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

doi:10.1063/1.1145056

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

ENG - Electrical Engineering

National Institutes of Natural Sciences - National Institute for Fusion Science

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	1198-1200
Number of pages	3
Journal	Review of Scientific Instruments
Volume	65
Issue number	4
DOIs	https://doi.org/10.1063/1.1145056
Publication status	Published - 1994

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abstract = "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.",

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T1 - Beam extraction from a large vacuum-immersed negative-ion source

AU - Takeiri, Y.

AU - Oka, Y.

AU - Kaneko, O.

AU - Ando, A.

AU - Tsumori, K.

AU - Akiyama, R.

AU - Kawamoto, T.

AU - Kuroda, T.

PY - 1994

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N2 - 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.

AB - 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.

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

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