CERN’s first big particle accelerator starts up

The Proton Synchrotron (PS) accelerates protons for the first time on 24 November, at the energy of 24 GeV, briefly becoming the world’s highest–energy particle accelerator. With a circumference of 628 metres, it is CERN’s first big particle accelerator. The PS continues to provide beams for experiments to this day, in addition to being an injector for larger machines.

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