Numerical analysis of the spatial nonuniformity in a Cs-seeded H - ion source

N. Takado, J. Hanatani, T. Mizuno, K. Katoh, A. Hatayama, M. Hanada, T. Seki, T. Inoue

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Abstract

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.

Original languageEnglish
Article number03A533
JournalReview of Scientific Instruments
Volume77
Issue number3
DOIs
Publication statusPublished - 2006 Mar 1

ASJC Scopus subject areas

  • Instrumentation

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    Takado, N., Hanatani, J., Mizuno, T., Katoh, K., Hatayama, A., Hanada, M., Seki, T., & Inoue, T. (2006). Numerical analysis of the spatial nonuniformity in a Cs-seeded H - ion source. Review of Scientific Instruments, 77(3), [03A533]. https://doi.org/10.1063/1.2172356