上海软X射线自由电子激光外种子运行模式的模拟研究 |
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引用本文: | 范伟杰,冯超,赵明华.上海软X射线自由电子激光外种子运行模式的模拟研究[J].强激光与粒子束,2022,34(3):031016-1-031016-6. |
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作者姓名: | 范伟杰 冯超 赵明华 |
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作者单位: | 1.中国科学院 上海应用物理研究所,上海 201800 |
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基金项目: | 国家自然科学基金项目(12122514,11975300); |
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摘 要: | 上海软X射线自由电子激光用户装置(SXFEL)是我国首台可以运行在水窗波段的自由电子激光装置,未来可以为5个实验线站供光,其主要运行模式为自放大自发辐射模式以及外种子模式。本文就SXFEL的外种子模式进行了从头到尾的模拟研究,主要包括EEHG-HGHG混合级联与单级EEHG两种方案。模拟结果表明,虽然EEHG-HGHG混合级联模式较为复杂,但能够产生更高功率的高次谐波辐射。除此之外,我们还研究了各种三维效应对EEHG的影响。模拟和分析结果表明,通过上述两种方案,采用紫外波段的种子激光,用户可以得到全相干、窄带宽、短脉冲的水窗波段自由电子激光。
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关 键 词: | 自由电子激光 高次谐波放大 回声谐波放大 全相干 窄带宽 |
收稿时间: | 2021-07-08 |
Simulation studies of external seeding schemes for Shanghai soft X-ray free electron laser |
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Institution: | 1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China2.University of Chinese Academy of Sciences, Beijing 100049, China3.Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China |
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Abstract: | Shanghai Soft X-ray Free Electron Laser User Facility (SXFEL-UF) is the first X-ray FEL in China that can produce coherent radiation in the water-window regime. The main working modes of SXFEL are self-amplified spontaneous emission and external seeding schemes. This paper mainly focuses on the start to end simulations of the external seeding schemes including echo-enabled harmonic generation-high gain harmonic generation cascade (EEHG-HGHG cascade) and single stage echo-enabled harmonic generation (EEHG). 3D simulations indicates that these external seeding schemes can generate coherent X-ray radiation at soft X-ray regime directly from a conventional UV seed laser. |
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