Effects of Alpha Particle Stopping-Power Models on Inertial Confinement Fusion Implosions
Effects of Alpha Particle Stopping-Power Models on Inertial Confinement Fusion Implosions
复制标题
阿尔法粒子阻止本领模型对惯性约束聚变内爆的影响
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
S. X. Hu
中科院分区：
文献类型：
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作者：
N. Xu;Pittsford Sutherland;S. X. Hu
惯性约束聚变（ICF）内爆实验设计中的一个重要问题是计算α粒子在等离子体中的能量沉积率。在这个项目中，基于不同的物理近似，研究了四种不同的阻止本领（能量沉积）模型：Skupsky模型（目前用于激光能量学实验室的流体编码），Li-Petrasso模型，量子分子动力学模型和Brown-Preston-Singleton模型。这些模型已被测试为不同的氘氚（DT）等离子体条件，如温度，密度和初始α粒子能量。这些模型已被实施到一维水力代码LILAC中，从而可以研究它们对国家点火设施规模点火内爆的影响。与预期相反的是，结果显示，在整体目标性能的显着差异，这取决于所使用的模型，目标增益的差异变化的一个因素。最后，一个实验已经提出来验证哪个模型，如果有的话，是真正有效的。
An important issue in the design of inertial confinement fusion (ICF) implosion experiments is calculating the proper energy-deposition rate of the alpha particles as they travel through the plasma. In this project, four different models of stopping power (energy deposition), based on different physics approximations, have been examined: the Skupsky model (currently used in Laboratory for Laser Energetics' hydrocodes), the Li-Petrasso model, the quantum molecular dynamics model, and the Brown-Preston-Singleton model. These models have been tested for different deuterium-tritium (DT) plasma conditions such as temperature, density, and initial alpha particle energy. The models have been implemented into the one-dimensional hydro-code LILAC, allowing their effects on National Ignition Facility-scale ignition implosions to be investigated. Contrary to what was expected, the results show significant differences in the overall target performance depending on which model is used; differences in target gain vary by a factor of two. Finally, an experiment has been suggested to verify which model, if any, is truly valid.