CERN bids farewell to the LHC and enters Long Shutdown 3 The Large Hadron Collider is embarking on its most ambitious upgrade yet — 29 June, 2026 Today, the Large Hadron Collider (LHC), the world’s most powerful particle accelerator, comes to the end of an extraordinary chapter in its scientific journey. Following its final physics run, the accelerator has been switched off to begin CERN’s Long Shutdown 3 (LS3), a major programme of maintenance, consolidation, upgrades and installation work that...