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TY - UNPB AU - Zhang, Z. AU - Duris, J.P. AU - Huang, Z. AU - MacArthur, J.P. AU - Marinelli, A. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Attosecond Pulses and Advanced Techniques Planned for LCLS-II J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - Attosecond X-ray free-electron laser (XFEL) pulses can be generated by the chirp-taper technique at the LCLS-II. The electron beam is modulated through the self-modulation process in a wiggler and the taper of the undulator is optimized to amplify the XFEL pulse along the beam. In this paper, we present start-to-end numerical simulations to demonstrate the generation of two kinds of attosecond XFEL pulses at the LCLS-II: (1) two attosecond XFEL pulses with variable time delay and energy separation, and (2) isolated attosecond pulses with TW peak power. The output of this method provides a powerful tool for users to study ultrafast science at the attosecond timescale. PB - JACoW Publishing CP - Geneva, Switzerland ER -