动理学研究磁场对激光能量沉积和电子能量输运的影响

项目名称： 动理学研究磁场对激光能量沉积和电子能量输运的影响

项目编号： No.11305012

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 张桦森

作者单位： 北京应用物理与计算数学研究所

项目金额： 28万元

中文摘要： 激光能量沉积和电子能量输运在激光聚变和高能量密度物理中十分重要。激光在等离子体中传播时主要通过逆轫致吸收过程在临界面附近将能量传递给电子，形成一个空间急剧变化的电子能量分布并产生兆高斯量级的自生磁场。自生磁场对激光能量沉积和电子能量输运的影响，非局域电子的能量输运建模，一直是激光聚变极为关心但未完全认识的问题。本项目拟采用粒子模拟的方法，发展动理学模拟程序自洽地描述激光在等离子体中传播，能量沉积和电子能量输运的过程，重点研究磁场对激光能量沉积和电子能量输运的影响。该研究将促进激光能量沉积和电子能量输运问题物理建模的改进，有助于提高对激光聚变关键物理问题的认识。

中文关键词： 能量输运；能量沉积；激光等离子体相互作用；磁场；等离子体

英文摘要： Laser energy deposition and electron energy transport are very important in the laser fusion and high energy density physics. The laser energy is transferred to the electrons mainly through the inverse bresstrahlung process near the critical surface during its propagation in the plasmas. Therefore, a stongly nonuniform electron energy distribution and a magnetic field as large as several mega-Gauss are also generated. The effect of the self-generated magnetic field on the laser energy deposition and electron energy transport, and the modeling of the nonlocal electron energy transport always draw a lot of attention but are not completely understood. In this project, the kinetic simulation code will be developed using the particle-in-cell method to self-consistently describe the laser propagation, energy deposition and electron energy transport process. The effect of the magnetic field on the laser energy deposition and electron energy transport will be intensively investigated. This project will improve the modeling of the laser energy deposition and electron energy transport, and also the understanding of the key issues in the laser fusion.

英文关键词： energy transport；energy deposition；laser plasma interaction；magnetic field；plasma