title: Development of a strongly focusing high-intensity He(+) ion source for a confined alpha particle measurement at ITER.
abstract: A strongly focusing high-intensity He(+) ion source has been designed and constructed as a beam source for a high-energy He(0) beam probe system for diagnosis of fusion produced alpha particles in the thermonuclear fusion plasmas. The He(+) beam was extracted from the ion source at an acceleration voltage of 18-35 kV. Temperature distributions of the beam target were observed with an IR camera. The 1/e-holding beam profile half-width was about 15 mm at optimum perveance (Perv) of 0.03 (I(beam)=2.4 A). A beam current about 3 A was achieved at an acceleration voltage of 26.7 kV with an arc power of 10 kW (Perv=0.023).
authors.affiliation: School of Engineering, Tohoku University, Sendai, Japan. masashi.kisaki@ppl2.qse.tohoku.ac.jp
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authors.lastname: Kisaki
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authors.lastname: Shinto
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authors.lastname: Kobuchi
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authors.lastname: Okamoto
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authors.lastname: Tsumori
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authors.lastname: Nishiura
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authors.lastname: Kaneko
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authors.lastname: Matsuda
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authors.lastname: Sakakita
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authors.lastname: Kiyama
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authors.lastname: Hirano