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TY - CONF AU - Solyak, N. AU - Gonin, I.V. AU - Harms, E.R. AU - Kazakov, S. AU - Khabiboulline, T.N. AU - Lunin, A. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Simulations and Experimental Studies of Third Harmonic 3.9 Ghz CW Couplers for LCLS-II Project J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - LCLS-II linac is based on SRF technology developed for the XFEL project. The XFEL 3rd harmonic system built by INFN is based on the original designs of cavity and power coupler developed and built by Fermilab for the FLASH facility at DESY. For LCLS-II application both designs of the 3.9 GHz cavity and the power coupler have been modified for an operation in the continuous wave regime up to 2 kW average RF power. In this paper we discuss coupler modifications and the result multiphysics analysis for various operating regimes. For the initial test of a proposed design, we decided to modify two spare warm sections of power couplers, built for the FLASH facility, by shortening both of two inner bellows and making a thicker copper plating. Modification of the existing coupler test stand and the test program are briefly discussed in this paper. PB - JACoW CP - Geneva, Switzerland SP - 2280 EP - 2282 KW - cavity KW - operation KW - simulation KW - cryomodule KW - linac DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPMR011 UR - http://jacow.org/ipac2016/papers/wepmr011.pdf ER -