Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser

doi:10.1088/1674-1056/23/2/024103

中国物理B ›› 2014, Vol. 23 ›› Issue (2): 24103-024103.doi: 10.1088/1674-1056/23/2/024103

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser

吉驭嫔^a, 王时建^a, 徐竟跃^a, 徐勇根^a, 刘晓旭^a, 卢宏^a, 黄小莉^b, 张世昌^a

a School of Physics and Chemistry, Xihua University, Chengdu 610039, China;
b School of Electrical and Information Engineering, Xihua University, Chengdu 610039, China

收稿日期:2013-04-13 修回日期:2013-05-08 出版日期:2013-12-12 发布日期:2013-12-12
基金资助:
Project supported by the Science Foundation of Department of Education of Sichuan Province, China (Grant No. 12233454), the Youth Foundation of Department of Education of Sichuan Province, China (Grant No. 10ZB080), and the Xihua University Foundation, China (Grant No. Z0913306).

Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser

Ji Yu-Pin (吉驭嫔)^a, Wang Shi-Jian (王时建)^a, Xu Jing-Yue (徐竟跃)^a, Xu Yong-Gen (徐勇根)^a, Liu Xiao-Xu (刘晓旭)^a, Lu Hong (卢宏)^a, Huang Xiao-Li (黄小莉)^b, Zhang Shi-Chang (张世昌)^a

a School of Physics and Chemistry, Xihua University, Chengdu 610039, China;
b School of Electrical and Information Engineering, Xihua University, Chengdu 610039, China

Received:2013-04-13 Revised:2013-05-08 Online:2013-12-12 Published:2013-12-12
Contact: Zhang Shi-Chang E-mail:sczhang@home.swjtu.edu.cn
About author:41.60.Cr; 52.59.Rz; 94.05.Pt
Supported by:
Project supported by the Science Foundation of Department of Education of Sichuan Province, China (Grant No. 12233454), the Youth Foundation of Department of Education of Sichuan Province, China (Grant No. 10ZB080), and the Xihua University Foundation, China (Grant No. Z0913306).

摘要/Abstract

摘要： Irregular phase-space orbits of the electrons are harmful to the electron-beam transport quality and hence deteriorate the performance of a free-electron laser (FEL). In previous literature, it was demonstrated that the irregularity of the electron phase-space orbits could be caused in several ways, such as varying the wiggler amplitude and inducing sidebands. Based on a Hamiltonian model with a set of self-consistent differential equations, it is shown in this paper that the electron-beam normalized plasma frequency functions not only couple the electron motion with the FEL wave, which results in the evolution of the FEL wave field and a possible power saturation at a large beam current, but also cause the irregularity of the electron phase-space orbits when the normalized plasma frequency has a sufficiently large value, even if the initial energy of the electron is equal to the synchronous energy or the FEL wave does not reach power saturation.

关键词: free-electron laser, electron phase-space orbit, normalized plasma frequency, irregularity

Abstract: Irregular phase-space orbits of the electrons are harmful to the electron-beam transport quality and hence deteriorate the performance of a free-electron laser (FEL). In previous literature, it was demonstrated that the irregularity of the electron phase-space orbits could be caused in several ways, such as varying the wiggler amplitude and inducing sidebands. Based on a Hamiltonian model with a set of self-consistent differential equations, it is shown in this paper that the electron-beam normalized plasma frequency functions not only couple the electron motion with the FEL wave, which results in the evolution of the FEL wave field and a possible power saturation at a large beam current, but also cause the irregularity of the electron phase-space orbits when the normalized plasma frequency has a sufficiently large value, even if the initial energy of the electron is equal to the synchronous energy or the FEL wave does not reach power saturation.

Key words: free-electron laser, electron phase-space orbit, normalized plasma frequency, irregularity

中图分类号: (Free-electron lasers)

41.60.Cr

52.59.Rz (Free-electron devices) 94.05.Pt (Wave/wave, wave/particle interactions)

吉驭嫔, 王时建, 徐竟跃, 徐勇根, 刘晓旭, 卢宏, 黄小莉, 张世昌. Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser[J]. 中国物理B, 2014, 23(2): 24103-024103.

Ji Yu-Pin (吉驭嫔), Wang Shi-Jian (王时建), Xu Jing-Yue (徐竟跃), Xu Yong-Gen (徐勇根), Liu Xiao-Xu (刘晓旭), Lu Hong (卢宏), Huang Xiao-Li (黄小莉), Zhang Shi-Chang (张世昌). Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser[J]. Chin. Phys. B, 2014, 23(2): 24103-024103.

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Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser

Effect of normalized plasma frequency on electron phase-space orbits in a free-electron laser

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