光阴极微波电子枪驱动激光整形与传输系统  

Drive laser shaping and transport system for photocathode RF gun

作　　者：李成 汪文星 李伟伟 张浩然 姜世民 高攀云 何志刚 张善才[1] Li Cheng;Wang Wenxing;Li Weiwei;Zhang Haoran;Jiang Shimin;Gao Panyun;He Zhigang;Zhang Shancai(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)

机构地区：[1]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《强激光与粒子束》2021年第9期107-112,共6页High Power Laser and Particle Beams

基　　金：Hefei Advanced Light Facility R&D Project。

摘　　要：为满足合肥先进光源对高品质注入束流的要求,合肥先进光源预研项目研制了一套光阴极微波电子枪系统作为注入器电子源。为降低空间电荷效应引起的束流发射度增长,对驱动激光整形及传输系统进行了理论和实验研究。通过双折射晶体的脉冲时间整形以及采用光阑高斯截断的空间整形,得到了近似均匀分布的激光脉冲。像传递激光传输光路,实现了光阴极表面激光位置的高稳定性。实验结果显示,光阴极表面的激光位置抖动小于4μm,激光性能满足实验要求。To meet the requirements of Hefei Advanced Light Facility(HALF)for high quality injection beam,a photocathode RF gun is developed as the electron source of the injector in the R&D project.To obtaining an electron beam with high qualities,it is necessary to carry out experimental research on drive laser shaping and transport system.For suppressing the beam emittance growth caused by space charge force,the temporal pulse shape is modified by using birefringent crystals,while an aperture is used for spatial pulse shaping.An optical image transport system is designed to achieve high stability of the laser beam position on the photocathode.Detailed design of the optical system is presented in this paper.The experimental result shows that a quasi uniform distribution in the three-dimensional space of laser pulse is obtained,and the laser beam position jitter on the photocathode is less than 4μm.The performance of the laser pulse meets the experiment requirements.

关 键 词：光阴极微波电子枪 激光整形 双折射晶体 传输系统 发射度 

分 类 号：TL503.3[核科学技术—核技术及应用]