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@unpublished{li:ibic2020-wepp25,
author = {C.L. Li and L. Feng and B. Liu and X.T. Wang and W.Y. Zhang},
title = {{Photoinjector Driver Laser Temporal Shaping and Diagnostics for Shanghai Soft X-ray Free Electron Laser}},
booktitle = {Proc. IBIC'20},
language = {english},
intype = {presented at the},
series = {International Beam Instrumentation Conference},
number = {9},
venue = {Santos, Brazil},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {oct},
year = {2020},
note = {presented at IBIC2020 in Santos, Brazil, unpublished},
abstract = {It is known that the intensity distribution plays an important role in the electron bunch character, such as its transverse emittance, longitudinal structure. Compared with longitudinal Gaussian distribution, Driver laser pulse with longitudinal flattop structure can produce electron bunch with lower emittance. This paper presents electron beam structure and emittance under different driver laser structure, specifically, laser pulse temporal shaping method for producing Gaussian beam and flattop beam are presented. The advantage and disadvantage of the two method are also discussed. Flattop beam produced from BBO stacking is more benefit for producing electron beam with lower emittance, but significantly increase the microbunch effect. However, Gaussian beam has the advantage to help reducing the mircobunch effect. Moreover, cross correlation method for characterization the laser pulse temporal structure are also presented, particularly, the group velocity mismatch effect induced by the sum frequency BBO crystal are discussed.},
}