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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

涂凌君, 冯超, 王晓凡, 等. 产生超快水窗波段X射线的ESASE方案模拟[J]. 强激光与粒子束, 2022, 34: 031019. doi: 10.11884/HPLPB202234.210282
引用本文: 涂凌君, 冯超, 王晓凡, 等. 产生超快水窗波段X射线的ESASE方案模拟[J]. 强激光与粒子束, 2022, 34: 031019. doi: 10.11884/HPLPB202234.210282
Tu Lingjun, Feng Chao, Wang Xiaofan, et al. Simulation of generating attosecond water window band pulses by enhanced self-amplified spontaneous emission method[J]. High Power Laser and Particle Beams, 2022, 34: 031019. doi: 10.11884/HPLPB202234.210282
Citation: Tu Lingjun, Feng Chao, Wang Xiaofan, et al. Simulation of generating attosecond water window band pulses by enhanced self-amplified spontaneous emission method[J]. High Power Laser and Particle Beams, 2022, 34: 031019. 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
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

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

  • 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。
  • 图  1  ESASE示意图

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

    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

    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

    图  4  辐射段增益过程

    Figure  4.  Gain process in the radiator

    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

    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
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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

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