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 ›› 2010, Vol. 21 ›› Issue (5): 266-270 doi: 10.13538/j.1001-8042/nst.21.266-270


Beam dynamics design of an SP-FEL compact THz source

DAI Dongdong1, 2 DAI Zhimin1,*   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China 2 Graduate School, Chinese Academy of Sciences, Beijing 100049, China
DAI Dongdong, DAI Zhimin. Beam dynamics design of an SP-FEL compact THz source.Nuclear Science and Techniques, 2010, 21(5): 266-270     doi: 10.13538/j.1001-8042/nst.21.266-270


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.

Key words: THz source, Smith-Purcell radiation, Permanent ring magnet, NdFeB