Beam dynamics design of an SP-FEL compact THz source

Beam dynamics design of an SP-FEL compact THz source 1 2 first-author 1 corresp Corresponding author. E-mail address: daizhimin@sinap.ac.cn Corresponding author. E-mail address: daizhimin@sinap.ac.cn daizhimin@sinap.ac.cn Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China Graduate School, Chinese Academy of Sciences, Beijing 100049, China Graduate School, Chinese Academy of Sciences, Beijing 100049, China In recent years, people are looking for a new compact THz source with high emission power, one potential choice is to build small accelerator with Smith-Purcell radiation. The main difficulty is how to obtain high quality electron beam. In this paper, the beam dynamics design of a compact THz source is presented. The electron beam is produced by an electron gun and compressed by permanent magnets. The electron gun is similar to the Shanghai EBIT, but permanent magnets are used, instead of the superconducting magnets in Shanghai EBIT. With this design, we can reduce the size and cost of the whole device. Poisson/Pandira was employed to simulate and optimize the magnetic field. Egun was used to simulate the beam trajectories from the electron gun to the collector. Within 2 centimeters around the center of longitudinal magnetic field, the calculation showed that the beam satisfies to our design aim. THz source Smith-Purcell radiation Permanent ring magnet NdFeB References Smith S J , Purcell E M . Phys Rev , 1953 , 92 : 1069 - 1069 Phys Rev Kim K J , Song S B , Nucl Instrum Meth Phys Res A , 2001 , 475 : 158 - 163 . Nucl Instrum Meth Phys Res A Andrews H L , Brau C A , Phys. Rev. ST Accel Beams , 2004 , 7 : 070701-1-7 . Phys. Rev. ST Accel Beams Urata J , Goldstein M , Kimmitt M F et al . Phys Rev Lett , 1998 , 80 : 516 - 519 . Phys Rev Lett Gabriel Herrmann , Appl Phys , 1958 , 29 : 127 - 129 . Appl Phys Brewer G R ., in: A. Septier (Ed.), Focusing of Charged Particles , Vol. 2 , Academic Press , New York , 1967 , 73 - 77 . Focusing of Charged Particles Zhu X K , Jiang D K , Guo P L et al , Shanghai Electron Beam Ion Trap: design and current status . Journal of Physics: Conference Series , 2004 , 2 : 65 - 74 . Shanghai Electron Beam Ion Trap: design and current status QIAN L . Study on the performance of EBIT’s electron beam , in Nuclear Technology and Application . 2004 , Shanghai Institute of Applied Physics : Shanghai . Study on the performance of EBIT’s electron beam 10.13538/j.1001-8042/nst.21.266-270 2009-12-20 2010-10-20 2021-01-19 2010 Nuclear Science and Techniques 05 21