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TY - CONF AU - Aderhold, S. AU - Bice, D.J. AU - Burrill, A. AU - Ginsburg, C.M. AU - Grimm, C.J. AU - Khabiboulline, T.N. AU - Melnychuk, O.S. AU - Sergatskov, D.A. AU - Solyak, N. AU - Wu, G. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - 3.9 GHz SRF Production Cavities for LCLS-II J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - The main part of the SRF linac for the Linac Coherent Light Source II (LCLS-II) at SLAC will consist of 35 cryomodules with superconducting RF cavities operating at 1.3 GHz. In addition, two cryomodules with 3.9 GHz cavities will be installed and help to linearize the longitudinal phase space of the beam. During the design verification phase, four prototype 9-cell 3.9 GHz cavities had been built by industry and then processed, including chemical surface removal and heat treatment, and tested at Fermi National Accelerator Laboratory. Based on the resulting cavity treatment recipe, 24 cavities (for two cryomodules to be installed in the linac and one spare cryomodule) have been built by industry and tested at Fermilab prior to cryomodule string assembly. We present an overview of the cavity production and the results of the vertical acceptance tests for the LCLS-II 3.9 GHz cavities. PB - JACoW Publishing CP - Geneva, Switzerland SP - 173 EP - 176 KW - cavity KW - cryomodule KW - linac KW - radiation KW - vacuum DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP051 UR - http://jacow.org/srf2019/papers/mop051.pdf ER -