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Comparative study of electron motion and stability for different focusing regimes in a free-electron laser with three-dimensional helical wiggler

Published online by Cambridge University Press:  13 July 2015

Jing-Yue Xu ,
S.-J. Wang ,
Y.-G. Xu ,
Y.-P. Ji ,
X.-X. Liu  and
Shi-Chang Zhang
Jing-Yue Xu
Affiliation:
School of Physics and Chemistry, Xihua University, Chengdu, Sichuan 610039, China
S.-J. Wang
Affiliation:
School of Physics and Chemistry, Xihua University, Chengdu, Sichuan 610039, China
Y.-G. Xu
Affiliation:
School of Physics and Chemistry, Xihua University, Chengdu, Sichuan 610039, China
Y.-P. Ji
Affiliation:
School of Physics and Chemistry, Xihua University, Chengdu, Sichuan 610039, China
X.-X. Liu
Affiliation:
School of Physics and Chemistry, Xihua University, Chengdu, Sichuan 610039, China
Shi-Chang Zhang*
Affiliation:
School of Physics and Chemistry, Xihua University, Chengdu, Sichuan 610039, China Institute of Photoelectronics, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
*
†Email address for correspondence: sczhang@home.swjtu.edu.cn
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Abstract

Since the electromagnetic energy gained by the laser wave in a free-electron laser (FEL) is transferred from the kinetic energy loss of a relativistic electron beam, the stability of electron motion is one of the key factors that affect FEL performance. In this paper the stability of electron motion is compared for different focusing regimes. It is demonstrated that the natural focusing regime of a three-dimensional wiggler is easily broken by the self-field of the electron beam. The magnetic focusing regime of an axial guide magnetic field is based on the superposition of a strong Larmor rotation on the transverse quiver motion of the electrons, while the electric focusing regime of an ion-channel guiding field generates an electric force to counteract the divergent effect of the beam self-field. In comparison with the magnetic focusing regime of an external magnetic system, the electric focusing regime of an ion-channel guiding field may yield smaller instantaneous Larmor radius and slighter Larmor-centre deviation from the axis and provide better motion stability.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 5 , October 2015 , 905810506
Copyright
© Cambridge University Press 2015 

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