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@unpublished{zhang:napac2019-tuyba6, author = {Z. Zhang and J.P. Duris and Z. Huang and J.P. MacArthur and A. Marinelli}, title = {{Attosecond Pulses and Advanced Techniques Planned for LCLS-II}}, booktitle = {Proc. NAPAC'19}, language = {english}, intype = {presented at the}, series = {North American Particle Accelerator Conference}, number = {4}, venue = {Lansing, MI, USA}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {oct}, year = {2019}, note = {presented at NAPAC2019 in Lansing, MI, USA, unpublished}, abstract = {Attosecond X-ray free-electron laser (XFEL) pulses can be generated by the chirp-taper technique at the LCLS-II.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.}, }