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填充预等离子体通道靶激光电子加速研究

王子涛 周维民 邓志刚 宋尧祥

王子涛, 周维民, 邓志刚, 等. 填充预等离子体通道靶激光电子加速研究[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.220067
引用本文: 王子涛, 周维民, 邓志刚, 等. 填充预等离子体通道靶激光电子加速研究[J]. 强激光与粒子束. doi: 10.11884/HPLPB202234.220067
Wang Zitao, Zhou Weimin, Deng Zhigang, et al. Laser electron acceleration in pre-plasma-filled channel targets[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.220067
Citation: Wang Zitao, Zhou Weimin, Deng Zhigang, et al. Laser electron acceleration in pre-plasma-filled channel targets[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202234.220067

填充预等离子体通道靶激光电子加速研究

doi: 10.11884/HPLPB202234.220067
基金项目: 国家自然科学基金项目(11775202)
详细信息
    作者简介:

    王子涛,wzt12345@mail.ustc.edu.cn

    通讯作者:

    周维民,zhouwm@caep.cn

    邓志刚,dzgzju@163.com

  • 中图分类号: O434.12

Laser electron acceleration in pre-plasma-filled channel targets

  • 摘要: 采用紧聚焦的超强短脉冲激光与固体通道靶相互作用是获得大电量、高准直相对论电子束的一种有效方式。实验中由于激光预脉冲烧蚀靶壁产生预等离子体会膨胀、填充到真空通道中,从而导致电子束品质发生变化。采用二维PIC粒子模拟程序研究了通道靶中填充预等离子体的电子加速过程。模拟结果显示,在功率密度为5.0$ \times {10}^{20}\;{\mathrm{W}/\mathrm{c}\mathrm{m}}^{2} $的超强短脉冲激光条件下,通道中填充一定密度的等离子体时激光场优先与低密度等离子体相互作用,激光脉冲与通道壁的相互作用减弱,电子加速机制由纵向场主导的真空电子加速转变为横向电场主导的等离子体电子加速,产生电子束具有更大的电荷量,但能量降低,发散角增大。
  • 图  1  模拟示意图,激光脉冲同轴注入填充等离子体通道靶

    Figure  1.  Schematic of the channel target. Laser pulse injects coaxially to pre-plasma filled channel target

    图  2  电子数密度及电子能谱分布

    Figure  2.  Electron number density and electron spectral distribution

    图  3  电子束角分布统计

    Figure  3.  Statistics of electron beam angle distribution

    图  4  电场对电子束做功统计

    Figure  4.  Statistics of work done by the electric field on the electron beam

    图  5  电子束电荷量统计

    Figure  5.  Statistics of electron beam charge

    图  6  $ t=480\;\mathrm{f}\mathrm{s} $时刻不同填充等离子体密度下通道内电子束统计

    Figure  6.  Statistics of electron beams in the channel under different filling plasma densities at t=480 fs

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出版历程
  • 收稿日期:  2022-03-13
  • 录用日期:  2022-06-10
  • 修回日期:  2022-05-23
  • 网络出版日期:  2022-06-13

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