辐射烧蚀铝箔数值模拟研究
Numerical simulation of radiation ablating aluminum foils
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摘要: 利用一维多群辐射输运程序RDMG数值模拟神光Ⅱ条件下辐射烧蚀铝箔的实验研究,详细描述了X光在铝箔中的辐射输运过程,清楚地显示了辐射热波在铝箔中的传播;给出铝等离子体温度密度的时空分布、铝箔背面出射的X光能谱及出射X光各能区能流随时间的变化,分析出射X光的能区对测量结果的影响,对神光Ⅱ条件下辐射烧蚀铝箔的厚度范围进行初步的探讨。数值结果与实验结果相吻合。Abstract: We simulated radiation ablating Aluminum foil by using 1D muti-group code(RDMG). With intense laser beams heating a gold hohlraum, the X-ray with intensity of 0.71×1014W*cm-2 and pulse width 1.0ns emits from the hohlraum ablating 1.5μm and 3μm thick aluminum foil. The simulation investigates the radiation energy transport in hot dense medium-Z matter (aluminum) and clearly shows the process of radiation heat wave passing through the aluminum foil. It has shown the sudden onset of X-ray flux from rear side of aluminum foil observed by experiments. The burn-through times predicted by the simulation fit well with the experimental results.
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