圆极化变参数摇摆器中电子的稳定性研究  

Study of Stability of Electron in a Circular Polarization Variable Parameter Wiggler

作　　者：徐勇根[1] 王时建[1] 沈涛[1] 田彬杉 张世昌[1,2] 

机构地区：[1]西华大学理学院,四川成都610039 [2]西南交通大学光电子学研究所,四川成都610031

出　　处：《光学与光电技术》2015年第1期74-78,共5页Optics & Optoelectronic Technology

基　　金：四川省教育厅基金(12ZB136);西华大学重点科研基金(Z1123329);西华大学教改专项(201310623028)资助项目

摘　　要：采用圆极化变参数摇摆器能延缓自由电子激光器件进入饱和,提高束波互作用效率。通过计算电子运动的柯尔莫哥洛夫熵来研究变参数摇摆器自由电子运动的稳定性。研究结果表明:摇摆器无论采用正坡度还是负坡度,平衡态电子的柯尔莫哥洛夫熵值均小于零,稳定性均比无坡度时好,但电子的运动轨迹趋于发散;当有激光场存在时,正坡度破坏电子运动的稳定性,负坡度改善电子运动的稳定性。其结果为电子运动稳定性的进一步研究提供参考。The circular polarization variable parameter wiggler is used for postponement of saturation of free-electron laser, and enhancing the efficiency of the beam-wave interaction. The stability of electron motion in a free-electron laser with varia- ble parameter wiggler is studied by means of the Kolmogorov entropy（K-entropy）. The study results indicate that the values of K entropy of the equilibrium electron are less than zero for the positive taper and the negative taper are used in the wig- gler, their stabilities are better than that of the uwtapered. However, the trajectory of the electron motion ends to diver- gence in the tapered wiggler. The positive taper will weaken stability of electron motion when there is the laser field, but the negative taper will improve stability of electron motion. The results can provide references for studying further stability of e- lectron motion.

关 键 词：自由电子激光器 圆极化变参数摇摆器 柯尔莫哥洛夫熵 稳定性 激光场 

分 类 号：TN248.6[电子电信—物理电子学]