Self-field effects on small-signal gain in two-stage free-electron lasers

Pramana

A Hasanbeigi¹  S Jafari1¹  H Mehdian¹ 

[1] Department of Physics and Institute for Plasma Research, Tarbiat Moallem University, Tehran 15614, Iran$$

关键词: Relativistic electron beam;    self-field effects;    electromagnetic wiggler.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Self-field effects, induced by charge and current densities of the electron beam, on gain in two-stage free-electron laser with nonuniform guide magnetic field is presented. The gain equation for small-signal has been derived analytically. The results of numerical calculations show a gain decrement for group I orbits and a gain enhancement for group II orbits, due to the self-field effects. The wiggler-induced self-magnetic field has a diamagnetic effect for group I orbits, whereas for group II, it has a paramagnetic effect. It is also found that using a nonuniform guide field, rather than a uniform one, causes the gain to increase.

【 授权许可】

Unknown