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TY - UNPB AU - Burrill, A. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - The LCLS-II SRF Linac J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - The LCLS-II project, a 4 GeV electron accelerator used to produce both hard and soft x-rays, is driven by a c.w. electron accelerator operating at 1.3 GHz. The project requires the fabrication, assembly and testing of 35 ' 1.3 GHz cryomodules and 2 ' 3.9 GHz cryomodules in order to generate the 4 GeV electron beam. The 280 TESLA style cavities used in the 1.3 GHz cryomodules have been modified for c.w. operation and are also utilizing nitrogen doping in order to achieve average Q0 of > 2.7·10¹⁰ at 16 MV/m. The status of the cavity and cryomodule testing will be reported on in this talk along with the challenges of achieving and maintaining the high Q0 in the cryomodule. PB - JACoW CP - Geneva, Switzerland ER -