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Characterization of peeling–ballooning stability limits on the pedestal

P B Snyder, H R Wilson, T H Osborne, A W Leonard2004年Plasma Physics and Controlled FusionIF 2.2出版社

The peeling–ballooning model for edge localized modes (ELMs) and pedestal constraints, based on ideal MHD instabilities driven by pressure gradients and current in the edge barrier region, has been broadly applied toward understanding ELM and pedestal behaviour in a number of tokamak experiments. Due in part to multiple driving terms, multiple wavelengths and second stability access physics, the peeling–ballooning stability limits which are proposed to constrain the pedestal and trigger ELMs depend sensitively on many details of the tokamak equilibrium. Here we present a technique for characterizing these stability constraints as a function of important parameters, using carefully constructed model equilibria. We discuss comparisons of calculated stability constraints to observed pedestal behaviour, in which an encouraging level of agreement is found. We then present results of an extensive series of calculations which characterize the peeling–ballooning stability constraints as a function of pedestal width, magnetic field, plasma current, density, and triangularity.

日本語訳

ペデスタル領域における圧力勾配と電流によって駆動される理想MHD不安定性に基づく、エッジ局在モード(ELM)とペデスタル制約のためのピーリング・バルーニングモデルは、多くのトカマク実験におけるELMおよびペデスタル挙動の理解に広く適用されてきた。複数の駆動項、複数の波長、および第二安定領域へのアクセスに一部起因して、ペデスタルを制約しELMを引き起こすと提案されているピーリング・バルーニング安定性限界は、トカマク平衡の多くの詳細に敏感に依存する。本論文では、注意深く構築されたモデル平衡を用いて、これらの安定性制約を重要なパラメータの関数として特徴付ける手法を提示する。計算された安定性制約と観測されたペデスタル挙動との比較について議論し、そこでは有望なレベルの一致が見出される。続いて、ペデスタル幅、磁場、プラズマ電流、密度、および三角形度の関数としてピーリング・バルーニング安定性制約を特徴付ける一連の広範な計算結果を提示する。

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