Beam extraction from a large vacuum-immersed negative-ion source

Y. Takeiri, Y. Oka, O. Kaneko, A. Ando, K. Tsumori, R. Akiyama, T. Kawamoto, T. Kuroda

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A large vacuum-immersed negative-ion source has been investigated for the development of the neutral beam injection system in a large helical device. The structure of the vacuum-immersed source is compact and light because it is free from atmospheric pressure. Therefore, this is very advantageous for a large-scaled ion source. Moreover, since the grids of the accelerator are supported by post insulators, enhanced pumping of gaps between grids is expected, leading to a reduction of stripping loss of negative ions. The gas pressure distribution between grids was calculated and the stripping loss of H- ions was estimated and the effectiveness of the vacuum-immersed source structure was confirmed. The gas temperature effect of the gas pressure distribution is also considered by using a Monte Carlo code.

Original languageEnglish
Pages (from-to)1198-1200
Number of pages3
JournalReview of Scientific Instruments
Issue number4
Publication statusPublished - 1994 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation

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  • Cite this

    Takeiri, Y., Oka, Y., Kaneko, O., Ando, A., Tsumori, K., Akiyama, R., Kawamoto, T., & Kuroda, T. (1994). Beam extraction from a large vacuum-immersed negative-ion source. Review of Scientific Instruments, 65(4), 1198-1200.