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电子束长程传输中离子通道的振荡特性研究

薛碧曦 郝建红 赵强 张芳 范杰清 董志伟

薛碧曦, 郝建红, 赵强, 等. 电子束长程传输中离子通道的振荡特性研究[J]. 强激光与粒子束, 2021, 33: 093006. doi: 10.11884/HPLPB202133.210187
引用本文: 薛碧曦, 郝建红, 赵强, 等. 电子束长程传输中离子通道的振荡特性研究[J]. 强激光与粒子束, 2021, 33: 093006. doi: 10.11884/HPLPB202133.210187
Xue Bixi, Hao Jianhong, Zhao Qiang, et al. Oscillation properties of ion channel during long-range propagation of electron beam[J]. High Power Laser and Particle Beams, 2021, 33: 093006. doi: 10.11884/HPLPB202133.210187
Citation: Xue Bixi, Hao Jianhong, Zhao Qiang, et al. Oscillation properties of ion channel during long-range propagation of electron beam[J]. High Power Laser and Particle Beams, 2021, 33: 093006. doi: 10.11884/HPLPB202133.210187

电子束长程传输中离子通道的振荡特性研究

doi: 10.11884/HPLPB202133.210187
基金项目: 国家自然科学基金项目(61372050,U1730247)
详细信息
    作者简介:

    薛碧曦(1991—),男,博士生,主要从事粒子束传输等研究

    通讯作者:

    赵 强(1975—),男,博士,副研究员,主要从事电磁波传输机理与数值模拟研究

  • 中图分类号: O46

Oscillation properties of ion channel during long-range propagation of electron beam

  • 摘要: 离子通道可以有效抑制电子束在等离子体环境内传输过程中的径向扩散,已有工作研究了离子通道对电子束的影响,但离子通道建立过程和暂态特性研究则更有助于理解和利用离子通道在电子束长程传输中的作用。本文利用PIC方法对离子通道的时空分布进行二维模拟,并基于单粒子理论推导出描述离子通道振荡的解析模型,对上述两种模型的结果相互校验。上述模型的计算结果表明,在长程传输过程中,相对论电子束在等离子体内部建立的离子通道是持续周期振荡的,电子束密度、电子束初始半径以及环境等离子体密度都会对离子通道的振荡规律产生影响,针对不同的等离子体环境选择合适的电子束参数可以有效提高离子通道的稳定性,进而提升传输过程中电子束的束流质量。
  • 图  2  离子通道的径向结构

    Figure  2.  Radial structure of the ion channel

    图  1  离子通道振荡示意图

    Figure  1.  Schematic of ion channel oscillation

    图  3  电子束密度与等离子体密度接近($\varepsilon $较小)时离子通道的分布

    Figure  3.  Ion channel when the beam density is close to the plasma density

    图  4  $\varepsilon = 3$时离子通道的分布,${n_{\rm{p}}} = 6.2 \times {10^{14}}\;{{\rm{m}}^{ - 3}}$${r_{{\rm{b}}0}} = 3\;{\rm{ cm}}$

    Figure  4.  Ion channel when $\varepsilon = 3$, ${n_{\rm{p}}} = 6.2 \times {10^{14}}\;{{\rm{m}}^{ - 3}}$ and ${r_{{\rm{b}}0}} = 3\;{\rm{ cm}}$

    图  5  $\varepsilon = 5$时离子通道的分布,${n_{\rm{p}}} = 6.2 \times {10^{14}}\;{{\rm{m}}^{ - 3}}$${r_{{\rm{b}}0}} = 3\;{\rm{ cm}}$

    Figure  5.  Ion channel when $\varepsilon = 5$, ${n_{\rm{p}}} = 6.2 \times {10^{14}}\;{{\rm{m}}^{ - 3}}$ and ${r_{{\rm{b}}0}} = 3\;{\rm{ cm}}$

    图  6  ${r_{{\rm{b}}0}} = 5\;{\rm{ cm}}$时离子通道的分布,${n_{\rm{p}}} = 6.2 \times {10^{14}}\;{{\rm{m}}^{ - 3}}$$\varepsilon = 3$

    Figure  6.  Ion channel when ${r_{{\rm{b}}0}} = 5\;{\rm{ cm}}$, ${n_{\rm{p}}} = 6.2 \times {10^{14}}\;{{\rm{m}}^{ - 3}}$ and $\varepsilon = 3$

    图  7  ${n_{\rm{p}}} = 6.2 \times {10^{1{\rm{5}}}}\;{{\rm{m}}^{ - 3}}$时离子通道的分布,${r_{{\rm{b}}0}} = {\rm{3\; cm}}$$\varepsilon = {\rm{5}}$

    Figure  7.  Ion channel when ${n_{\rm{p}}} = 6.2 \times {10^{1{\rm{5}}}}\;{{\rm{m}}^{ - 3}}$, ${r_{{\rm{b}}0}} = {\rm{3\; cm}}$ and $\varepsilon = {\rm{5}}$

    表  1  电子束及等离子体环境的基本初始参数

    Table  1.   Initial parameters of the electron beam and plasma environment

    initial beam radius ${r_{ {\rm{b0} } } }$/cminitial beam energy ${E_0}$ MeVinitial beam emittance ${\varepsilon _ \bot }$/(mm*mrad)$\varepsilon $plasma density ${n_{\rm{p}}}$/${{\rm{m}}^{ - 3}}$
    3, 5100.21~5$6.2 \times {10^{10}}\sim 6.2 \times {10^{15}}{\rm{ }}$
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出版历程
  • 收稿日期:  2021-05-17
  • 修回日期:  2021-07-04
  • 网络出版日期:  2021-07-27
  • 刊出日期:  2021-09-24

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