23 November 2009

Two circulating beams bring first collisions in the LHC

View of the CERN Control Centre

Screens showing two beams in the LHC. More photos »

Geneva, 23 November 2009. Today the LHC circulated two beams simultaneously for the first time, allowing the operators to test the synchronization of the beams and giving the experiments their first chance to look for proton-proton collisions.

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