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TY - CONF AU - Wu, D. AU - He, T.H. AU - Li, P. AU - Liu, J. AU - Luo, X. AU - Pan, Q. AU - Shan, L.J. AU - Shen, X. AU - Wang, J. AU - Xiao, D.X. AU - Yan, L.G. AU - Zhang, P. AU - Zhou, K. ED - Boland, Mark ED - Tanaka, Hitoshi ED - Button, David ED - Dowd, Rohan ED - Schaa, Volker RW ED - Tan, Eugene TI - Beam Longitudinal Distribution Reconstructed by GESPAR Method at CAEP THz FEL J2 - Proc. of IPAC2019, Melbourne, Australia, 19-24 May 2019 CY - Melbourne, Australia T2 - International Particle Accelerator Conference T3 - 10 LA - english AB - Coherent radiation can be used to measure the longitudinal distribution of the electron beam bunch of any length, as long as the coherent radiation spectrum can be measured. In many cases, the Kramers-Krönig relationship is used to reconstruct the temporal distribution of the beam from the coherent radiation spectrum. However, the extrapolation of the low frequency will introduce the uncertainty of the reconstruction. In this paper, GrEedy Sparse PhAse Retrieval (GESPAR) method was used to reconstruct the beam longitudinal distribution measured by coherent transition radiation on the THz FEL facility of China Academy of Engineering Physics. The results indicate that the GESPAR method works well for the complex and ultrashort distribution. It will be an effective tool to accurately measure the femtosecond bunch temporal structure. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2602 EP - 2604 KW - radiation KW - electron KW - FEL KW - laser KW - experiment DA - 2019/06 PY - 2019 SN - 978-3-95450-208-0 DO - DOI: 10.18429/JACoW-IPAC2019-WEPGW055 UR - http://jacow.org/ipac2019/papers/wepgw055.pdf ER -