Numerical analysis of negative ion temperature in a negative ion source
Numerical analysis of negative ion temperature in a negative ion source
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负离子源中负离子温度的数值分析
DOI：
10.1063/1.1695606
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发表时间：
2004
影响因子：
1.6
通讯作者：
M. Bacal
中科院分区：
文献类型：
--
作者：
A. Hatayama;K. Makino;T. Sakurabayasi;K. Miyamoto;M. Ogasawara;M. Bacal
为了了解在多尖点、混合型 H− 离子源（Camembert III）中观察到的体积产生的 H− 离子的两个能量组的起源，通过三维蒙特卡罗模拟代码进行了数值分析。模型中考虑了真实的多尖点几何形状和灯丝附近的电场。库仑碰撞引起的能量弛豫过程也通过蒙特卡罗方法包含在模型中。在卡门贝尔 III 的典型低压条件下，在中心区域可以清楚地观察到高能 H− 离子。这些高能 H− 离子的起源可能是通过 (1) 灯丝附近电场加速和 (2) 这些高能 H− 离子相对较长的能量损失时间的综合效应来解释的。然而，在模拟中并没有清楚地观察到低能团。具有原始能量 (∼0.05 eV) 的低能 H− 离子有足够的时间将其能量释放到背景 H+ 离子的相对较高温度，...
To understand the origin of the two energy groups of volume produced H− ions observed in the multicusp, hybrid-type H− ion source (Camembert III), numerical analysis by the three-dimensional Monte Carlo simulation code has been done. Realistic multicusp geometry and the electric field near the filament are taken into account in the model. The energy relaxation process by Coulomb collision is also included in the model by the Monte Carlo method. Under the typical low-pressure condition of Camembert III, high-energy H− ions are clearly observed in the central region. The origin of these high-energy H− ions is possibly explained by the combined effects of (1) acceleration by electric field near the filament and (2) relatively large energy-loss time of these high-energy H− ions. However, the low energy group is not clearly observed in the simulation. The low energy H− ions with original energy (∼0.05 eV) have enough time to relax their energy towards the relatively high temperature of the background H+ ions, ...