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TY - CONF AU - Hellert, T. AU - Ackermann, W. AU - Adolphsen, C. AU - De Gersem, H. AU - Li, Z. AU - Mayes, C.E. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Microphonic Detuning Induced Coupler Kick Variation at LCLS-II J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The LCLS-II free-electron laser will be an upgrade of the existing Linac Coherent Light Source (LCLS), including a 4 GeV CW superconducting linac based on the TESLA technology. The high quality factor of the cavity makes it very sensitive to vibrations. The shift of its eigenfrequency (i.e., detuning) will be compensated by the power source in order to assure a constant accelerating voltage. Significant variations of the forward power are expected which result in coupler kick variations induced by the fundamental power coupler. In this work we estimate the magnitude of trajectory jitter caused by these variations. High precision 3D field maps including standing and traveling-wave components for a cavity with the LCLS-II coupler design are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1456 EP - 1459 KW - cavity KW - linac KW - laser KW - free-electron-laser KW - beam-loading DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPMF081 UR - http://jacow.org/ipac2018/papers/tupmf081.pdf ER -