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TY - UNPB AU - Marinelli, A. AU - Bucksbaum, P.H. AU - Champenois, E. AU - Cryan, J. AU - Driver, T.D.C. AU - Duris, J.P. AU - Huang, Z. AU - Kling, M. AU - Li, S. AU - Lutman, A.A. AU - MacArthur, J.P. AU - Rosenberger, P. AU - Zhang, Z. AU - Zholents, A. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Attosecond Pulses from Enhanced SASE at LCLS J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - In my talk I will report the generation and diagnostic of GW-scale soft X-ray attosecond pulses with a current-enhanced X-ray free-electron laser. Our method is based on the enhaced SASE scheme, where an electron bunch with high-current spike is generated by the interaction of the relativistic electrons with a high-power infrared pulse. The X-ray pulses generated by the compressed electron beam are diagnosed with angular photoelectron streaking, and have a mean pulse duration of 350 attoseconds. Our source has a peak brightness that is 6 orders of magnitude larger than any other source of isolated attosecond pulses in the soft X-ray spectral region. This unique combination of high intensity, high photon energy and pulse duration enables the investigation of valence electron dynamics with non-linear spectroscopy and single-shot imaging. I will also discuss the generation of two-color attosecond pulses and our future plans for attosecond science at LCLS-II. PB - JACoW Publishing CP - Geneva, Switzerland ER -