通过理论分析和LARED多群辐射输运模拟研究了激光间接驱动聚变中黑腔辐射温度的角分布特点。研究发现, 黑腔辐射温度角分布主要决定于光斑区与非光斑区的对比度、视野中光斑区的面积比例, 以及体发射的份额。激光二维光环排布下黑腔辐射温度角分布与二维LARED模拟结果非常一致。研究还发现, 二维的LARED模拟能够有效地用于研究神光Ⅲ原型黑腔实验中三维光斑排布下的辐射温度角分布。通过缩小FXRD测量面积能够有效地提高黑腔辐射温度随角度的变化, 从而降低辐射流测量误差对辐射温度角分布的影响。

Hohlraum radiation flux is the source of the capsule implosion in the indirect drive fusion, which strongly affects the capsule compression properties. It is very important to study the angular distribution of the hohlraum radiation temperature in order to understand the radiation properties inside the hohlraum. In this work, the angular distribution of the hohlraum radiation temperature is studied through theoretical analysis and multi-group radiation transfer simulations with LARED. It is found that the angular distribution of the radiation temperature is mainly determined by the ratio of the radiation flux between the hot spot and non-spot region, the ratio of the hot spot area in the detected line of sight, and the component of the volume emission. The theoretical analysis agrees very well with the LARED simulation in the two dimensional laser cone case. It is found that the two dimensional LARED simulation can be effectively used to study the angular distribution of the radiation temperature in the SGⅢ-P hohlraum experiments with three dimensional laser spot structures. An improved method is proposed to measure the angular distribution of the radiation temperature with more significant variation of the radiation temperature.