/news/news/accelerators/ls2-report-rejuvenation-antiproton-decelerator (corroboration)
- https://cerncourier.com/a/cern-soups-up-its-antiproton-source/ (corroboration)