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X-point effect on edge stability

S Saarelma, O J Kwon, A Kirk, the MAST Team2011年Plasma Physics and Controlled FusionIF 2.2出版社

We study the effects of the X-point configuration on edge localized mode (ELM) triggering peeling and ballooning modes using fixed boundary equilibria and modifying the plasma shape to approach the limit of a true X-point. The current driven pure peeling modes are asymptotically stabilized by the X-point while the stabilizing effect on ballooning modes depends on the poloidal location of the X-point. The coupled peeling–ballooning modes experience the elimination of the peeling component as the X-point is introduced. This can significantly affect the edge stability diagrams used to analyse the ELM triggering mechanisms.

日本語訳

我々は、固定境界平衡を用いてプラズマ形状を真のX点に近づけるように修正し、X点配位がエッジ局在モード(ELM)トリガリングに関連するピーリング・バルーニングモードに及ぼす影響を研究する。電流駆動の純ピーリングモードはX点によって漸近的に安定化される一方、バルーニングモードに対する安定化効果はX点のポロイダル位置に依存する。結合したピーリング・バルーニングモードは、X点が導入されるとピーリング成分の消滅を経験する。これは、ELMトリガリング機構を解析するために用いられるエッジ安定性ダイアグラムに大きな影響を与え得る。

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