超热电子能量沉积的Fokker-Planck方程模拟  

Fokker-Planck Equation for Superthermal Electron Energy Deposition

作　　者：张华 李明强 彭力 何民卿[3] 吴思忠 周沧涛 ZHANG Hua;LI Mingqiang;PENG Li;HE Minqing;WU Sizhong;ZHOU Cangtao(Center for Advanced Material Diagnostic Technology,Shenzhen Technology University,Shenzhen,Guangdong 518118,China;College of Engineering Physics,Shenzhen Technology University,Shenzhen,Guangdong 518118,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]深圳技术大学先进材料测试技术研究中心,广东深圳518118 [2]深圳技术大学工程物理学院,广东深圳518118 [3]北京应用物理与计算数学研究所,北京100094

出　　处：《计算物理》2023年第2期222-231,共10页Chinese Journal of Computational Physics

基　　金：国家自然科学基金项目(12075033)资助。

摘　　要：围绕超热电子在高密度等离子体中传输和能量沉积问题,从相对论粒子碰撞基本物理出发,综合考虑相对论库伦碰撞和集体效应下等能量损失过程、背景等离子体电子回流和升温过程,建立超热电子相对论Fokker-Planck混合模型;构造直角-动量球坐标系下Fokker-Planck方程的有限体积算法,通过计算单能电子束在高密度等离子体中能量沉积和磁场产生过程,验证数值模拟程序。针对激光惯性聚变中超热电子的预加热效应,计算超热电子能量为单能和双麦氏分布情形下在靶丸中的能量沉积占比。We study the transport and energy deposition of superthermal electrons in high-density plasma,starting from the basic physics of relativistic particle collisions,considering relativistic Coulomb collisions and the collective effect,combined with the background plasma electron return and temperature equation,developed a hybrid model of the electronic relativistic Fokker-Planck equation.The finite volume algorithm of the Fokker-Planck equation in the rectangular-momentum spherical coordinate system is constructed,and the numerical algorithm and numerical simulation program are verified by calculating the energy deposition and magnetic field generation process of the monoenergetic electron beam in the high-density plasma.For evaluating of the preheat effects of superthermal electrons during the implosion process,the energy deposition processes and energy distributions in the implosion target under the single-energy and bi-Maxwellian energy spectrum are calculated.

关 键 词：相对论Fokker-Planck方程 电子束 超热电子 能量沉积 

分 类 号：O53[理学—等离子体物理]