when did cern first turn on

CERN officially began in 1954, but if you mean when its Large Hadron Collider first turned on, the first beam circulated on 10 September 2008. CERN’s own history page says CERN began in 1954, and its timeline notes the LHC successfully steered protons around the ring for the first time on 10 September 2008.

Quick Scoop

• CERN as an organization: 1954.

• LHC first turned on: 10 September 2008.

• First scheduled proton collisions after startup: 2015 after a maintenance shutdown, not the first-ever turn-on.

Context

The phrase “first turn on” is a bit ambiguous because people often mean either CERN itself or the LHC. In everyday conversation, most people are referring to the LHC, since that is CERN’s famous accelerator. The first beam circulating in the LHC on 10 September 2008 is the key milestone most answers use.

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