Linear Accelerator 4 is designed to carry negative hydrogen ions to high energies. It became the proton beam source for the LHC in 2020. Linac4 carries negative hydrogen ions (H-ions, a hydrogen atom and an additional electron) at the energy of 160 MeV before transmitting them to the Synchrotron Proton Booster, which is part of the LHC injection chain.

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