产生超快水窗波段X射线的ESASE方案模拟

涂凌君; 冯超; 王晓凡; 赵振堂

doi:10.11884/HPLPB202234.210282

产生超快水窗波段X射线的ESASE方案模拟

doi: 10.11884/HPLPB202234.210282

涂凌君^{1, 2,},
冯超^{1, 3, ,},
王晓凡⁴,
赵振堂^{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
4.
深圳综合粒子设施研究院，广东深圳 518000

基金项目: 国家自然科学基金项目（11975300, 11775294, 11905275）

详细信息

作者简介:
涂凌君，lingjuntu@foxmail.com

通讯作者:
冯　超，fengchao@zjlab.org.cn

中图分类号: TL99
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-13
- 修回日期: 2021-08-27
- 网络出版日期: 2021-10-09
- 刊出日期: 2022-01-13

Simulation of generating attosecond water window band pulses by enhanced self-amplified spontaneous emission method

Tu Lingjun^{1, 2
,},
Feng Chao^{1, 3
, ,},
Wang Xiaofan⁴,
Zhao Zhentang^{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
4.
Shenzhen Integrated Particle Facility Research Institute, Shenzhen 518000, China

摘要

摘要: 脉冲宽度在百as（1 as=10⁻¹⁸ s）量级的X射线脉冲在超快科学领域有极为重要的作用。相较于目前世界上大部分运行在自发放大辐射模式的X射线自由电子激光（FEL），增强型自发放大辐射（ESASE）模式可以显著增加电子束的峰值流强，减小FEL的增益长度，可用来产生百as量级的超快X射线。基于典型的软X射线FEL参数，对ESASE方案的参数进行了模拟优化，得到了百as量级、功率可达1 GW以上、波长可在水窗波段且可调节的X射线脉冲，为后续开展ESASE实验及其实验参数的优化提供参考。
- 阿秒脉冲 /
- 超快X射线 /
- 增强型自发放大辐射 /
- X射线自由电子激光 /
- 水窗波段
Abstract: X-ray pulses of a few hundred attosecond play an important role in researches of ultra-fast science On enhanced self-amplified spontaneous emission (ESASE) mode. peak current of electron beams is much higher and the gain length is much shorter, in comparison with the self-amplified spontaneous emission mode in most running free electron laser (FEL) facilities. Based on typical parameters in soft X-ray free electron laser, this paper conducts an optimized simulation on ESASE. Simulation results show that hundreds attosecond X-ray of tunable wavelength in water window band is obtained, with a peak power of more than 1GW using a typical 2.5 GeV electron beam. This paper provides a reference to our following experiment on ESASE, and also sets a basis to the ongoing optimization of experimental parameters.
- attosecond pulse /
- ultra-fast X-ray /
- enhanced self-amplified spontaneous emission /
- X-ray free electron laser /
- water window band

HTML全文

图 1 ESASE示意图

Figure 1. Scheme of enhanced self-amplified spontaneous emission (ESASE)

下载: 全尺寸图片幻灯片

图 2 电子束经能量调制与密度调制后的能量分布

Figure 2. Energy distribution of electron beam after modulation

下载: 全尺寸图片幻灯片

图 3 电子束能量调制与密度调制结果后的流强和能散分布

Figure 3. Current profile and energy spread at 11.3 m undulator

下载: 全尺寸图片幻灯片

图 4 辐射段增益过程

Figure 4. Gain process in the radiator

下载: 全尺寸图片幻灯片

图 5 波荡器11.3 m处电子束能散和激光形状

Figure 5. Energy spread distribution and FEL pulse profile at 11.3 m undulator

下载: 全尺寸图片幻灯片

表 1 模拟用到的参数

Table 1. Parameters for simulation

initial beam parameters
average energy/GeV	2.5
average current/A	800
energy spread/%	0.01
RMS of horizontal position/μm	10
RMS of horizontal momentum/(m·s⁻¹)	1×10⁻⁶
modulative laser parameters
wavelength/nm	2400
maximum electric field intensity/(GV·m⁻¹)	5
FWHM/fs	8
wiggler & chicane parameters
period/cm	16
period number	1
K	39.27
R56/mm	0.75
undulator parameters
K	2.75
period/cm	3
period number	532

下载: 导出CSV

参考文献(17)

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