Ta及Nanbu库仑碰撞模型数值对比研究  

Numerical comparison between Ta and Nanbu models of Coulomb collisions

作　　者：王辉辉[1] 杨超[1] 刘大刚[1] 蒙林[1] 刘腊群[1] 夏蒙重[1] 

机构地区：[1]电子科技大学物理电子学院,成都610054

出　　处：《物理学报》2013年第1期274-280,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60971034;11175040)资助的课题~~

摘　　要：深入研究库仑碰撞,对两种库仑碰撞模型—-Ta模型与Nanbu模型在理论上进行了对比分析,详细阐述了两种模型中散射角大小的区别.在已有的采用Ta模型的全三维粒子模拟/蒙特长罗(PIC/MCC)算法基础上,采用Nanbu模型对电子间库仑碰撞计算模块重新进行了算法设计.分别应用Ta模型、Nanbu模型和无库仑碰撞的全三维PIC/MCC算法对国外热门负氢离子源JAEA10A中的电子能量沉积进行了模拟分析.模拟结果与实验结果的对比分析发现:1)库仑碰撞使电子能量分布更接近于麦克斯韦分布;2)相对于传统的Ta模型,Nanbu模型的散射角考虑了多体碰撞的累加效果从而具有更高的期望值,按其模拟得到的电子温度具有更高的精度.这些为国内外学者设计相关算法指明了方向.Two models （Ta and Nanbu） of Coulomb collisions are compared theoretically, and the difference in scatter angle between Ta model and Nanbu model is analyzed particularly. The model of Coulomb collisions between electrons in the code which is developed already with Ta model is rebuilded with Nanbu model. Then, the codes with Ta model and Nanbu model are used for simulating electron energy distribution in JAEA 10 A respectively. The results of simulation are compared with the experimental results, showing that the electron energy distribution is closer to Maxwell distribution with Coulomb collisions and the Nanbu model is more accurate than the Ta model.

关 键 词：库仑碰撞 Ta模型和Nanbu模型 负氢离子源 电子能量沉积 

分 类 号：TL64[核科学技术—核技术及应用]