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ELM-free and inter-ELM divertor heat flux broadening induced by edge harmonics oscillation in NSTX

K.F. Gan, J.-W. Ahn, T.K. Gray, S.J. Zweben, E.D. Fredrickson, F. Scotti, R. Maingi, J.-K. Park, G.P. Canal, V.A. Soukhanovskii2017年被引用 5Nuclear FusionIF 3出版社

A new n  =  1 dominated edge harmonic oscillation (EHO) has been found in NSTX. The new EHO, rotating toroidally in the counter-current direction and the opposite direction of the neutral beam, was observed during certain inter-ELM and ELM-free periods of H-mode operation. This EHO is associated with a significant broadening of the integral heat flux width () by up to 150%, and a decrease in the divertor peak heat flux by  >60%. An EHO induced filament was also observed by the gas puff imaging diagnostic. The toroidal rotating filaments could change the edge magnetic topology resulting in toroidal rotating strike point splitting and heat flux broadening. Experimental result of the counter current rotation of strike points splitting is consistent with the counter-current EHO.

日本語訳

新しい n = 1 支配のエッジ高調波振動(EHO)がNSTXで発見された。この新しいEHOは、トロイダル方向に逆電流方向、かつ中性粒子ビームと反対方向に回転し、Hモード運転の特定のinter-ELM期間およびELMフリー期間中に観測された。このEHOは、積分熱流束幅()の最大150%までの有意な広がりと、ダイバータのピーク熱流束の>60%の減少を伴う。EHOによって誘起されたフィラメントも、ガスパフイメージング診断によって観測された。トロイダル方向に回転するフィラメントは、エッジ磁気トポロジーを変化させ、その結果、トロイダル方向に回転するストライク点の分裂と熱流束の広がりを引き起こす可能性がある。ストライク点分裂の逆電流方向回転という実験結果は、逆電流方向EHOと一致する。

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nstx-u高精度(タイトル一致)

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DivertorEdge localized modeNSTXEdge localized mode-free
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