Gain enhancement in two-stream free electron laser with a planar wiggler and an axial guide magnetic field  

作　　者：S.Saviz Z.Rezaei Farzin M.Aghamir 

机构地区：[1]Plasma Physics Research Center,Science and Research Branch,Islamic Azad University [2]Department of Physics,University of Tehran

出　　处：《Chinese Physics B》2012年第9期247-250,共4页中国物理B（英文版）

摘　　要：The theory for a two-stream free electron laser （FEL） consisting of a relativistic electron beam transported alongthe axis of a planar wiggler in the presence of an axial guiding magnetic field is proposed and investigated. The electron trajectories and the small signal gain are derived. The characteristic of the linear gain and the normalized maximum gain are studied numerically. The result shows that the normalized maximum gain is considerably enhanced in comparison with that of the single stream. The effect of the difference between the energies of the two beams in this configuration of FEL is also considered, and we find that the gain is affected by the energy differences between groups 1 and 2.The theory for a two-stream free electron laser （FEL） consisting of a relativistic electron beam transported alongthe axis of a planar wiggler in the presence of an axial guiding magnetic field is proposed and investigated. The electron trajectories and the small signal gain are derived. The characteristic of the linear gain and the normalized maximum gain are studied numerically. The result shows that the normalized maximum gain is considerably enhanced in comparison with that of the single stream. The effect of the difference between the energies of the two beams in this configuration of FEL is also considered, and we find that the gain is affected by the energy differences between groups 1 and 2.

关 键 词：wo-stream free-electron laser 

分 类 号：TN248.6[电子电信—物理电子学] TN241