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针对相对论快电子束在高密度压缩芯区等离子体中的能量沉积过程开展物理建模、程序研制和数值模拟研究。从等离子体粒子碰撞的基本物理出发,综合考虑了高能电子与背景等离子体之间的短程两体碰撞过程和长程集体效应,建立了相对论Fokker-Planck动理学模型,通过采用球谐展开的方法,推导得到了适于数值求解的方程形式并根据方程特点开展相应的数值算法研究及程序研制并完成了物理考核,对快点火能量沉积的典型物理算例进行了模拟研究,并针对即将在神光Ⅱ升级装置上开展的快点火物理实验进行了初步的物理分析。
Aiming at the energy deposition process of the relativistic fast electron beam in the high-density compressed core plasma, physical modeling, program development and numerical simulation are studied. Based on the basic physics of plasma particle collision, the relativistic Fokker-Planck kinetic model is established by considering the short-range two-body collision process and long-range collective effect between high-energy electron and background plasma. By using spherical harmonic expansion method, Deduced the equation form suitable for numerical solution and carried out corresponding numerical algorithm research and program development according to the characteristics of the equation and completed the physical examination. The typical physical examples of rapid fire energy deposition were simulated. Ⅱ upgrade device carried out on the fast fire physics experiments conducted a preliminary physical analysis.