Effects of self-fields on electron trajectory and gain in two-stream electromagnetically pumped free-electron laser with ion channel guiding

作     者：S.Saviz Farzin M.Aghamir H.Mehdian M.Ghorannevis 

作者机构：Plasma Physics Research CenterScience and Research BranchIslamic Azad UniversityTehranP.O.Box.14665-678Iran Department of PhysicsUniversity of TehranN.Kargar AveTehran 14399Iran Department of Physics and Institute for Plasma ResearchTarbiat Moallem University49Dr.Mofatteh avenueTehran 15614Iran 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2011年第20卷第7期

页      面：158-164页

核心收录：

学科分类：080901[工学-物理电子学] 070207[理学-光学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 0702[理学-物理学] 

主　　题：free electron laser two-stream 

摘      要：A theory for the two-stream free-electron laser with an electromagnetic wiggler （EMW） and an ion channel guiding is developed. In the analysis, the effects of self-fields have been taken into account. The electron trajectories and the small signal gain are derived. The stability of the trajectories, the characteristics of the linear gain and the normalized maximum gain are studied numerically. The dependence of the normalized frequency ω corresponding to the maximum gain on the ion-channel frequency is presented. The results show that there are seven groups of orbits in the presence of the self-fields, which are similar to those reported in the absence of the self-fields. It is also shown that the normalized gains of 2 groups decrease while the rest increase with the increasing normalized ion-channel frequency. Furthermore, it is found that the two-stream instability and the self-field lead to a decrease in the maximum gain except for group 4.