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Impact of divertor geometry on H-mode confinement in the JET metallic wall

E. Joffrin, P. Tamain, E. Belonohy, H. Bufferand, P. Buratti, C.D. Challis, E. Delabie, P. Drewelow, D. Dodt, L. Frassinetti2017年被引用 24Nuclear FusionIF 3出版社

Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.

日本語訳

ITER類似壁を用いた最近の実験により、ダイバータ打撃点位置の変化が全体のエネルギー閉じ込めの大きな変化と相関することが実証された。エネルギー閉じ込めへの影響は、ペデスタル閉じ込めとコアの規格化勾配の両方において観測可能である。コーナー配位では、コア密度勾配長とイオン圧力の増大が示され、より良好なイオン閉じ込めを示唆している。中性粒子再循環の研究によれば、主容器内の中性粒子圧力はエネルギー閉じ込めと逆相関を示し、ペデスタル全圧力と主容器内の中性粒子圧力との間に相関関係が確立され得る。電荷交換損失や運動量損失がこの効果を説明できるようには見えないが、プラズマ周辺部における端部電位の変化が関与している可能性がある。本研究は、ペデスタルおよびコア閉じ込めに対するスクレイプオフ層(SOL)条件の重要性を強調するものである。

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jet高精度(タイトル一致)iter中精度(概要文一致)

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