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

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2 Citations (Scopus)


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 languageEnglish
Article number10F316
JournalReview of Scientific Instruments
Issue number10
Publication statusPublished - 2008
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation


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