| 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/M/D/N,J:杂志，M：书，D：论文，N：报纸).期刊名称,2024，41（5）：80-86 |
| CHEN X. Adap tive slidingmode contr ol for discrete2ti me multi2inputmulti2 out put systems[ J ]. Aut omatica, 2006, 42(6): 4272-435 |
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| 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。 |
| 关键词: 皮秒激光 超热电子能谱 微丝靶 X 光源 电子加速机制 |
| DOI： |
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| 基金项目: |
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| Experimental Study on Ultra-thermal Electron Spectrum Generated by Picosecond Laser-driven MicrowireTargets |
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LUO Bihan, WANG Hongjian, LUO Dengcheng, FENG Yongzhen
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1. Smart Manufacturing Institute of Robot and Laser Chongqing Technology and Business University Chongqing 400067
China
2. Chongqing Key Laboratory of Manufacturing Equipment Mechanism Design and Control Chongqing Technology and
Business University Chongqing 400067 China
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| 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. |
| Key words: picosecond laser ultra-thermal electron spectrum microwire target X-ray source electron acceleration
mechanism |
