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TY - CONF AU - Nakamura, N. AU - Harada, K. AU - Higashi, N. AU - Kato, R. AU - Nagahashi, S. AU - Nigorikawa, K.N. AU - Nogami, T. AU - Obina, T. AU - Sagehashi, H. AU - Sakai, H. AU - Shimada, M. AU - Takai, R. AU - Tanaka, O.A. AU - Tanimoto, Y. AU - Uchiyama, T. AU - Ueda, A. ED - Zimmermann, Frank ED - Tanaka, Hitoshi ED - Sudmuang, Porntip ED - Klysubun, Prapong ED - Sunwong, Prapaiwan ED - Chanwattana, Thakonwat ED - Petit-Jean-Genaz, Christine ED - Schaa, Volker R.W. TI - Reconstruction and Beam-Transport Study of the cERL Dump Line for High-Power IR-FEL Operation J2 - Proc. of IPAC2022, Bangkok, Thailand, 12-17 June 2022 CY - Bangkok, Thailand T2 - International Particle Accelerator Conference T3 - 13 LA - english AB - A significant FEL pulse energy was successfully generated at the cERL IR-FEL in Burst mode where a macro pulse of about 1 microsecond or less is repeated at the maximum frequency of 5 Hz. In the next step, high-power FEL operation in CW mode should be carried out with energy recovery by increasing electron bunches drastically. However, momentum spread of the electron beam increases due to the FEL-light emission and the space charge effects and may cause serious beam loss by exceeding the momentum acceptance of the cERL downstream of the FEL. Therefore, we reconstructed the dump line in Autumn 2020 in order to greatly increase the momentum acceptance with improvement of the beam-tuning flexibility. Then we performed the beam-transport study of the reconstructed dump line in March 2021 by injecting the beam directly from the injector without passing the recirculation loop. In this paper, we present the reconstructed dump line and the beam-transport study. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1117 EP - 1120 KW - FEL KW - cavity KW - operation KW - beam-transport KW - electron DA - 2022/07 PY - 2022 SN - 2673-5490 SN - 978-3-95450-227-1 DO - doi:10.18429/JACoW-IPAC2022-TUPOPT051 UR - https://jacow.org/ipac2022/papers/tupopt051.pdf ER -