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TY - CONF AU - Zhang, Z. AU - Fisher, A.S. AU - Hoffmann, M.C. AU - Huang, Z. AU - Jacobson, B.T. AU - Kirchmann, P.S. AU - Lee, W.S. AU - Lindenberg, A. AU - Nanni, E.A. AU - Sasaki, S. AU - Schoenlein, R.W. AU - Xu, J.Z. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - A High-Power, High-Repetition Rate THz Source for LCLS-II Pump-Probe Experiments J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - Experiments using a THz pump and an x-ray probe at an x-ray free-electron laser (XFEL) facility like LCLS-II require frequency-tunable (3 to 20 THz), narrow bandwidth ( ∼ 10\%), carrier-envelope-phase-stable THz pulses that produce high fields (>1MV/cm) at the repetition rate of the x rays and well synchronized with them. In this paper, we study a two-bunch scheme to generate THz radiation at LCLS-II: the first bunch produces THz radiation in a permanent-magnet or electromagnet wiggler immediately following the LCLS-II undulator that produces X-rays from the second bunch. The initial time delay between the two bunches is optimized to compensate for the path difference in transport. We describe the two-bunch beam dynamics, the THz wiggler and radiation, as well as the transport system bringing the THz pulses from the wiggler to the experimental hall. PB - JACoW Publishing CP - Geneva, Switzerland SP - 556 EP - 559 KW - wiggler KW - radiation KW - FEL KW - laser KW - injection DA - 2019/11 PY - 2019 SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WEP104 UR - http://jacow.org/fel2019/papers/wep104.pdf ER -