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Edge stability analysis of high βp plasmas

S Saarelma, S Günter2004年Plasma Physics and Controlled FusionIF 2.2出版社

An MHD stability analysis of the edge plasma shows that in highly triangular plasmas, the increasing global βp has a stabilizing effect on the low-n instabilities that trigger edge localized modes (ELMs). The improved stability allows the access of higher edge pressure gradients before the ELM is triggered. At the same time, the edge plasma moves closer to the high-n ballooning mode stability boundary. The stability changes can explain why the high value of βp helps to access smaller ELMs.

日本語訳

周辺プラズマのMHD安定性解析により、高三角形度プラズマにおいて、グローバルβpの増加がエッジ局在モード(ELM)を誘発する低n不安定性に対して安定化効果を持つことが示される。この安定性の向上により、ELMが誘発される前に、より高い周辺圧力勾配へのアクセスが可能となる。同時に、周辺プラズマは高nバルーニングモードの安定性境界に近づく。これらの安定性の変化は、高いβpの値がより小さなELMへのアクセスを助ける理由を説明することができる。

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