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Impact of ion diamagnetic drift on MHD stability at edge pedestal in JT-60U rotating plasmas

N. Aiba, M. Honda, K. Kamiya2017年被引用 15Nuclear FusionIF 3出版社

The effect of ion diamagnetic drift on the stability of peeling–ballooning modes in rotating tokamak plasmas has been analyzed numerically. The results show that plasma toroidal rotation can not only destabilize the peeling–ballooning mode but also can reduce the ion diamagnetic drift effect on the mode stability, even though the ion diamagnetic drift effect stabilizes the mode in a static plasma. Plasma poloidal rotation can also destabilize the mode and cancel the ion diamagnetic drift effect, even when the rotation frequency is much smaller than the toroidal one. These impacts of the rotation on the stability can resolve the discrepancy between the result of the numerical stability analysis and the experimental result in type-I ELMy H-mode plasmas in JT-60U. The reduction of the ion diamagnetic drift effect on ELM stability due to plasma rotation is shown to depend on the direction of the rotation, so that the ion diamagnetic drift effect becomes negligible only when the JT-60U plasma rotates in the direction counter to the plasma current.

日本語訳

イオン反磁性ドリフトが回転トカマクプラズマにおけるペデスタル・モード(peeling–ballooningモード)の安定性に及ぼす影響を数値的に解析した。その結果、プラズマのトロイダル回転はペデスタル・モードを不安定化させるだけでなく、静止プラズマにおいてモードを安定化させるイオン反磁性ドリフト効果を低減させることが示された。また、プラズマのポロイダル回転も、その回転周波数がトロイダル回転のそれよりもはるかに小さい場合であっても、モードを不安定化させ、イオン反磁性ドリフト効果を打ち消すことができる。これらの回転が安定性に及ぼす影響は、JT-60UにおけるタイプI ELM Hモードプラズマの数値安定性解析の結果と実験結果との間の不一致を解決し得る。イオン反磁性ドリフト効果の低減は回転の方向に依存し、その効果が無視できるようになるのは、JT-60Uプラズマがプラズマ電流と逆方向に回転する場合のみであることが示された。

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MagnetohydrodynamicsPedestalJT-60UMHD stabilityRotating plasma
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