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Finite magnetic well effects on resistive and drift-resistive ballooning modes in a shaped tokamak

D. Brunetti, C.J. Ham, S. Saarelma, J.P. Graves, J.W. Connor, A. Kleiner2022年被引用 2Nuclear FusionIF 3出版社

The impact of plasma shaping through magnetic well modifications on the stability of resistive ballooning modes (RBMs) in tokamaks is analysed, also including finite diamagnetic flows. Various limiting cases of the dispersion relation, obtained by matching the ballooning equation across the ideal and resistive layers, are analysed. It is found that stability is generally improved by the combination of vertical elongation and positive triangularity, although, in some cases, the growth rate of the unstable mode can be enhanced by these effects. Usually, vertically elongated plasmas with no triangularity are prone to exhibit worse stability properties. A value for the critical β above which RBMs are driven unstable is identified, and a connection with type-III ELM activity is established.

日本語訳

磁気井戸変形によるプラズマ形状変更がトカマクにおける抵抗性バルーニングモード(RBM)の安定性に及ぼす影響を解析し、有限な diamagnetic 流も含めて考察する。理想層と抵抗層を跨いでバルーニング方程式を接続して得られる分散関係の様々な極限ケースを解析する。その結果、垂直伸長と正の三角形度の組み合わせにより安定性が一般に向上することが判明したが、場合によってはこれらの効果により不安定モードの成長率が増大することもある。通常、三角形度がゼロの垂直伸長プラズマは、より劣った安定性特性を示しやすい。RBM が不安定化する臨界 β 値を特定し、タイプIII ELM 活動との関連性を確立した。

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Ballooning mode
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