含氘电极真空弧等离子体空间分布特性诊断研究  

Spatial distribution characteristics of vacuum arc plasma with occluded deuterium electrode

作　　者：李杰[1,2] 郑乐 董攀 龙继东[1] 王韬[1] 刘飞翔[1] Li Jie;Zheng Le;Dong Pan;Long Ji-Dong;Wang Tao;Liu Fei-Xiang(Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China;Graduate School of CAEP,Mianyang 621900,China;Sichuan XW Bank,Chengdu 610000,China)

机构地区：[1]中国工程物理研究院流体物理研究所,绵阳621900 [2]中国工程物理研究院研究生院,绵阳621900 [3]四川新网银行股份有限公司,成都610000

出　　处：《物理学报》2022年第4期27-33,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11735012,11975217)资助的课题。

摘　　要：真空弧放电等离子体含有多种离子成分,并且各离子在空间上具有不同的分布规律.本文针对金属氘化物电极真空弧离子源,搭建了一台紧凑型磁分析装置,用来研究放电等离子体中氘离子与金属离子的空间分布.当离子源弧流为100 A左右时,该装置能有效地传输引出束流,并且具有较好的二次电子抑制效果,可准确获得各离子流强.利用该装置测量并获得了氘化钛含氘电极真空弧放电等离子体内氘离子和钛离子空间分布规律,结果表明:径向上,氘离子和钛离子都呈高斯分布,但氘离子分布均匀,而钛离子相对集中在轴线附近,导致轴线附近氘离子比例最低;轴向上,所有离子数量都以自然指数函数减少,而且相对幅度接近,所以氘离子比例几乎不变.本文研究结果不仅有助于理解真空弧放电等离子体膨胀过程,还可以指导金属氘化物电极真空弧离子源及其引出设计.There are many kinds of ions in vacuum arc discharge plasma,which have different distributions in space.In this paper,a compact magnetic analyzer is developed for studying the spatial distribution of deuterium ions and metal ions in vacuum arc discharge with occluded deuterium electrode.When the arc current is about 100 A,the device can effectively transfer the ion beam with good secondary electron suppression,and can accurately obtain the ion current intensity.The spatial distribution of deuterium ions and titanium ions in the vacuum arc discharge with TiD electrode are measured by this device.The results show that both deuterium ions and Titanium ions are Gaussian distribution in the radial direction,but deuterium ions are evenly distributed,while titanium ions are relatively concentrated near the axis,resulting in the lowest proportion of deuterium ions near the axis.Along the axis,the number of all ions decreases as a natural exponential function,and the relative magnitudes are approximately equal,so the proportion of deuterium ions is almost constant.The results of this study not only help to understand the plasma expansion process of vacuum arc discharge,but also guide the design of vacuum arc ion source with occluded deuterium electrode and its ion extraction.

关 键 词：真空弧离子源 金属氘化物 磁质谱 离子空间分布 

分 类 号：O53[理学—等离子体物理]