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P21 · Conceptual Design of Confined Alpha Particle Diagnostic System for ITER Using an Energetic He⁰ Beam

K. Shinto, M. Sasao, M. Isobe¹, M. Nishiura¹, O. Kaneko¹, M. Wada², C. I. Walker³, H. Haskell³, S. Kitajima, A. Okamoto, H. Sugawara, S. Takeuchi, N. Tanaka, H. Aoyama and M. Kisaki

Tohoku University, Aoba, Sendai 980-8579, Japan
¹National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
²Doshisha University, Kyotanabe, Kyoto 610-0321, Japan CMax-Planck-Institut für Plasmaphysik, Garching, Germany

Abstract: A conceptual design of an active-neutral-beam-probe-diagnostic-system for alpha particles produced by D-T nuclear reaction in a plasma confined by a magnetic fusion reactor has been examined. An energetic He⁰ beam plays an important role in the system. To detect a signal of neutralized alpha particles from the fusion plasma with enough S/N ratios, a high brightness He⁰ beam produced by spontaneous electron detachment from He^- ions is required. A prototype of a He⁺ ion source has been designed and assembled to test the performance in producing a source beam for high intensity He^- beam through a double-charge-exchange process in alkali metal vapor.

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