JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Porter, R.D. AU - Aderhold, S. AU - Alsberg, L.E. AU - Cravatta, A.T. AU - Drury, M.A. AU - Gaitan, G. AU - Gonnella, D. AU - Holzbauer, J.P. AU - McCaughan, M.D. AU - Nelson, J. AU - Neveu, N.R. AU - Posen, S. AU - Stilin, N.A. AU - Wilson, C.M. AU - Zacarias, L.M. ED - Saito, Kenji ED - Xu, Ting ED - Sakamoto, Naruhiko ED - Schaa, Volker R.W. ED - Thomas, Paul W. TI - Microphonics in the LCLS-II Superconducting Linac J2 - Proc. of SRF2023, Grand Rapids, MI, USA, 25-30 June 2023 CY - Grand Rapids, MI, USA T2 - International Conference on RF Superconductivity T3 - 21 LA - english AB - The LCLS-II project has installed a new superconducting linac at SLAC that consists of 35 1.3 GHz cryomodules and 2 3.9 GHz cryomodules. The linac will provide a 4 GeV electron beam for generating soft and hard X-ray pulses. Cavity detuning induced by microphonics was a significant design challenge for the LCLS-II cryomodules. Cryomodules were produced that were within the detuning specification (10 Hz for 1.3 GHz cryomodules) on test stands. Here we present first measurements of the microphonics in the installed LCLS-II superconducting linac. Overall, the microphonics in the linac are manageable with 94% of cavities coming within the detune specification. Only two cavities are gradient limited due to microphonics. We identify a leaking cool down valve as the source of microphonics limiting those two cavities. PB - JACoW Publishing CP - Geneva, Switzerland SP - 302 EP - 305 KW - cryomodule KW - cavity KW - linac KW - operation KW - vacuum DA - 2023/09 PY - 2023 SN - 2673-5504 SN - 978-3-95450-234-9 DO - doi:10.18429/JACoW-SRF2023-MOPMB081 UR - https://jacow.org/srf2023/papers/mopmb081.pdf ER -