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

作者：Feng, Chao; Huang, Dazhang; Deng, Haixiao; Chen, Jianhui; Xiang, Dao; Liu, Bo; Wang, Dong; Zhao, Zhentang^*

来源：Science Bulletin, 2016, 61(15): 1202-1212.

DOI：10.1007/s11434-016-1140-9

• X-ray free-electron lasers
• EEHG
• Coherent soft X-ray
• Harmonic lasing
• Water window

The echo-enabled harmonic generation (EEHG) scheme holds promising prospects for efficiently generating 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 combination 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.

• 出版日期2016-8
• 单位中国科学院; 中国科学院上海应用物理研究所; 上海交通大学