超强飞秒激光驱动气体靶致X光源的背光成像

朱巍; 叶雁; 朱鹏飞; 刘振清; 夏长权; 沈百飞; 梁晓燕; 冷雨欣; 钱伟新; 李军; 李泽仁; 李作友; 彭其先

doi:10.3788/HPLPB20122411.2651

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超强飞秒激光驱动气体靶致X光源的背光成像

doi: 10.3788/HPLPB20122411.2651

1.
中国工程物理研究院流体物理研究所,四川绵阳 621 900;
2.
中国科学院上海光学精密机械研究所,上海 201 800

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- 被引次数: 0
出版历程
- 收稿日期: 2011-12-09
- 修回日期: 2012-05-29
- 刊出日期: 2012-11-01

Backlight imaging by X-ray irradiation from high-intensity femtosecond-laser driven gas targets

1.
Institute of Fluid Physics,CAEP,P.O.Box 919-105,Mianyang 621900,China;
2.
Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China

摘要

摘要: 在拍瓦级飞秒激光装置上完成了两轮激光驱动甲烷气体靶的实验，用产生的X光源配合SCCD（转换屏+CCD相机）对小型金属器件背光成像，采用经验公式和PIC数值模拟方法分别预估了超热电子温度，得到X光能量分别为377 keV和130 keV，据此两轮实验分别选择1.3 mm和0.8 mm厚度的轫致辐射体。分析比较了两轮实验背光成像质量。通过对次轮实验图像中铝、铜金属台阶灰度值曲线的分析求得X光的能量分别为49 keV和92 keV，这表明采用PIC数值模拟方法得到的X光能量更加符合实验结果。
- 飞秒激光 /
- 气体靶 /
- 团簇 /
- X光 /
- 超热电子 /
- 能谱
Abstract: Two experiments of laser-driven methane jet are performed on a petawatt laser, and the X-ray emitted is used to backlight small-size metal objects with SCCD(scintillator screen + CCD camera). Converters with different thicknesses are chosen considering the temperature of hot electrons which is evaluated both by the empirical formula and by the particle-in-cell (PIC) code. The X-ray energies of 377 keV and 130 keV are estimated by the two methods respectively. Consequently, converters with 1.3 mm and 0.8 mm thicknesses are chosen. Photon energies of 49 keV and 92 keV are obtained by grayscale curves of aluminum and copper step-wedges in the second experiment. It is demonstrated that the photon energy deduced from the PIC code agrees with the experimental result.
- femtosecond laser /
- gas target /
- cluster /
- X-ray /
- hot electrons /
- energy spectrum