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

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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


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