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
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
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
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.
中图分类号: (Free-electron lasers)