激光入射孔径对柱形腔靶辐照不均匀度的影响
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摘要: 研究了激光入射孔径对柱形腔靶中 l=2阶靶丸辐照不均匀度的影响，计算得到了激光入射孔径对辐照不均匀度随时间变化的影响可以用源于某一固定点的一族曲线来描述。此固定点是由与激光光斑的位置决定的，与腔靶的半径和入射激光束的入射角有关，而与激光入射孔径的大小无关。辐照不均匀度随时间的变化是由激光光斑的辐射温度的变化和腔壁辐射温度的变化决定的，激光入射孔半径的大小影响着辐照不均匀度随时间变化的曲线的梯度，入射孔越大，曲线的梯度就越大。激光入射孔对l=2阶靶丸辐照不均匀度的影响与入射孔半径近似呈线性关系。Abstract: The influence of laser entrance holes?LEHs) radius on the capsule irradiation non-uniformity in cylindrical hohlraum has been studied. It is found that the influence of LEHs at on 2 order irradiation non-uniformity can be described by a family of curves that originate from a fixed point determined by position of laser spots but had nothing to do with LEHs, and that the radius of LEHs influence the grade of non-uniformity curve. The larger the radius is, the larger the grade of non-uniformity curve is. A semirandom simulation method was used to calculate the influence of LEHs on the capsule irradiation non-uniformity when other geometrical factors are given. Fitted the results, a linear relation between irradiation non-uniformity and radius of LEHs was found.
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Key words:
- cylindrical hohlraum /
- lehs /
- irradiation non-uniformity
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