拉曼型自由电子激光器中相对论电子运动稳定性的比较研究  

Comparative study of relativistic electron motion stability in a Raman free-electron laser

作　　者：徐勇根[1] 王时建[1] 吉驭嫔[1] 徐竟跃[1] 卢宏[1] 刘晓旭[1] 张世昌[1,2] 

机构地区：[1]西华大学物理与化学学院物理系,成都610039 [2]西南交通大学光电子学研究所,成都610031

出　　处：《物理学报》2013年第8期131-136,共6页Acta Physica Sinica

基　　金：四川省教育厅科研基金(批准号:12ZB136);西华大学重点科研基金(批准号:Z1123329)资助的课题~~

摘　　要：拉曼型自由电子激光器作为一种兆瓦级高功率毫米波、太赫兹波辐射源,其电子的运动稳定性对整体器件的性能至关重要.本文采用科尔莫戈罗夫熵方法,以典型的麻省理工学院公布的实验数据为例,比较研究拉曼型正向导引磁场和反向导引磁场两类自由电子激光器中相对论电子的运动稳定性.结果表明:摇摆器绝热压缩磁场对电子运动的稳定性无实质性影响,但对电子运动影响大;电子束自身场在拉曼型正向导引磁场自由电子激光器中使电子运动稳定性变差,而在拉曼型反向导引磁场自由电子激光器中则可改善电子运动稳定性.In the Raman free-electron laser as a high-power radiation source with megawatt in millimeter and terahertz wave ranges, the stability of relativistic electron motion is of importance for the performance of the device. By making use of the reported MIT experimental data and Kolmogorov entropy, comparative study is carried out on the stability of the relativistic electron motion in a Raman free-electron laser with positive/reversed guide magnetic field. Results show that the wiggler adiabatic field has trivial influence on the stability of electron motion but substantially affects the electron motion itself in both positive and reversed guide magnetic field cases; the self-field of the electron beam deteriorates the motion stability in the case of a positive guide magnetic field, but favors the motion stability in the case of a reversed guide magnetic field.

关 键 词：拉曼型自由电子激光器 相对论电子运动稳定性 科尔莫戈罗夫熵 电子束自身场 

分 类 号：TN248.6[电子电信—物理电子学]