皮秒激光驱动微丝靶产生的超热电子能谱实验研究
DOI:
作者:
作者单位:

作者简介:

通讯作者:

基金项目:


Experimental Study on Ultra-thermal Electron Spectrum Generated by Picosecond Laser-driven Microwire Targets
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    目的 针对激光辐照平面靶中超热电子束流发散角过大以及产生的 X 光源亮度不足的问题,提出采用高功 率皮秒激光辐照微丝靶,研究电子再循环效应对超热电子束流和 X 光源特性的影响。 方法 实验在“ 星光-Ⅲ” 装置 皮秒束激光器上进行,分别采用直径 10 μm 的钼和金丝靶作为 X 射线背光源。 利用针孔相机在激光反射方向测量 X 光焦斑,靶前法线方向布置电子磁谱仪测量逃逸出靶的超热电子能谱。 结果 获得的 X 光焦斑的纵向尺寸最小值 达到 10 μm,与丝靶直径相当。 超热电子能谱结果显示自持独立钼丝和金丝中最高温度分别为 863 keV 和 816 keV,比对应的带 CH 衬底丝靶中的超热电子温度和数目均有显著提升。 结论 说明移除支撑丝靶的低密度衬底是 增强电子再循环效应的有效途径,通过这种方式能够提高超热电子束流的强度和集中度,增强轫致辐射强度,从而 获得微焦点和高亮度的 X 射线源。

    Abstract:

    Objective In response to the problem of excessive divergence angle of the ultra-thermal electron beam and insufficient brightness of the generated X-ray source in laser-irradiated planar targets a high-power picosecond laser was proposed to irradiate the microwire targets and the effects of electron recirculation on the characteristics of ultra-thermal electron beam and X-ray source were studied. Methods The experiment was carried out on the XGIII laser device. The molybdenum with a diameter of 10 μm and gold microwire targets were used as X-ray sources. A pinhole camera was used to measure the X-ray focal spot in the direction of laser reflection and an electron magnetic spectrometer was arranged in the normal direction of the target to measure the ultra-thermal electron energy spectrum of the escaped hot electron from the target. Results The minimum size of the X-ray focal spot obtained by the pinhole camera reached 10 μm which was equivalent to the diameter of the wire target. The ultra-thermal electron energy spectrum results showed that the maximum temperatures in the self-sustaining independent molybdenum wire and gold wire were 863 keV and 816 keV respectively which were higher compared with the corresponding temperatures and quantities of ultra-thermal electrons in wire targets with CH substrates. Conclusion The experimental results show that removing the low-density substrate of the support wire target is an effective way to accelerate the electron recirculate effect. In this way the intensity and concentration of the ultra-thermal electron beam can be improved which enhances the X-ray bremsstrahlung radiant intensity thus obtaining micro-focus and high-brightness X-ray sources.

    参考文献
    相似文献
    引证文献
引用本文

罗笔瀚,王洪建,罗登成,冯永祯.皮秒激光驱动微丝靶产生的超热电子能谱实验研究[J].重庆工商大学学报(自然科学版),2024,41(5):80-86
LUO Bihan, WANG Hongjian, LUO Dengcheng, FENG Yongzhen. Experimental Study on Ultra-thermal Electron Spectrum Generated by Picosecond Laser-driven Microwire Targets[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2024,41(5):80-86

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2024-09-29
×
2023年《重庆工商大学学报(自然科学版)》影响因子稳步提升