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Edge transport barrier formation in compact helical system

S Okamura, T Minami, T Oishi, C Suzuki, K Ida, M Isobe, Y Yoshimura, K Nagaoka, K Toi, A Fujisawa2004年Plasma Physics and Controlled FusionIF 2.2出版社

The edge transport barrier (ETB) for particle transport is formed in the neutral beam (NB) heated hydrogen discharges in compact helical system (CHS). The transition to the ETB formation and the back transition are controlled by the heating power. The existence of the heating power threshold is confirmed and it is roughly proportional to the density. The Hα emission signal shows a clear drop at the transition (the timescale of signal decrease is ∼1 ms for the high heating power case). The ETB formation continues for the full duration of NB injection (100 ms) with a moderate level of radiation power loss. Local density profile measurement shows increase of the edge density and the movement of the density gradient region towards the edge.

日本語訳

粒子輸送に対する周辺輸送障壁(ETB)は、コンパクトヘリカルシステム(CHS)における中性粒子ビーム(NB)加熱水素放電中に形成される。ETB形成への遷移およびその逆遷移は、加熱パワーによって制御される。加熱パワー閾値の存在が確認され、それは密度にほぼ比例する。Hα発光信号は、遷移時に明確な低下を示す(高加熱パワーの場合、信号減少の時間スケールは約1 msである)。ETB形成は、中程度の放射パワー損失を伴いながら、NB入射の全期間(100 ms)にわたって継続する。局所密度分布測定により、周辺密度の増加と、密度勾配領域の端に向かう移動が示される。

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Transport barrierEdge transportCompact Helical SystemHelical system
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