激光直接驱动聚变球靶初始辐照均匀性分析

Analysis of Initial Irradiation Uniformity on Spherical Target in Direct Drive Laser Fusion

采用Ｓｋｕｐｓｈｙ－Ｌｅｅ（Ｓ－Ｌ）球谐模分解方法，按一个简化的物理模型，对激光直接驱动聚变中不同束－靶条件下的靶面初始辐照不均匀度的均方根偏差进行了数值计算，由此分析了在光束完全对称排布的多光束辐照系统中，光束截面光强分布、聚焦透镜Ｆ数、离焦参数（靶心离焦距离与靶丸半径之比）、光束数这几个主要因素对辐照均匀性的影响。

The initial irradiation nonuniformity of spherical target is calculated for different laser target conditions, to analyze the influence of different parameters such as the beam intensity profile, lens F number, defocusing parameter and the number of laser beams on irradiation uniformity of spherical target in perfectly symmetric multi beam irradiation system.