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首页> 外文期刊>Plasma physics and controlled fusion >Electron bunching induced by betatron resonance in a picosecond laser driven plasma channel
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Electron bunching induced by betatron resonance in a picosecond laser driven plasma channel

机译：在Pic秒激光驱动等离子体通道中由Betatron谐振引起的电子束缚

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摘要

In direct laser acceleration, the spatial distribution of electrons will become bunched periodically. This bunching has been regarded to be caused by forced oscillations driven by the laser field. In this paper we report on the generation of electron bunching in a picosecond laser driven plasma channel. In our case, the bunched electrons are caused by betatron resonance, not forced oscillations. Due to the resonance, electrons are kept in phase with the laser field, which leads to similar trajectories in the laser field for the most energetic electrons. Furthermore, these electrons will cross the laser axis with an equal slope induced by the equal electron transverse velocity in the direct laser acceleration regime, which also aids the formation of the bunched electrons. We find that a quasi-static longitudinal electric field exists in the second half of the plasma channel, which provides a pre-acceleration process for the electron before the resonance condition is matched. The electron transverse velocity decreases dramatically during the pre-acceleration process and the decrease of electron transverse velocity is the key point to match the resonance condition.
机译：在直接激光加速下，电子的空间分布将定期变为束缚。这种聚集被认为是由激光场驱动的强制振荡引起的。在本文中，我们报告了在皮秒激光驱动等离子体通道中的电子束的产生。在我们的情况下，束缚的电子是由Betatron谐振引起的，而不是强制振荡引起的。由于谐振，电子与激光场保持相位，这导致激光场中的类似轨迹，用于最有能量的电子。此外，这些电子将通过直接激光加速度的等于电子横向速度诱导的相等斜率来交叉激光轴线，这也有助于形成束缚的电子。我们发现，等离子体通道的后半部分存在准静态纵向电场，其在谐振条件匹配之前为电子提供预加速度处理。在预加速过程期间电子横向速度显着降低，并且电子横向速度的降低是匹配共振条件的关键点。

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  • 来源
  • 作者

    Zhang Xiaohui; Hua Jianfei; Zhang Zhimeng; Qi Wei; Zhu Bin; Tan Fang; Wu Yuchi; Lu Wei; Gu Yuqiu;

  • 作者单位

    Tsinghua Univ Dept Engn Phys Beijing 100084 Peoples R China;

    Tsinghua Univ Dept Engn Phys Beijing 100084 Peoples R China;

    China Acad Engn Phys Laser Fus Res Ctr Sci &

    Technol Plasma Phys Lab Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Laser Fus Res Ctr Sci &

    Technol Plasma Phys Lab Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Laser Fus Res Ctr Sci &

    Technol Plasma Phys Lab Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Laser Fus Res Ctr Sci &

    Technol Plasma Phys Lab Mianyang 621900 Sichuan Peoples R China;

    China Acad Engn Phys Laser Fus Res Ctr Sci &

    Technol Plasma Phys Lab Mianyang 621900 Sichuan Peoples R China;

    Tsinghua Univ Dept Engn Phys Beijing 100084 Peoples R China;

    China Acad Engn Phys Laser Fus Res Ctr Sci &

    Technol Plasma Phys Lab Mianyang 621900 Sichuan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    direct laser acceleration; electron bunching; betatron resonance;

    机译：直接激光加速度;电子束缚;Betatron共鸣;

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