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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 - Marcus, G. AU - Maxwell, T.J. ED - Bishofberger, Kip:Carlsten, Bruce (LANL, Los Alamos, NM, USA)[ORCID:0000-0001-5619-907X] ED - Schaa, Volker RW TI - Start-to-End Simulations for an X-Ray FEL Oscillator at the LCLS-II and LCLS-II-HE J2 - Proc. of FEL2017, Santa Fe, NM, USA, August 20-25, 2017 C1 - Santa Fe, NM, USA T2 - International Free Electron Laser Conference T3 - 38 LA - english AB - The proposed high repetition-rate electron beam from the LCLS-II and LCLS-II High Energy (LCLS-II-HE) upgrade are promising sources as drivers for an X-ray FEL Oscillator (XFELO) operating at both the harmonic and fundamental frequencies. In this contribution we present start-to-end simulations for an XFELO operating at the fifth harmonic with 4 GeV LCLS-II beam and at the fundamental with 8 GeV LCLS-II-HE beam. The electron beam longitudinal phase space is optimized by shaping the photoinjector laser and adjusting various machine parameters. The XFELO simulations show that high-flux output radiation pulses with 10¹⁰ photons and 3 meV (FWHM) spectral bandwidth can be obtained with the 8 GeV configuration. PB - JACoW CP - Geneva, Switzerland SP - 247 EP - 250 KW - ion KW - FEL KW - electron KW - gun KW - photon DA - 2018/02 PY - 2018 SN - 978-3-95450-179-3 DO - 10.18429/JACoW-FEL2017-TUC05 UR - http://jacow.org/fel2017/papers/tuc05.pdf ER -