Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (3): 134-138 doi: 10.13538/j.1001-8042/nst.23.134-138


Velocity bunching for the linac of Shanghai Deep UV FEL facility

ZHANG Meng1,* GU Duan1,2 GU Qiang1 LIN Guoqiang1 LAN Taihe1 WANG Xingtao1 DENG Haixiao1   

  1. 1Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China 2Graduate University of Chinese Academy of Sciences,Beijing,100049,China
ZHANG Meng, GU Duan, GU Qiang, LIN Guoqiang, LAN Taihe, WANG Xingtao, DENG Haixiao . Velocity bunching for the linac of Shanghai Deep UV FEL facility.Nuclear Science and Techniques, 2012, 23(3): 134-138     doi: 10.13538/j.1001-8042/nst.23.134-138


High brightness electron beam is one of the main goals of the research and development effort in RF photo-injectors.Compared with the normally used magnetic chicane,an alternative scheme,commonly known as 'velocity bunching',has been proposed as a tool to compress electron beam pulses in modern high brightness photo-injector sources.This paper presents numerical optimization systematically and the first attempt to demonstrate the velocity bunching scheme on SDUV-FEL linac experimentally.The relationship between the degree of bunching and the off-crest phase of the accelerating structure is explored experimentally.Velocity bunching operating mode illustrates flexible performances with an intrinsic machine jitter,which agrees well with the theoretical prediction.

Key words: Linear accelerator(linac), Velocity bunching, Bunch length, Compression