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Author(s):
M. Sasao, A. Taniike, I. Nomura, M. Wada, H. Yamaoka and M. Sato
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Title:
Development of Diagnostic Beams for Alpha Particle Measurement on ITER
Date of publication:
Aug. 1995
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Key words:
alpha particle, diagnostic beam, neutral particle analyzer, ITER, He^0 beam, Li^0 beam, He^- ion source, Li^- ion source
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Abstract:
The feasibility of alpha particle measurement using a high energy diagnostic beam in combination with a neutral particle analyzer is examined for a burning plasma on ITER. In order to measure them in the energy range of 0.5 - 3.5 MeV, the required beam energy is around 1 MeV for a ^3He^0 beam and 3 MeV for a ^6Li^0 beam with the beam current density of around 1 mA/cm^2 for both cases. Among the various methods to produce such a high energy neutral beam, the acceleration of negative ions is most favorable. Recent results of relatively small-scale experiments on these negative ion sources show that the required current density is now realistic. Some technical problems how to scale-up the ion sources to be used on an ITER-size experiment are also studied on these experiments.
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