Large Hadron Collider has been wound down for more upgrades
"Upgrade time already? It would seem so: three years since its last refit, CERN's Large Hadron Collider (LHC) is taking a two-year break so boffins can embark on another."
https://www.theregister.co.uk/2018/12/04/darkness_falls_at_large_hadron_collider_upgrade_starts/