Growth rate enhancement of free-electron laser by two consecutive wigglers with axial magnetic field

Pramana

E Khademi Bidhendi¹  A Hasanbeigi1¹  A Farhadian¹ 

[1] Department of Physics and Institute for Plasma Research, Kharazmi University, 43 Dr Mofatteh Avenue, Tehran 15614, Iran$$

关键词: Free-electron laser;    consecutive wiggler;    axial guide field;    growth rate.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The operative mechanism for a free-electron laser (FEL) with two consecutive helical wigglers having opposite circular polarization in the presence of an axial magnetic field is proposed and analysed. With the help of fluid theory, a tenth-degree polynomial dispersion equation for electromagnetic and space-charge waves is derived. The results are used to illustrate and discuss the dependence of growth rate on different system parameters. Finally, it is shown that for the same system parameters the growth rate of the proposed structure is more than the growth rate of instability in a conventional FEL.

【 授权许可】

Unknown