Hybrid Particle-in-Cell/Fluid Model for Hot Electron Transport in Dense Plasmas

Abstract

Abstract: One of key issues in high energy density physics is clarification of transport and energy deposition of laser-produced fast electrons traveled through dense plasma. However, modeling these systems numerically is still a great challenge. In this paper, we introduce a PIC/fluid hybrid model. In this hybrid method, fast electrons are modeled by a relativistic Fokker-Planck equation, which numerically solved by reducing it to equivalent stochastic differential equations. Background electrons and ions are treated as two-fluid model. Collisions, electric and magnetic fields, and evolutions of resistivity due to heating of background are included. Treatment is valid for fast electron number densities much less than that of background, fast electron energies much greater than background temperature, and time scales short enough that magnetic diffusion and thermal conduction can be negligible. Model of ionization and resistivity also determine validity of the model.

Key words: high energy density physics, fast electron transport, hybrid PIC/fluid

CLC Number:

XU Han, ZHUO Hongbin, YANG Xiaohu, HOU Yong, YIN Yan, LIU Jie. Hybrid Particle-in-Cell/Fluid Model for Hot Electron Transport in Dense Plasmas[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2017, 34(5): 505-525.

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