金锥对靶背向超热电子分布的影响
Influnce of Au cone on distribution of forward hot electrons
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摘要: 采用20 TW啁啾脉冲放大的ps激光辐照金锥靶和平面靶，对靶背向产生的超热电子角分布和能谱进行了实验研究。结果表明:金锥对超热电子的产生具有重要的影响。与平面靶情况相比，锥形靶靶背向产生的超热电子数量增加，电子能量为2.0~2.5 MeV的超热电子数目有大幅度增长；锥形靶背向超热电子的空间发散角大于平面靶,这是由于啁啾脉冲放大激光所固有的较高脉冲前沿产生的预等离子体造成的影响。Abstract: The 30° Au conical target and Au foil target were irradiated by 20 TW ps P-polarized laser plasma, the characteristics of the forward produced hot electrons were studied. The hot electron number of the cone target was larger than that of the foil target, especially within the range of 2.0~2.5 MeV. The divergence of the forward hot electrons of the cone target was larger than that of the plane one, which was caused by different electron density of the pre-plasma with dissimilar target geometry produced by the driving laser.
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Key words:
- fast ignition /
- au conical target /
- hot electron /
- energy spectra /
- angular distribution
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