A single stage EEHG at SXFEL for narrow-bandwidth soft X-ray generation

在为狭窄带宽的软 X 光检查产生的 SXFEL 的单个阶段 EEHG

The echo-enabled harmonic generation （EEHG） scheme holds promising prospects for efficiently generat- ing intense coherent radiation at very high harmonics of the initial seed laser. In this paper, we study the feasibility of operating the Shanghai X-ray free-electron laser test facility with a single stage EEHG setup. With a combina- tion of existing numerical codes, start-to-end simulations considering various three-dimensional effects have been carried out to show the possible performance of the EEHG FEL. Simulation results demonstrate that a single stage EEHG can generate high power soft X-ray radiation pulses with narrow bandwidth directly from UV seed lasers. With the help of the harmonic lasing technique or upgraded linac, we also show the possibility of generating coherent soft X-ray radiation in the ＂water window＂ with a single stage EEHG.

使回响能的泛音产生(EEHG ) 计划为高效地在起始的种子激光的很高的泛音产生强烈协调放射保持有希望的前景。在这份报纸，我们学习与单个阶段 EEHG 安装操作上海 X 光检查免费电子的激光测试设备的可行性。与存在数字代码的联合，就各种各样的三维的效果而言的 start-to-end 模拟被执行了显示出 EEHG FEL 的可能的表演。模拟结果证明阶段 EEHG 能高产生的一个单身者从紫外种子激光直接与狭窄的带宽驱动软 X 光检查放射脉搏。在放射激光的泛音的帮助下技术或升级的线性加速器，我们也显示出与单个阶段 EEHG 在水窗户中产生协调软 X 光检查放射的可能性。