Numerical analysis of the spatial nonuniformity in a Cs-seeded H - ion source
Numerical analysis of the spatial nonuniformity in a Cs-seeded H - ion source
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DOI：
10.1063/1.2172356
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发表时间：
2006-03
影响因子：
1.6
通讯作者：
N. Takado;J. Hanatani;T. Mizuno;K. Katoh;A. Hatayama;M. Hanada;T. Seki;T. Inoue
中科院分区：
文献类型：
--
作者：
N. Takado;J. Hanatani;T. Mizuno;K. Katoh;A. Hatayama;M. Hanada;T. Seki;T. Inoue
H−离子的产生和输运过程进行了数值模拟，以澄清H−束不均匀性的起源。采用蒙特卡罗方法的三维输运程序已被应用于大型“JAERI 10A负离子源”中Cs-籽晶条件下的H 0原子和H−离子，其中负离子主要由表面产生过程产生。结果表明，在电子温度较高的区域产生了大量的氢原子。这导致了H 0原子流到等离子体网格的空间不均匀性以及由此产生的H−离子表面产生。此外，大多数表面产生的H−离子即使通过高Te区域也被提取而不被破坏。这些结果表明H−离子的产生过程与H−离子束的空间不均匀性之间存在相关性。
The H− ion production and transport processes are numerically simulated to clarify the origin of H− beam nonuniformity. The three-dimensional transport code using the Monte Carlo method has been applied to H0 atoms and H− ions in the large “JAERI 10A negative ion source” under the Cs-seeded condition, in which negative ions are dominantly produced by the surface production process. The results show that a large fraction of hydrogen atoms is produced in the region with high electron temperature. This leads to a spatial nonuniformity of H0 atom flux to the plasma grid and the resultant H− ion surface production. In addition, most surface-produced H− ions are extracted even through the high Te region without destruction. These results indicate a correlation between the production process of the H− ion and the spatial nonuniformity of the H− ion beam.