用于中子管的微波离子源放电特性的仿真研究  

Simulation Study on Discharge Characteristics of Microwave Ion Source for Neutron Tube

作　　者：金明远 曲婉菊 赵辰一 乔双[1] Jin Mingyuan;Qu Wanjv;Zhao Chenyi;Qiao Shuang(School of Physics,Northeast Normal University,Changchun 130024,China)

机构地区：[1]东北师范大学物理学院,长春130024

出　　处：《真空科学与技术学报》2020年第3期245-249,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金资助项目(11275046);国家重大科学仪器设备开发专项资助项目(2013YQ040861);电子元器件可靠性物理及其应用技术重点实验室开放基金资助项目(ZHD201701);吉林省科技厅优秀青年人才基金项目(20190103010JH);吉林省教育厅“十三五”科学技术研究规划项目(JJKH20190277KJ);中国博士后科学基金面上项目(2018M641759)。

摘　　要：微波离子源作为一种无阴极离子源,与潘宁离子源相比具有电离度高、形成的等离子体密度高、寿命长等优点。为了深入了解用于中子管微波离子源的放电特性,根据微波离子源的放电原理,设计中子管微波离子源的几何结构和所需磁铁的结构。结合Comsol多物理场仿真软件中的二维轴对称的AC/DC模块和微波等离子体模块,采用控制变量法,通过仿真实验探究了放电气压、微波输入功率、放电腔室大小以及放电腔室外壁材料对电子密度的影响,总结了电子密度在不同参数下的规律,将为中子管微波离子源的实验和设计提供重要支撑。The discharge in cavity of microwave ion source,an advanced component of neutron tube,was mathematically modeled,theoretically analyzed and numerically simulated with software Comsol for design optimization.The influence of the discharge conditions,including the magnetic field profile,pressure,microwave input power,size and layered materials of cavity-wall,on the electron density was investigated.The results show that a descending impact-factor may exist:magnetic-field distributions > pressure > cavity surface material > cavity-size(microwave-power).For example,the triple permanent-magnet rings provide the gyromagnetic field and confinement of electron and ions;and as the pressure increases,e-density significantly increased.The effect of the microwave power,size and surface property of cavity wall on the e-density was also tentatively discussed.We suggest that the simulated results be of some basic and technological interest in design optimization of neutron tube.

关 键 词：中子管 微波离子源 电子密度 仿真模拟 

分 类 号：TN919[电子电信—通信与信息系统]