西华大学学报（自然科学版）Issue(2)：31-34,4.DOI:10.3969/j.issn.1673-159X.2014.02.007
坡度摇摆器自由电子激光中电子运动的稳定性分析
Stability of the Electron Motion in a Free-electron Laser with Tapered Wiggler
摘要
Abstract
One of the methods in enhancing the efficiency and output of a free-electron laser is the use of a tapered wiggler for post-ponement of the beam-wave interaction saturation .In this paper, the electron motion stability in a free-electron laser with tapered wig-gler is studied by means of the Kolmogorov entropy ( K-entropy ) .It is shown that values of K-entropy of the equilibrium electron oscil-late around zero when the wiggler is un-tapered, whereas values of K-entropy end to the negative value when the wiggler is tapered and consequently the motion stability is improved .It is found that the laser fields exponentially growing by extracting the kinetic energy of the electron beam cause heavy fluctuation of the K-entropy , and instead of a positive taper , a negative taper should be employed so as to improve the stability of the electron motion .关键词
自由电子激光器/坡度摇摆器/柯尔莫哥洛夫熵/相对论电子/运动稳定性Key words
free-electron laser/tapered wiggler/Kolmogorov entropy/relativistic electron/motion stability分类
信息技术与安全科学引用本文复制引用
徐勇根,张世昌,田彬杉,唐军成,刘鑫,沈涛..坡度摇摆器自由电子激光中电子运动的稳定性分析[J].西华大学学报（自然科学版）,2014,(2):31-34,4.基金项目
四川省教育厅基金（12ZB136）；西华大学重点科研基金 （）
