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TY - CONF AU - Franz, P.L. AU - Bohler, D.K. AU - Cesar, D.B. AU - Cheng, X. AU - Cryan, J.P. AU - Driver, T.D.C. AU - Duris, J.P. AU - Guo, Z.H. AU - Kamalov, A. AU - Li, S. AU - Marinelli, A. AU - Obaid, R. AU - Robles, R. AU - Sudar, N.S. AU - Wang, A.L. AU - Zhang, Z. ED - Zimmermann, Frank ED - Tanaka, Hitoshi ED - Sudmuang, Porntip ED - Klysubun, Prapong ED - Sunwong, Prapaiwan ED - Chanwattana, Thakonwat ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker R.W. TI - High-Power Attosecond Pulses via Cascaded Amplification J2 - Proc. of IPAC2022, Bangkok, Thailand, 12-17 June 2022 CY - Bangkok, Thailand T2 - International Particle Accelerator Conference T3 - 13 LA - english AB - The timescale for electron motion in molecular systems is on the order of hundreds of attoseconds, and thus the time-resolved study of electronic dynamics requires a source of sub-femtosecond x-ray pulses. Here we report the experimental generation of sub-femtosecond duration soft x-ray free electron laser (XFEL) pulses with hundreds of microjoules of energy using fresh-slice amplification in two cascaded stages at the Linac Coherent Light Source. In the first stage, an enhanced self-amplified spontaneous emission (ESASE) pulse is generated using laser-shaping of the electron beam at the photocathode*. The electron bunch is then delayed relative to the pulse by a magnetic chicane, allowing the radiation to slip onto a fresh slice of the bunch, which amplifies the ESASE pulse in the second cascade stage. Angular streaking** characterizes the experimental pulse durations as sub-femtosecond at ~465 eV in the experiment. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1101 EP - 1102 KW - electron KW - FEM KW - laser KW - experiment KW - ISOL DA - 2022/07 PY - 2022 SN - 2673-5490 SN - 978-3-95450-227-1 DO - doi:10.18429/JACoW-IPAC2022-TUPOPT044 UR - https://jacow.org/ipac2022/papers/tupopt044.pdf ER -