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TY - CONF AU - Krasilnikov, M. AU - Brachmann, A. AU - Li, X. AU - Lueangaramwong, A. AU - Mueller, F. AU - Nuhn, H.-D. AU - Stephan, F. AU - Tischer, M. AU - Vagin, P. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Modeling the Magnetic Field of the LCLS-I Undulator for THz@PITZ J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - An accelerator-based THz source for pump-probe experiments at the European XFEL is under development at the Photo Injector Test Facility at DESY in Zeuthen (PITZ). For the proof-of-principle experiments an LCLS-I undulator is planned to be installed downstream of the PITZ accelerator. The fields of the undulator module 26 have been re-measured at DESY in Hamburg and the results are consistent with earlier SLAC measurements. A model for 3D field reconstruction based on the undulator magnetic measurements has been developed. It includes also a horizontal gradient of the vertical field. Tracking of the 17 MeV/c beam has revealed that the transverse gradient will lead to a significant off-axis trajectory in the horizontal plane. This offset has to be corrected with a steering coil, the design of which is also presented. The performance of the THz generation with the correction coil is discussed as well. PB - JACoW Publishing CP - Geneva, Switzerland SP - 3855 EP - 3858 KW - undulator KW - FEL KW - simulation KW - vacuum KW - experiment DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-THPAB049 UR - https://jacow.org/ipac2021/papers/thpab049.pdf ER -