LHC is making a splash as CMS prepares for Run 3 November 15, 2021 | Lesya Horyn and Kaori Maeshima Proton beams are back in the LHC as the CMS collaboration readies for Run 3. With the CMS magnet running at full strength, the team observed beam splashes and pilot collisions in the LHC for the first time since 2018.