潘宁阱中电子等离子体稳态的数值模拟  

NUMERICAL SIMULATION OF THE STEADY STATE OF ELECTRON PLASMAS IN THE ELECTRON BEAM PENNING TRAP

作　　者：付成江[1] 刘万东[1] 杨维宏[1] 庄革[1] 谢锦林[1] 于治[1] 迟霁[1] 郑坚[1] 赵凯[1] 赵淑君[1] 俞昌旋[1] 

机构地区：[1]中国科学技术大学近代物理系,合肥230027

出　　处：《核聚变与等离子体物理》2001年第3期153-159,共7页Nuclear Fusion and Plasma Physics

基　　金：自然科学基金项目 (195 85 0 0 4 ;19975 0 4 7) ;教育部优秀年轻教师基金;中国科学院基础研究青年小组基金资助项目

摘　　要：应用粒子模拟方法研究了电子束潘宁阱中的非中性等离子体的稳定状态及其定标关系。数值模拟结果表明 ,给定电子的初始分布和外场条件后 ,潘宁阱中可以出现聚心状态的电子等离子体 ,中心电子密度可达 10倍布里渊密度 ;电子密度分布与理想的 1 r2 关系有差别 ,阱中的电子数越多 ,差别越大。A particle in cell code has been developed to simulate the steady state of electron plasmas in an electron beam Penning trap and to study its scaling law.Results show that electron plasma with a dense core appears in the trap under given distribution for initial electrons and applied electric field,and its core electron density can be 10 times of Brillouin density which is independent of the amount of initially injected electrons and is proportional to the applied electric field.The density profile in the trap is not exactly the ideal one of 1/r 2.The more the electrons in the trap are,the larger the discrepancy in the profile is.The relaxation time for the system steady state is proportional to the applied electrical field and inversely proportional to the amount of electrons in the trap.

关 键 词：粒子模拟 潘宁阱 布里渊密度 电子等离子体 稳态 数值数拟 聚变 

分 类 号：TL612.11[核科学技术—核技术及应用]