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OT11· Integration of Lost Alpha-Particle Diagnostic Systems on ITER

M. Sasao, M. Isobe¹, M. Nishiura¹, B. J. Peterson¹, C. Walker², R. Barnsley², N. Kubo, H. Nishimura, T. Hirouchi, H. Utoh, K. Okada, M. Okamoto, K. Shinto, S. Kitajima, and S.V. Konovalov³

Tohoku University, 6-6 Aoba, Aramaki, Aoba, Sendai 980-8579, Japan
¹National Institute for Fusion Science (NIFS), 332-6 Oroshi, Toki, Gifu 509-5292, Japan
²ITER International Team, Max-Planck-Institut Plasmaphysik, 85748 Garching, Germany ³Institute of Nuclear Fusion of RRC "Kurchatov Institute", Moscow , Russia

Abstract: Time-resolved measurement of lost alpha particles on the first wall is demanded on ITER, because it is anticipated that various kinds of collective instability are driven by alpha particles. Moreover, localization of alpha-particle loss on the first wall is one of the problems for the safe operation of ITER. However, the severe thermal/radiation environment of measurement location and the difficulties on the access and installation, limit the application of conventional measurement tools.
The ITER integration are studied for some candidates of lost alpha-particle measurement, such as the camera imaging of scintillators on the first wall, a scintillator probe, a Faraday-cup, and an imaging bolometer. An orbit calculation of escaping alpha particles is inevitable, and the orbit characteristics are considered in the conceptual design of these systems.

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