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Plasma shape effects on the Alfvén eigenmode spectrum through Alfvén slow-magnetosonic wave coupling

G J Kramer, C Z Cheng2023年Plasma Physics and Controlled FusionIF 2.2出版社

The effect of the plasma shaping (triangularity and elongation) on the continuous spectrum, frequency gaps, and number of eigenmodes is studied. The plasma shaping affects the coupling between Alfvén and slow magnetosonic waves via the geodesic magnetic curvature and the plasma pressure. The Alfvén-slow coupling creates a large number of new gaps in the continuous spectrum below the Alfvén frequency where discrete modes can reside. In ideal magnetohydrodynamic simulations a large number (a few hundred or more) of potential eigenmodes are found. The number of eigenmodes is correlated with the maximum geodesic curvature and a minimum number of possible discrete eigenmodes is found at a negative triangularity of −0.3. It is hypothesized that these possible eigenmodes form a low amplitude and dense discrete spectrum, which can be studied experimentally.

日本語訳

プラズマ形状(三角形度と伸長度)が連続スペクトル、周波数ギャップ、および固有モード数に及ぼす影響を研究した。プラズマ形状は、測地線曲率とプラズマ圧力を介して、アルフヴェン波と低速磁気音波の結合に影響を与える。アルフヴェン‐低速結合は、アルフヴェン周波数以下の連続スペクトルに、離散モードが存在し得る多数の新しいギャップを生成する。理想磁気流体力学シミュレーションでは、多数(数百以上)の潜在的な固有モードが見出される。固有モード数は最大測地線曲率と相関があり、三角形度−0.3において可能な離散モード数の最小値が見出される。これらの可能なモードは、低振幅かつ密な離散スペクトルを形成し、実験的に研究可能であるという仮説を立てる。

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Alfvén waveAlfvén eigenmodeMagnetosonic waves
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