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Effect of hyper-resistivity on ballooning modes with resonant magnetic perturbations

S Y Chen, M L Mou, T Q Liu, Y M Zhang, L K Dong, H Fan, X Lu, C J Tang2024年Plasma Physics and Controlled FusionIF 2.2出版社

The impact of hyper-resistivity on non-ideal ballooning modes (BMs) is studied in the presence of resonant magnetic perturbation (RMP) through considering the hyper-resistivity, resistivity and diamagnetic effect in the BM model with an equilibrium distorted by RMP, which is stable for ideal BMs. Similar to the resistivity, the hyper-resistivity is also destabilizing for the BMs, but RMPs make the mode spectrum of the BMs destabilized by the hyper-resistivity move towards the low toroidal mode number side on the flux surface with a safety factor slightly larger than the RMP resonance safety factor, where the growth rates of the BMs destabilized by the resistivity decrease due to RMP. When both the hyper-resistivity and the resistivity are considered, there is a sort of competitive relationship between them in determining the properties of BMs. If either of the hyper-resistivity term and the resistivity term is much larger than the other one, the instability of BMs is mainly determined by the larger one, and the effect of the smaller one is masked. The destabilizing mechanisms of the hyper-resistivity and the resistivity on BMs are similar, namely, the diffusion and dissipation of current and magnetic field weaken the stabilizing effect of magnetic field line bending. The research results may be important for understanding the enhancement of plasma transport and the mechanism of small edge localized mode (ELM) during ELM control with RMP.

日本語訳

RMPの存在下で、RMPによって歪められ、理想BMに対して安定な平衡を有するBMモデルにおいて、ハイパー抵抗率、抵抗率、および反磁性効果を考慮することにより、ハイパー抵抗率が非理想バルーニングモード(BM)に及ぼす影響を研究した。抵抗率と同様に、ハイパー抵抗率もBMを不安定化させるが、RMPは、ハイパー抵抗率によって不安定化されたBMのモードスペクトルを、RMP共鳴安全係数よりもわずかに大きい安全係数を持つ磁束面上の低トロイダルモード数側へ移動させる。そこでは、抵抗率によって不安定化されたBMの成長率はRMPによって減少する。ハイパー抵抗率と抵抗率の両方を考慮する場合、BMの特性を決定する際に、それらの間には一種の競合関係がある。ハイパー抵抗率項と抵抗率項のいずれかが他方よりはるかに大きい場合、BMの不安定性は主に大きい方によって決定され、小さい方の効果は覆い隠される。BMに対するハイパー抵抗率と抵抗率の不安定化機構は類似しており、すなわち、電流と磁場の拡散および散逸が磁力線の曲げによる安定化効果を弱める。本研究結果は、RMPを用いたELM制御中のプラズマ輸送の増大と小規模エッジ局在モード(ELM)の機構の理解にとって重要である可能性がある。

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Magnetic perturbationResonant magnetic perturbationBallooning mode
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