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TY - CONF AU - Li, C.L. AU - Dai, X.L. AU - Deng, H.X. AU - Feng, L. AU - Liu, B. AU - Wang, J.G. AU - Wang, X.T. AU - Zhang, W.Y. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Photoinjector Drive Laser Temporal Shaping for Shanghai Soft X-Ray Free Electron Laser 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 - Shanghai soft X ray free electron laser (SXFEL) initial designed shape of the photocathode driver laser is flattop produced by α-BBO stacking. The advantage of this design is attractive in producing electron bunch with low initial emittance and high uniformity along the electron bunch. However, some unavoidable modulations are generated along the laser pulse which trigger the electron bunch modulation generated at the source, which is due to the fast response time (tens of femtosecond) of copper cathode. In order to eliminate the modulation of electron bunch, temporal Gaussian driver laser was designed and tested, measurement results show the electron bunch longitudinal modulation was removed. In this paper, we present two kinds of driver laser pulse temporal shaping methods based on α-BBO stacking and UV grating pair shaping. Moreover, corresponding electron bunch temporal profile are also presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1674 EP - 1677 KW - laser KW - electron KW - cathode KW - FEL KW - flattop DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-TUPAB121 UR - https://jacow.org/ipac2021/papers/tupab121.pdf ER -