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 - Gonnella, D. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Commissioning and First Operation of the LCLS-II Linac 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 project installed a new superconducting linac at SLAC to enable free electron laser science at repetition rates up to 1 MHz. The installed 35 1.3 GHz cryomodules will produce a beam with energy of at least 4 GeV. Installation and commissioning of the cryomodules and warm beamline sections is now complete and the results have been excellent. Here we report on these results, primarily the performance of the SRF cavities in the installed linac, demonstrating no loss in performance from the installation compared with cryomodule acceptance testing at Fermilab and Jefferson Lab and achieving the high Q₀ that was developed through nitrogen doping. We also report on the cool down of the integrated cryoplant-linac system which enabled the high Q₀ performance as well as the beam commissioning through the LCLS-II cryomodules for the first time as well as the outlook for the future LCLS-II-HE upgrade. PB - JACoW Publishing CP - Geneva, Switzerland ER -