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H-mode pedestal structure in the variation of toroidal rotation and toroidal field ripple in JT-60U

H. Urano, N. Oyama, K. Kamiya, Y. Koide, H. Takenaga, T. Takizuka, M. Yoshida, Y. Kamada, the JT-60 Team2007年被引用 50Nuclear FusionIF 3出版社

The effects of toroidal rotation and toroidal field (TF) ripple on the edge pedestal structure and edge-localized-modes (ELMs) were examined in JT-60U. The amplitude of the TF ripple was changed by the installation of ferritic steel tiles (FSTs). The profile of toroidal rotation VT became less counter with FSTs, particularly in the case where co-NBI was used in a large volume configuration. In this case, the plasma pressure was raised across the whole profile of the plasma. At the plasma edge, higher pedestal temperature was obtained with the growth of pedestal width. However, the effect of FSTs became less significant in a small volume configuration. As the VT became less counter at the pedestal, ELM frequency fELM was reduced and ELM energy loss ΔWELM was increased at fixed power crossing the separatrix Psep. The observed larger ELM energy drop at VT in a relatively co-direction involves the ELM perturbations of the electron temperature profile across an ELM that extends radially more inward. In addition, the inter-ELM transport loss is reduced and the pedestal pressure pped is weakly raised. The effect of FSTs appeared clearly in the large volume configuration where pped is raised even at a given VT at the pedestal while pped is not changed by FSTs at the small volume configuration. This suggests that the reduction of the TF ripple, the magnitude of which can affect the VT profile, plays a role in the increasing of pped. For increased pped due to the use of co-NBI and the reduction of TF ripple, the spatial width of the pedestal ion temperature became greater.

日本語訳

トロイダル回転とトロイダル磁場(TF)リップルが周辺ペデスタル構造および周辺局在モード(ELM)に及ぼす効果をJT-60Uにおいて調べた。TFリップルの振幅は、フェライト鋼タイル(FST)の設置によって変更された。トロイダル回転VTの分布は、FSTにより反対方向(counter)側への大きさが減少した。特に、大容積配位でco-NBIを用いた場合に顕著であった。この場合、プラズマ圧力はプラズマの全分布にわたって上昇した。プラズマ周辺部では、ペデスタル幅の成長に伴い、より高いペデスタル温度が得られた。しかし、FSTの効果は小容積配位ではあまり顕著ではなかった。ペデスタルにおいてVTがcounter方向に小さくなるにつれて、ELM周波数fELMは減少し、ELMエネルギー損失ΔWELMは、セパラトリックスを横切る固定パワーPsepにおいて増加した。比較的co方向のVTで観測されたより大きなELMエネルギー損失は、ELM中の電子温度分布の摂動がより内側に半径方向に広がることを伴う。さらに、ELM間の輸送損失は減少し、ペデスタル圧力ppedはわずかに上昇する。FSTの効果は、大容積配位で明確に現れ、そこではペデスタルにおけるVTが与えられた場合でもppedが上昇する一方、小容積配位ではppedはFSTによって変化しない。これは、VT分布に影響を与え得る大きさのTFリップルの低減が、ppedの増加に役割を果たすことを示唆している。co-NBIの使用とTFリップルの低減によるppedの増加に対して、ペデスタルイオン温度の空間幅はより大きくなった。

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H-modePedestalJT-60UToroidal rotationH-mode pedestalField ripple
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