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Zeeman polarimetry measurement for edge current density determination using Li-beam probe on JT-60U

JT-60UにおけるLiビームプローブを用いた周辺電流分布測定用ゼーマン偏光計

神谷 健作; 藤田 隆明; 小島 有志; 久保 博孝

Kamiya, Kensaku; Fujita, Takaaki; Kojima, Atsushi; Kubo, Hirotaka

JT-60Uにおいて周辺電流分布計測のためのゼーマン偏光計を開発した。空間分解能は約1cmで、プラズマ周辺部を20チャンネルの視線を見込む。5mA程度のLiビームのプラズマ入射に成功するとともに、検出系の調整後、プラズマ計測を実施した。Hモードプラズマの周辺部圧力勾配に起因すると考えられる周辺電流の計測に成功した。

Zeeman polarimetry system has been developed for the edge current density measurement in the JT-60U tokamak. The diagnostic has 20-ch viewing chords covering the plasma peripheral region with a spatial resolution of 1cm. Li-beam injection with beam current of up to 5mA has been achieved. The edge current density profile with the local peak at $$r$$/$$a$$ 0.9 has been identified in the H-mode plasma, which is correlated with large pressure gradient in the pedestal region.

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パーセンタイル:34.47

分野:Instruments & Instrumentation

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