考虑碰撞的j×B方法离子引出的数值模拟  

Simulation of AVLIS ion collection using a j×B driven system including collisions

作　　者：朱红莲[1] 王德武[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第5期587-590,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九五"科技攻关项目 ( 96 -A18-0 1-0 2 )

摘　　要：原子蒸气激光分离同位素 (AVL IS)离子引出有许多种方法 ,j× B驱动方法是一种新方法。研究该方法考虑离子碰撞时的物理模型 ,并用二维流体理论电子平衡模型对j× B驱动方法进行数值收集模拟 ,与不考虑碰撞时的结果进行比较。模拟结果表明 ,该引出方法中的碰撞效应不可忽略。模拟了电子温度 ,初始原子密度和驱动线电流变化率对离子引出时间和碰撞损失率的影响 ,并与平行板电场法和改进 M型电极法进行了比较 :j× B驱动电极法在引出时间上要比改进 M型电极法和平行板电极法要短得多 ,但碰撞损失率略大。总体上 j×With atomic vapor laser isotope separation (AVLIS), the ions can be separated in many ways. This article analyzes the physics of a new scheme where the ion beam is controlled by the current(J) and the magnetic field(B). The two-dimensional MHD model including collisions was used to simulate particles with and without collisions. The results show that the charge exchange between particles can not be neglected. The analysis simulates how the electron temperature, atom density and current density affect the ion collection. Compared with the parallel electrode and the M electrode, the j×B driven system has shorter ion collection time but a slightly larger loss rate. Overall, the j×B driven system is better.

关 键 词：离子引出 数值模拟 离子收集 j×B驱动方法 共振电荷转移 铀原子 原子蒸气激光分离同位素 碰撞损失率 

分 类 号：TL253[核科学技术—核燃料循环与材料] O562.5[理学—原子与分子物理]