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TY - UNPB AU - Marinelli, A. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Towards Attosecond Science at LCLS and LCLS-II 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 - Time-resolved experiments at the attosecond scale hold great promise for understanding ultrafast electron dynamics in molecules, as well as the role of electron coherence in chemistry. In the recent past, much progress has been made in using X-ray free-electron lasers (X-FELs) to visualize atomic motion at the tens of femtosecond scale. At the same time, table-top lasers have been operated at the attosecond scale and successfully employed in scientific experiments. However, the femtosecond barrier has not yet been broken at X-ray free-electron lasers, hindering our ability to understand the fundamental motion of electrons. This invited talk describes the XLEAP project, aimed at generating attosecond pulses in the soft-X-ray region at LCLS, including the physics of laser-enhanced FELs and the effect of bandwidth broadening in this FEL mode. This talk will also present early XLEAP commissioning results and the immediate experimental plans, and describe plans for the transition from FEL R&D to science and discuss the roadmap to attosecond science with LCLS-II. PB - JACoW Publishing CP - Geneva, Switzerland ER -