回声谐波放大型自由电子激光相干涡旋X射线产生方案

孙昊; 冯超; 刘波

doi:10.11884/HPLPB202234.210285

回声谐波放大型自由电子激光相干涡旋X射线产生方案

doi: 10.11884/HPLPB202234.210285

孙昊^{1, 2,},
冯超^{1, 3, ,},
刘波^{1, 3}

1.
中国科学院上海应用物理研究所，上海 201800
2.
中国科学院大学，北京 100049
3.
中国科学院上海高等研究院，上海 201210

基金项目: 国家自然科学基金项目（12122514，11975300）

详细信息

作者简介:
孙　昊，sunahao@sinap.ac.cn

通讯作者:
冯　超，fengchao@zjlab.org.cn

中图分类号: TL99
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- 文章访问数: 1697
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- PDF下载量: 130
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-14
- 修回日期: 2021-12-08
- 网络出版日期: 2021-12-17
- 刊出日期: 2022-01-13

Coherent X-ray vortex generation based on echo-enabled harmonic generation free electron laser

Sun Hao^{1, 2
,},
Feng Chao^{1, 3
, ,},
Liu Bo^{1, 3}

1.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

摘要

摘要: 外种子型自由电子激光具有全相干、频谱稳定、极高亮度的优点，可以实现在超小空间和超快时间尺度下对物质结构的研究。具有特殊横向相位模式的光特别是具有螺旋相位的带轨道角动量的涡旋光已经在众多科学领域有了应用，基于自由电子激光原理产生的辐射横向模式基本上为简单的高斯模式，为产生具有横向螺旋相位的相干涡旋X射线，对基于回声谐波放大型(EEHG)自由电子激光产生涡旋光方案进行了深入研究，并且根据上海软X射线自由电子激光装置(SXFEL)的参数，进行了相关方案设计和模拟研究。三维模拟结果表明，外种子型EEHG自由电子激光可以产生峰值功率可达到GW量级的相干涡旋软X射线。
- 涡旋光 /
- 外种子型自由电子激光 /
- 软X射线 /
- 轨道角动量
Abstract: External seeded free electron lasers (FELs) hold great advantage of emitting extremely high intensity, fully coherent, specially stable light, allowing researchers to study the structure of matter in ultra-small space and ultra-fast time scales. The light with a special transverse phase mode, especially vortex light with orbital angular momentum has been used in many scientific fields. However, the transverse mode of the FELs radiation is basically a simple gaussian mode. In this paper, the generation of the vortex light based on echo-enabled harmonic generation (EEHG) free electron laser is theoretically studied and the simulation studies are carried out according to the parameters of Shanghai Soft X-ray Free Electron Laser Facility (SXFEL). The results of three- dimensional simulation show that the EEHG type free electron laser can produce coherent vortex soft X rays with peak power up to GW magnitude.
- optical vortex /
- external seeded free electron laser /
- soft X ray /
- helical phase

HTML全文

图 1 EEHG示意图

Figure 1. Scheme of EEHG

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图 2 基于EEHG的涡旋光产生方案示意图

Figure 2. The vortex generation scheme based on EEHG

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图 3 电子束相空间结构变化

Figure 3. The evolution of the electron beam phase space

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图 4 第二色散段出口处电子束团的螺旋群聚因子分布

Figure 4. Helical bunching distribution along the electron beam at the exit of the second dispersion section

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图 5 波荡器中FEL辐射变化

Figure 5. The evolution of the FEL radiation in radiator

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图 6 沿辐射段波荡器的群聚因子变化曲线

Figure 6. The evolution of the bunching factor along the radiator

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图 7 微聚束横向分布相位

Figure 7. The transverse phase distribution of the microbunching

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表 1 模拟参数

Table 1. Parameters for simulation

energy/GeV	peak current/A	energy spread/keV	laser wavelength/nm	laser power_1/MW	laser power_2/MW
1.6	1500	160	266	200	200

modulator length_1/m	modulator length_2/m	R56_1/m	R56_2/m	FEL wavelength/nm	radiator period/m
1	1	0.0034	0.000093	7	0.055

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