Two-beam based two-stage EEHG-FEL for coherent hard X-ray generation  

基于双电子束两级级联EEHG产生全相干硬X射线自由电子激光(英文)

作　　者：赵振堂 冯超 陈建辉 王震 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences

出　　处：《Science Bulletin》2016年第9期720-727,共8页科学通报（英文版）

基　　金：supported by the National Development and Reform Commission([2013]2347);National Natural Science Foundation of China(11475250);the Shanghai Natural Science Foundation(13ZR1464700)

摘　　要：The ability to generate stable and coherent short wavelength radiation is a great promise of the externally seeded free-electron laser. However, the fre- quency up-conversion efficiency is limited to a small number in a single stage setup. In this paper, we propose a new scheme to produce coherent hard X-ray FEL with two- beam based two-stage echo-enabled harmonic generation configuration. Electron beams with quite different proper- ties are separately used in each stage and a monochromator is adopted to purify the radiation from first stage for seeding the second stage. Three-dimensional start-to-end simulations have been performed with realistic parameters to show the feasibility of the proposed scheme.外种子型高增益自由电子激光(FEL)可用于产生稳定、全相干的短波长辐射脉冲.然而单级外种子型FEL的谐波转换效率有限,难以用于产生全相干的硬X射线辐射.本文提出了一种新型的双电子束、两级级联回声高次谐波产生(EEHG)的运行机制.在这种新机制中,两台独立的加速器分别用于产生软X射线FEL和硬X射线FEL所需的电子束,且电子束的参数可以根据需要进行独立的调谐.第一级软X射线FEL的输出辐射经过单色器后将作为第二级硬X射线FEL的种子激光,这保证了最终辐射脉冲的相干性.我们采用从头至尾的模拟方法对这一新机制进行了详细的模拟研究,模拟结果表明双电子束、两级级联EEHG可用于产生稳定、全相干的硬X射线FEL.

关 键 词：Seeded FEL EEHG Fresh beam Coherent hard X-ray 

分 类 号：O434.1[机械工程—光学工程]