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[2]Q. Chen, B. Qin, P. Tan, et al. Design of RF chopper system for improving beam quality in FEL injector with thermionic gun. Nuclear Instruments and Methods in Physics Research A. 2014, 755: 78-84.?

[3]CHEN Qu-Shan,?PEI Yuan-Ji, HU Tong-Ning, et al. A novel method for rigorously analyzing beam loading effect based on the macro-particle model. Chinese Physics Letters. 2014, 31(1): 012902.?

[4]Q. Chen, T. Hu, B. Qin, et al.?Focusing magnetic field design for a FEL linac.?In Proceedings of IPAC2013. Shanghai, China. 2013: 1949-1951.?