高能高密度电子束在ICF稠密靶心区的输运参数研究

针对高能高密度电子束在ICF的稠密靶心区的输运，近年来国内外陆续发展了一些模拟程序（包括我们的三维PIC-Fluid混合模拟程序HEETS），其中输运参数都是基于一些理论模型，它们在大于100eV的高能区与实际符合得很好，但在低能区却相差很大。获得温稠密区域的输运参数是非常困难的，目前主要采用时变量子分子动力学TD-QMD方法计算输运参数，尽管精度较高，但计算量太大，只能提供少数数据点作为其它方法基准。通过TD-QMD的少量数据点难以拟合出整个温度、密度区间的2D曲面。本申请拟结合平均原子模型和流体统计模型, 发展一种计算量较小，具有合理精度的参数计算方法，并研制相应的计算程序。结合我们现有的HEETS程序，对ICF中的高能电子在高密度靶心区域的输运过程进行模拟研究，寻求增强超热电子能量沉积效率的方法。对解释ICF中的实验数据、设计物理实验具有实用价值。

It is crucial important to study the transport of high-energy and high-density electron beams in the dense core region in ICF. Recently, some simulation programs have been developed (including our three-dimensional PIC-Fluid hybrid simulation program HEETS), in which the transport parameters are based on some theoretical models. They are in good agreement with reality in high temperature regime (>100 eV), but differ greatly in low temperature regime. It is very difficult to obtain the transport parameters in the warm and dense region. The time dependent quantum molecular dynamics method TD-QMD is main method to obtain these transport parameters. The TD-QMD is accurate but very massive calculation, which is suitable to provide a few data points as the benchmark for other methods. Because the transport parameters usually change dramatically with ion density and electron temperature, it is difficult to fit a 2D surface of the entire temperature and density range with a small number of TD-QMD data points. This projection intends to develop a parameter calculation method by combining the average atomic model and fluid statistical model, which method can be expected a reasonable accuracy and modulate calculation cost. We will develop a corresponding code, which can be used in our existing HEETS program to study the transport process of fast electrons in dense core regime of ICF and to try to find some method of the enhancement of energy deposition of these fast electrons. Our projection is of practical value for interpreting experimental data in ICF and designing physical experiments.