Influence of H- velocity on H- extraction probability from a negative ion source.
Influence of H- velocity on H- extraction probability from a negative ion source.
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H 速度对从负离子源提取 H 的概率的影响。
DOI：
10.1063/1.3271436
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Wada
中科院分区：
文献类型：
--
作者：
Y. Matsumoto;M. Nishiura;K. Shinto;H. Yamaoka;M. Sasao;M. Wada
我们通过三维蒙特卡罗计算研究了H(-)初始传输方向和动能对H(-)提取概率的影响。结果，较低能量的H(-)离子被电势结构强烈捕获，使得H(-)传输方向的初始条件被电场的排列所抵消；因此，它对H(-)提取概率的影响较小。此外，束流提取电压引起的电势山更有效地提高了较低能量H(-)离子的H(-)提取概率。提取区域附近的局部等离子体电势大小与该区域中 H(-) 离子的平均速度之间的相关性应确定从离子源中提取 H(-) 的概率。
We investigate influence of H(-) initial transport direction and kinetic energy on H(-) extraction probability with three-dimensional Monte Carlo calculation. As a result, lower energy H(-) ions are strongly trapped by the electrical potential structure, so that initial condition of H(-) transport direction is cancelled by alignment of the electric field; thus, it has lower influence for H(-) extraction probability. Besides, the potential hill induced by the beam extraction voltage more effectively enhances H(-) extraction probability for the lower energy H(-) ions. The correlation between the magnitude of the local plasma potential near the extraction region and the mean velocity of H(-) ions in the region should determine the H(-) extraction probability from the ion source.