Comparison of self-fields effects in two-stream electromagnetically pumped FEL with ion-channel guiding and axial magnetic field

被引：4

作者：

Saviz, S. ^{[1
]}

Mehdian, H. ^{[2
,3
]}

Aghamir, Farzin M. ^{[4
]}

Ghorannevis, M. ^{[1
]}

Ashkarran, A. A. ^{[1
]}

机构：

[1] Islamic Azad Univ, Sci & Res Branch, Plasma Phys Res Ctr, Tehran, Iran

[2] Tarbiat Moallem Univ, Dept Phys, Tehran 15614, Iran

[3] Tarbiat Moallem Univ, Inst Plasma Res, Tehran 15614, Iran

[4] Univ Tehran, Dept Phys, Tehran 14399, Iran

来源：

JOURNAL OF PLASMA PHYSICS | 2011年 / 77卷

关键词：

FREE-ELECTRON LASER; BEAM;

D O I：

10.1017/S0022377811000195

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

A theory of two-stream free-electron laser in a combined electromagnetic wiggler and an ion-channel guiding is developed. In the analysis, the electron trajectories and the small signal gain are derived by considering the effects of self-fields. Numerical calculations show that there are seven group's trajectories rather than nine groups reported in Mehdian and Saviz (2010 Chin. Phys. B 19(1), 014214). The comparison of the normalized gains and their corresponding normalized frequencies by employing the axial magnetic field and ion-channel guiding, with and without self-fields, in FEL has been studied numerically. The results show that the normalized maximum gain in FEL with axial magnetic is larger than that for using ion-channel guiding except in small region, but the results for their corresponding normalized frequencies are opposite.

引用

页码：765 / 776

页数：12

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