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External RMP effect on locked-mode-like instability in helical plasmas

Y. Takemura, K.Y. Watanabe, S. Sakakibara, S. Ohdachi, Y. Narushima, K. Ida, M. Yoshinuma, LHD Experiment Group2021年被引用 3Nuclear FusionIF 3出版社

The slowing-down mechanism of the locked-mode-like instabilities with and without an island structure is investigated through the effects of an external RMP (resonant magnetic perturbation) on the instabilities. For both instabilities, the slowing-down duration decreases with the increase in the external RMP, and the RMP dependence is consistent with the braking model of the j × B force due to the interaction between the instabilities and the external RMP. Moreover, the relationship between the amplitude and the frequency of both locked-mode-like instabilities during the slowing down is consistent with the force balance model between the j × B force due to the external RMP and a viscous force. These results suggest that the slowing down of both locked-mode-like instabilities with finite external RMP occurs due to the j × B force driven by the external RMP.

日本語訳

ロックトモード様不安定性の減速機構が、外部RMP(共鳴磁場摂動)が不安定性に及ぼす効果を通じて、島構造の有無にかかわらず調査される。両方の不安定性について、減速時間は外部RMPの増加とともに減少し、そのRMP依存性は、不安定性と外部RMPとの相互作用によるj×B力の制動モデルと一致する。さらに、減速中の両方のロックトモード様不安定性の振幅と周波数の関係は、外部RMPによるj×B力と粘性力との間の力平衡モデルと一致する。これらの結果は、有限の外部RMPを伴う両方のロックトモード様不安定性の減速が、外部RMPによって駆動されるj×B力によって生じることを示唆している。

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Resonant magnetic perturbation
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