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TY - UNPB AU - Zhou, F. AU - Adolphsen, C. AU - Benwell, A.L. AU - Brown, G.W. AU - Dowell, D. AU - Dunning, M.P. AU - Gilevich, S. AU - Grouev, K. AU - Huang, G. AU - Jacobson, B.T. AU - Liu, X. AU - Miahnahri, A. AU - Sannibale, F. AU - Schmerge, J.F. AU - Vecchione, T. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Commissioning results of LCLS-II MHz repetition rate electron source J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - A 4 GeV 1.3 GHz superconducting linac is being constructed at SLAC as part of the X-ray free electron laser project (LCLS-II). The first 3-meter of the electron source that includes a normal conducting 185.7MHz CW RF gun, 2-cell 1.3 GHz CW RF buncher, and a loadlock system for cathode changes was designed and built by LBNL based on their experience with similar one for advanced photo-injector experiment program. The electron beam is designed to operate at a high repetition rate, up to 1 MHz. Since summer of 2018 we started LCLS-II injector source commissioning immediately after the major installation completion. This paper presents major commissioning results including achievements of ultra-high vacuum, RF processing to CW nominal power, dark current characterization and mitigation, and high-brightness electron beam measurements. PB - JACoW Publishing CP - Geneva, Switzerland ER -