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TY - CONF AU - Qin, W. AU - Bane, K.L.F. AU - Ding, Y. AU - Huang, S. AU - Huang, Z. AU - Kim, K.-J. AU - Lindberg, R.R. AU - Liu, K.X. AU - Maxwell, T.J. ED - Petit-Jean-Genaz, Christine ED - Kim, Dong Eon ED - Kim, Kyung Sook ED - Ko, In Soo ED - Schaa, Volker RW TI - Beam Optimization Study for an X-ray FEL Oscillator at the LCLS-II J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016 C1 - Busan, Korea T2 - International Particle Accelerator Conference T3 - 7 LA - english AB - The 4 GeV LCLS-II superconducting linac with high repetition beam rate enables the possibility to drive an X-Ray FEL oscillator at harmonic frequencies *. Compared to the regular LCLS-II machine setup, the oscillator mode requires a much longer bunch length with a relatively lower current. Also a flat longitudinal phase space distribution is critical to maintain the FEL gain since the X-ray cavity has extremely narrow bandwidth. In this paper, we study the longitudinal phase space optimization including shaping the initial beam from the injector and optimizing the bunch compressor and dechirper parameters. We obtain a bunch with a flat energy chirp over 400 fs in the core part with current above 100 A. The optimization was based on LiTrack and Elegant simulations using LCLS-II beam parameters. PB - JACoW CP - Geneva, Switzerland SP - 3020 EP - 3023 KW - flattop KW - electron KW - emittance KW - FEL KW - linac DA - 2016/06 PY - 2016 SN - 978-3-95450-147-2 DO - 10.18429/JACoW-IPAC2016-WEPOY019 UR - http://jacow.org/ipac2016/papers/wepoy019.pdf ER -