LCLS-II-HE Cryomodule Production Status at Fermilab

Abstract The Linac Coherent Light Source (LCLS) is an X-ray science facility at SLAC National Accelerator Laboratory. LCLS-II project (an upgrade to LCLS) in its final stages, and the LCLS-II-HE (High Energy) another enabling higher energy operation. An electron beam accelerated using superconducting radio frequency (SRF) cavities built into cryomodules. It planned build twenty-five modules total for project. Fourteen of these are be assembled tested Fermilab. Procurements production have been awarded, parts arriving. design similar module used LCLS-II. major cryomodule change from nominal gradient required per cavity, increasing 16 21 MV/m. additional yields heat loads. first cryomodule, referred as verification (vCM), was with new SRF cavities. assembly complete, this currently being vCM perform well, exceeding quality factor specifications. article start later 2021. status well some changes will presented.