Study of plasma meniscus and beam halo in negative ion sources using three dimension in real space and three dimension in velocity space particle in cell model.
Study of plasma meniscus and beam halo in negative ion sources using three dimension in real space and three dimension in velocity space particle in cell model.
复制标题
利用细胞模型中的实空间三维和速度空间粒子三维研究负离子源中的等离子体弯月面和束晕。
DOI：
10.1063/1.4854976
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
A. Fukano
中科院分区：
文献类型：
--
作者：
S. Nishioka;K. Miyamoto;S. Okuda;I. Goto;A. Hatayama;A. Fukano
我们之前通过实空间二维和速度空间三维的粒子模拟（PIC）模型进行的研究表明，等离子体弯月面的曲率会导致负离子源中出现束流晕。从弯月面边缘提取的负离子由于静电透镜效应在引出器中过度聚焦，从而形成束流晕。本研究的目的是用全三维模型验证这一机制。结果表明，即使在三维模型中，上述机制本质上也没有改变，而束流晕的比例显著降低至6%。该数值与实验结果合理吻合。
Our previous study by two dimension in real space and three dimension in velocity space-particle in cell model shows that the curvature of the plasma meniscus causes the beam halo in the negative ion sources. The negative ions extracted from the periphery of the meniscus are over-focused in the extractor due to the electrostatic lens effect, and consequently become the beam halo. The purpose of this study is to verify this mechanism with the full 3D model. It is shown that the above mechanism is essentially unchanged even in the 3D model, while the fraction of the beam halo is significantly reduced to 6%. This value reasonably agrees with the experimental result.