低频Alfvén波对等离子体非共振加热与随机加热的粒子模拟  

Particle Simulation on Non-resonance and Stochastic Heating of Ions with Low-frequency Alfvén Waves

作　　者：李克华[1,2] 龚学余[1] 路兴强[1] 李景春[1] 

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]成都理工大学工程技术学院核工程与核技术系,四川乐山614000

出　　处：《计算物理》2012年第5期739-744,共6页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11075073;41104094);国家973ITER专项(2009GB105002);湖南省教育厅(10C1152)资助项目

摘　　要：采用粒子模拟方法,研究沿背景磁场方向传播的低频Alfvén波对磁化等离子体加热的物理过程.模拟结果表明:离子在垂直和平行于背景磁场的方向都得到明显的加热,在非共振加热阶段,垂直方向比平行方向的加热效果更加显著,形成温度各向异性;在随机加热阶段,垂直和平行方向的温度最终达到饱和且趋于一致.加热过程中,离子所获得动力学温度的最大值由外加磁场能量密度与等离子体密度的比值决定,与Alfvén波的频率及振幅无关;离子在平行于背景磁场方向上被加速,并最终获得相当于Alfvén波相速度大小的流速.Heating of magnetized plasmas by low-frequency Alfven waves propagating along background magnetic field is studied with test particle simulation. It shows that ions in perpendicular and parallel directions of the background magnetic field are heated significantly. In a stage of non-resonance heating, perpendicular heating is more significant than parallel heating, and anisotropic temperature comes into being. In a stage of stochastic heating, perpendicular and parallel temperatures of ions finally reach saturation and convergence. In heating process, the maximum kinetic temperature of ions is dependent on the ratio of magnetic field energy density and plasma density, which has no relevance with Alfven-wave frequency and amplitude. Ions are significantly accelerated in parallel direction, and attained a bulk speed that is roughly equal to phase velocity of Alfven waves.

关 键 词：粒子模拟 低频Alfvén波 非共振加热 随机加热 

分 类 号：O53[理学—等离子体物理]