(FT/P2-28) Development of an Energetic He0 Beam Injector for Fusion Application

M. Sasao1), T. Kobuchi1), N. Tanaka1), M. Kisaki1), M. Kikuchi1), T. Nagamura1), A. Okamoto1), S. Kitajima1), O. Kaneko2), M. Nishiura2), K. Tsumori2), M. Wada3), K. Shinto4), H. Sakakita5), S. Kiyama5), Y. Hirano5)
1) Tohoku University, Department of Quantum Science and Energy Engineering, Aramaki, Japan
2) National Institute for Fusion Science, Toki, Gifu, 509-5292 Japan
3) Doshisha University, Kyotanabe, Kyoto 610-0321 Japan
4) Japan Atomic Energy Agency, Rokkasho, Aomori, 039-3212 Japan
5) National Institute of Advanced Industrial Science & Technology, Tsukuba 305-8568, Japan

Abstract.  A full-size strongly focusing He+ ion source has been designed and constructed to develop a 10-100 mA He- beam source for measurement of the spatial and velocity distribution of alpha particles in ITER burning plasma. The beam current above 2 A was required to meet the measurement specification for confined alpha particles, and it was obtained with this source at beam energy of 20 keV, which is suitable for He- charge-exchange production. The 1/e-holding beam profile half-width at the beam waist was about 15 mm. An efficient conversion factor (>1%) from He+ to He- and focusing properties of the He- beam were confirmed using a test stand for He0 beam production.

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