激光与光电子学进展, 2016, 53 (6): 061404, 网络出版: 2016-05-25  

基于带状束的史密斯-帕塞尔自由电子激光模拟与分析 下载: 694次

Simulation and Analysis of Smith-Purcell Free Electron Laser Based on Sheet-Beam
作者单位
聊城大学物理科学与信息工程学院山东省光通信科学与技术重点实验室,山东 聊城 252059
摘要
采用三维数值模拟方法研究了基于带状束的史密斯-帕塞尔自由电子激光(S-P FEL)的辐射输出特性。当一束相对论带状束紧贴着矩形光栅表面飞行时,可以激励起非相干的史密斯-帕塞尔(S-P)辐射,而全反馈谐振腔可以将各个方位角的S-P辐射反射回带状束,同时进行速度调制,使电子注发生群聚,进而获得相干的S-P辐射。通过数值模拟发现,带状束可以提高S-P FEL的功率和功率谱密度;随着带状束宽高比的增大,电子束的速度调制和群聚更为明显,S-P FEL的功率和功率谱密度也越大。
Abstract
The radiation output characteristics of the Smith-Purcell free electron laser (S-P FEL) based on different sheet-beams are studied by the three-dimensional numerical simulation. As a sheet-beam flies closely to the rectangular gratings, it emits incoherent Smith-Purcell (S-P) radiation. The full feedback resonator reflects the radiation with a random azimuth angle back onto the sheet-beam and causes the electrons to be modulated, which leads to electron bunching and coherent S-P radiation. The numerical simulation results show that the power and power spectrum density of S-P FEL can be increased by the sheet-beams. The modulation of sheet-beam, the bunching state of sheet-beam, and the power and power spectrum density of S-P FEL, all increase with the increasing aspect ratio of sheet-beam.

孟现柱, 王明红, 任忠民. 基于带状束的史密斯-帕塞尔自由电子激光模拟与分析[J]. 激光与光电子学进展, 2016, 53(6): 061404. Meng Xianzhu, Wang Minghong, Ren Zhongmin. Simulation and Analysis of Smith-Purcell Free Electron Laser Based on Sheet-Beam[J]. Laser & Optoelectronics Progress, 2016, 53(6): 061404.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!