氘氚冰层对惯性约束聚变冷冻靶温度场分布的理论模拟

摘要

惯性约束聚变冷冻靶制备过程中,要求在靶丸内形成均匀光滑的氘氚冰层,需要靶丸周围存在均匀的热环境条件.对均匀冰层和非均匀冰层展开了数值模拟分析,讨论了冰层偏移对温度场的影响情况,通过对模拟结果的温度分布和流体力学分析,得到了冰层对冷冻靶温度场的影响规律.结果显示,氘氚冰层厚度的增加、体积热的增加都会造成靶丸温度不均匀性增大,冰层的偏移可以通过辅助加热的方式来改善,但是径向偏移对靶丸温度均匀性影响更大.%Inertial confinement fusion (ICF) design requires smooth and uniform deuterium-tritium (D-T) ice layers in a spherical shell and uniform thermal environment around the capsule.In this paper,numerical simulation analysis of uniform ice layer and non-uniform ice layer is carried out.By analyzing the temperature distribution and flow field of the simulation results,the influence of ice layer on temperature field of cryogenic target is obtained.The results show that with the increasing ice thickness,or increasing volume heat,the target temperature uniformity will deteriorate;the influence of the ice drift can be improved by applying auxiliary heating and the radial deviation of the ice layer has a greater effect on the uniformity of the target temperature.