JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB AU - Checchin, M. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Status of Cavity and Cryomodule Production for LCLS-II-HE J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - The LCLS-II HE project is the energy upgrade to the superconducting LCLS-II linac. It consists in adding twenty-three additional 1.3 GHz cryomodules to the linac, with cavities operating at a gradient of 20.8 MV/m with internal quality factor of 2.7·10¹0. Cavity production and cryomodule assembly are currently in full regime. Cavities are being manufactured in industry with a modified doping recipe and surface processing compared to LCLS-II production. This allows to achieve ¿ and exceed ¿ the more demanding specifications of LCLS-II-HE. The cryomodules are assembled and tested at the two partners labs (Fermilab and Jefferson Lab) similarly to LCLS-II and then delivered at SLAC. Test data demonstrate the high performance of the cryomodules currently being assembled: the usable voltage gain per cryomodule is in average 206.8 MV, exceeding specification by 34 MV, and the average Q-factor at 20.8 MV/m is 3·10¹0. Based on the current data, we expect to continue delivering high performance cryomodules and move successfully to the installation phase of the project. PB - JACoW Publishing CP - Geneva, Switzerland ER -