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TY - CONF AU - Yang, C. AU - Deng, H.X. AU - Feng, Y. AU - He, D.H. AU - Hong, Y. AU - Krzywinski, J. AU - Raubenheimer, T.O. AU - Tsai, C.-Y. AU - Wang, X.F. AU - Wu, J. AU - Yang, B. AU - Yoon, M. AU - Zhou, G. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Simulation for LCLS-II Hard X-ray Self Seeding Scheme 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 - Typical SASE FELs have poor temporal coherence because of starting from shot noise. Self-seeding scheme is an approach to improve the longitudinal coherence. The single crystal monochromator self-seeding has been in successful operation in LCLS. For the high repetition rate LCLS-II machine, for damage consideration, it was initially proposed to have a two-stage self-seeding scheme, yet we have found the two-stage self-seeding scheme has no advantage over one-stage self-seeding scheme. In this paper, we investigate the optimal self-seeding configuration of LCLS-II for different photon energies, and present a comparison between one-stage and two-stage self-seeding scheme of LCLS-II. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4406 EP - 4409 KW - undulator KW - FEL KW - photon KW - simulation KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-THPMK053 UR - http://jacow.org/ipac2018/papers/thpmk053.pdf ER -