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TY - CONF AU - Burrill, A. AU - Davis, G.K. AU - Gonnella, D. AU - Grassellino, A. AU - Melnychuk, O.S. AU - Palczewski, A.D. AU - Ross, M.C. AU - Zhao, L. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Vertical Test Results for the LCLS-II 1.3 GHz First Article Cavities J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - The LCLS-II project requires 35 1.3 GHz cryomodules to be installed in the accelerator in order to deliver a 4 GeV electron beam to the undulators hall. These 35 cryomodules will consist of 8 1.3 GHz TESLA style SRF cavities, a design most recently used for the XFEL project in Hamburg, Germany. The cavity design has remained largely unchanged, but the cavity treatment has been modified to utilize the nitrogen doping process to allow for Quality factors in excess of 3x10¹⁰ at 16 MV/m, the designed operating gradient of the cavities in the CM. Two industrialized vendors are producing most of the SRF cavities for these cryomodules; and the performance of the first article cavities, 16 from each vendor, will be reported on in this paper. PB - JACoW CP - Geneva, Switzerland SP - 1152 EP - 1155 KW - cavity KW - cryomodule KW - SRF KW - linac KW - FEL DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-MOPVA127 UR - http://jacow.org/ipac2017/papers/mopva127.pdf ER -