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@inproceedings{krasilnikov:ipac2021-thpab049, author = {M. Krasilnikov and A. Brachmann and X. Li and A. Lueangaramwong and F. Mueller and H.-D. Nuhn and F. Stephan and M. Tischer and P. Vagin}, % author = {M. Krasilnikov and A. Brachmann and X. Li and A. Lueangaramwong and F. Mueller and H.-D. Nuhn and others}, % author = {M. Krasilnikov and others}, title = {{Modeling the Magnetic Field of the LCLS-I Undulator for THz@PITZ}}, booktitle = {Proc. IPAC'21}, pages = {3855--3858}, eid = {THPAB049}, language = {english}, keywords = {undulator, FEL, simulation, vacuum, experiment}, venue = {Campinas, SP, Brazil}, series = {International Particle Accelerator Conference}, number = {12}, publisher = {JACoW Publishing, Geneva, Switzerland}, month = {08}, year = {2021}, issn = {2673-5490}, isbn = {978-3-95450-214-1}, doi = {10.18429/JACoW-IPAC2021-THPAB049}, url = {https://jacow.org/ipac2021/papers/thpab049.pdf}, note = {https://doi.org/10.18429/JACoW-IPAC2021-THPAB049}, abstract = {{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.}}, }