光束路径排布对称性与光功率分布均匀性

Geometric Symmetry of the Laser Beam's Arrangement Scheme on the Surface of a Ball Target

报道了６０路激光束的入射窗在球形靶室上的经度和纬度的计算方法。以靶丸表面激光功率分布的几何均匀性为判据，分析结果表明：靶区光路排布“凸３２ 面体模型”中的不等边六边形的邻边边长比例因子为１．１４～１．２５ 时，入射光束空间排布的几何对称性达到最佳状态，直接驱动的辐照均匀性亦随之得到改善。

A computation method of longitudes and latitudes of incident windows for the 60 laser beams on the spherical target charmber is reported. It is shown analytically that when the length ratio between the neighboring sides of hexagonal faces on the 32 face polyhedron inscribed in the chamber′s spherical faces equals 1.14~1.25, according to the criterion of irradiation uniformity on target for the “stretched soccer ball” model, the geometrical symmetry of the spatial arrangement of the beams comes to the optimum condition, and thus the irradiation uniformity of direct drive is improved.