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TY - CONF AU - Marcus, G. AU - Ding, Y. AU - Feng, Y. AU - Fiadonu, V. AU - Halavanau, A. AU - Huang, Z. AU - Krzywiński, J. AU - MacArthur, J.P. AU - Margraf, R.A. AU - Raubenheimer, T.O. AU - Zhu, D. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Regenerative Amplification for a Hard X-Ray Free-Electron Laser J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - An X-ray regenerative amplifier FEL (XRAFEL) utilizes an X-ray crystal cavity to provide optical feedback to the entrance of a high-gain undulator. An XRAFEL system leverages gain-guiding in the undulator to reduce the cavity alignment tolerances and targets the production of longitudinally coherent and high peak power and brightness X-ray pulses that could significantly enhance the performance of a standard single-pass SASE amplifier. The successful implementation of an X-ray cavity in the XRAFEL scheme requires the demonstration of X-ray optical components that can either satisfy large output coupling constraints or passively output a large fraction of the amplified coherent radiation. Here, we present new schemes to either actively Q-switch a diamond Bragg crystal through lattice constant manipulation or passively output couple a large fraction of the stored cavity radiation through controlled FEL microbunch rotation. A beamline design study, cavity stability analysis, and optimization will be presented illustrating the performance of potential XRAFEL configurations at LCLS-II/-HE using high-fidelity simulations. PB - JACoW Publishing CP - Geneva, Switzerland SP - 118 EP - 121 KW - FEL KW - cavity KW - electron KW - radiation KW - undulator DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-TUP032 UR - http://jacow.org/fel2019/papers/tup032.pdf ER -