Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source

T. Kobuchi; M. Kisaki; K. Shinto; A. Okamoto; S. Kitajima; M. Sasao; K. Tsumori; O. Kaneko; H. Sakakita; S. Kiyama; Y. Hirano; M. Wada

doi:10.1063/1.2965781

Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source

T. Kobuchi, M. Kisaki, K. Shinto, A. Okamoto, S. Kitajima, M. Sasao, K. Tsumori, O. Kaneko, H. Sakakita, S. Kiyama, Y. Hirano, M. Wada

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

2 Citations (Scopus)

Abstract

A strongly focusing high-intensity He+ ion source equipped with three concave electrodes has been designed and constructed as the beam source for a high-energy He0 neutral beam probe system to diagnose fusion-produced alpha particles in thermonuclear fusion plasmas. The reduction of heat load onto the concave extraction electrodes is particularly important for a long pulse operation, as the heat load deforms the electrodes and thus the beam focal length. The effects on the arc efficiency (beam current/arc power) of the ion source due to the discharge filament structure (straight-type and L-shape-type filaments), size (filament diameters of 2 and 1.5 mm), number, and the locations have been studied. Choice of the appropriate filament structure improved the arc efficiency by 17%.

Original language	English
Article number	10F316
Journal	Review of Scientific Instruments
Volume	79
Issue number	10
DOIs	https://doi.org/10.1063/1.2965781
Publication status	Published - 2008
Externally published	Yes

ASJC Scopus subject areas

Instrumentation

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10.1063/1.2965781

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@article{aa880e0bcc3f43fcafd7867feb63c800,

title = "Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source",

abstract = "A strongly focusing high-intensity He+ ion source equipped with three concave electrodes has been designed and constructed as the beam source for a high-energy He0 neutral beam probe system to diagnose fusion-produced alpha particles in thermonuclear fusion plasmas. The reduction of heat load onto the concave extraction electrodes is particularly important for a long pulse operation, as the heat load deforms the electrodes and thus the beam focal length. The effects on the arc efficiency (beam current/arc power) of the ion source due to the discharge filament structure (straight-type and L-shape-type filaments), size (filament diameters of 2 and 1.5 mm), number, and the locations have been studied. Choice of the appropriate filament structure improved the arc efficiency by 17%.",

author = "T. Kobuchi and M. Kisaki and K. Shinto and A. Okamoto and S. Kitajima and M. Sasao and K. Tsumori and O. Kaneko and H. Sakakita and S. Kiyama and Y. Hirano and M. Wada",

note = "Funding Information: The authors would like to thank Mr. E. Asano, Mr. H. Hayashi, and the members of NBI-Group at NIFS for their technical support in the experiment. This work was supported by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Sciences and Technology of Japan, Priority Area No. 442-16082101. This work was also partially supported by NIFS collaboration programs (NIFS07KCBB007).",

year = "2008",

doi = "10.1063/1.2965781",

language = "English",

volume = "79",

journal = "Review of Scientific Instruments",

issn = "0034-6748",

publisher = "American Institute of Physics Publising LLC",

number = "10",

}

TY - JOUR

T1 - Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source

AU - Kobuchi, T.

AU - Kisaki, M.

AU - Shinto, K.

AU - Okamoto, A.

AU - Kitajima, S.

AU - Sasao, M.

AU - Tsumori, K.

AU - Kaneko, O.

AU - Sakakita, H.

AU - Kiyama, S.

AU - Hirano, Y.

AU - Wada, M.

N1 - Funding Information: The authors would like to thank Mr. E. Asano, Mr. H. Hayashi, and the members of NBI-Group at NIFS for their technical support in the experiment. This work was supported by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Sciences and Technology of Japan, Priority Area No. 442-16082101. This work was also partially supported by NIFS collaboration programs (NIFS07KCBB007).

PY - 2008

Y1 - 2008

N2 - A strongly focusing high-intensity He+ ion source equipped with three concave electrodes has been designed and constructed as the beam source for a high-energy He0 neutral beam probe system to diagnose fusion-produced alpha particles in thermonuclear fusion plasmas. The reduction of heat load onto the concave extraction electrodes is particularly important for a long pulse operation, as the heat load deforms the electrodes and thus the beam focal length. The effects on the arc efficiency (beam current/arc power) of the ion source due to the discharge filament structure (straight-type and L-shape-type filaments), size (filament diameters of 2 and 1.5 mm), number, and the locations have been studied. Choice of the appropriate filament structure improved the arc efficiency by 17%.

AB - A strongly focusing high-intensity He+ ion source equipped with three concave electrodes has been designed and constructed as the beam source for a high-energy He0 neutral beam probe system to diagnose fusion-produced alpha particles in thermonuclear fusion plasmas. The reduction of heat load onto the concave extraction electrodes is particularly important for a long pulse operation, as the heat load deforms the electrodes and thus the beam focal length. The effects on the arc efficiency (beam current/arc power) of the ion source due to the discharge filament structure (straight-type and L-shape-type filaments), size (filament diameters of 2 and 1.5 mm), number, and the locations have been studied. Choice of the appropriate filament structure improved the arc efficiency by 17%.

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DO - 10.1063/1.2965781

M3 - Article

C2 - 19044629

AN - SCOPUS:55349143233

SN - 0034-6748

VL - 79

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10

M1 - 10F316

ER -

Effects of filament geometry on the arc efficiency of a high-intensity He+ ion source

Abstract

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