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TY - CONF AU - Nantista, C.D. AU - Hoobler, S.L. AU - Kim, C. AU - Krejcik, P. AU - Martinez-Galarce, D.S. AU - McKee, B.D. AU - Rowen, M. AU - Young, A. ED - Kim, Changbum ED - Schaa, Volker R. W. ED - Kim, Dong-Eon ED - Lee, Jaeyu TI - Performance of the SLAC-PAL-Vitzrotech X-band Cavity BPMs in the LCLS-II Undulator Beam Lines J2 - Proc. of IBIC2021, Pohang, Rep. of Korea, 24-28 May 2021 CY - Pohang, Rep. of Korea T2 - International Beam Instrumentation Conference T3 - 10 LA - english AB - The hard X-ray and soft X-Ray undulator beamlines of the LCLS-II X-ray FEL incorporate 65 X-band RF beam position monitors for accurate tracking of the electron beam trajectories and Beam-Based Alignment. For this crucial function, a design was jointly developed between PAL and SLAC, consisting of a monopole reference cavity and a dipole position cavity, with signals coupled out through coaxial vacuum feed-throughs. For the relatively large quantity needed, the production of completed units was contracted to the Korean company, Vitzrotech, who developed the manufacturing processes to successfully fabricate the needed quantity. Herein, an overview is given of the production experience, tuning, installation, and performance of these devices. PB - JACoW Publishing CP - Geneva, Switzerland SP - 136 EP - 139 KW - cavity KW - coupling KW - dipole KW - electron KW - vacuum DA - 2021/10 PY - 2021 SN - 2673-5350 SN - 978-3-95450-230-1 DO - doi:10.18429/JACoW-IBIC2021-MOPP34 UR - https://jacow.org/ibic2021/papers/mopp34.pdf ER -