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The roles of plasma rotation and toroidal field ripple on the H-mode pedestal structure in JT-60U

H Urano, K Kamiya, Y Koide, T Takizuka, N Oyama, Y Kamada, the JT-60 team2006年Plasma Physics and Controlled FusionIF 2.2出版社

By conducting power scan experiments in three cases of toroidal field ripple configurations (δr ≃ 0.4, 1.0 and 2.0%) with variation of the toroidal momentum source (co, balanced, counter) relative to the direction of the plasma current, the roles of the loss of fast ions and toroidal rotation on the H-mode pedestal structure were investigated. It was found that the pedestal pressure was increased with a decrease in fast ion loss power. On the other hand, the variation in toroidal rotation did not affect strongly the pedestal pressure, although the loss of fast ions due to existing large toroidal field ripple forced the toroidal rotation basically to the counter direction in JT-60U. Due to the enhanced counter toroidal rotation induced by the loss of fast ions, similar Vtor profiles were obtained for discharges with different toroidal momentum source and loss of fast ions. When the loss of fast ions became smaller, pedestal density was raised remarkably while there was no significant difference in the temperature profiles.

日本語訳

トロイダル磁場リップルの3つの場合(δr ≃ 0.4、1.0、2.0%)におけるパワースキャン実験を実施し、プラズマ電流の方向に対するトロイダル運動量源(co、balanced、counter)を変化させることにより、Hモードペデスタル構造における高速イオン損失とトロイダル回転の役割を調査した。ペデスタル圧力は高速イオン損失パワーの減少に伴って増加することが見出された。一方、トロイダル回転の変化はペデスタル圧力に強く影響しなかった。ただし、JT-60Uにおける既存の大きなトロイダル磁場リップルによる高速イオン損失は、トロイダル回転を基本的にcounter方向に駆動した。高速イオン損失によって誘起されたcounterトロイダル回転の増強により、トロイダル運動量源と高速イオン損失が異なる放電においても、類似したVtorプロファイルが得られた。高速イオン損失が小さくなると、温度プロファイルに有意な差は見られないものの、ペデスタル密度は顕著に増加した。

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H-modePedestalJT-60UPlasma rotationH-mode pedestalField ripple
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