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Influence of poloidal equilibrium rotation in MHD simulations of edge-localized modes

S Pamela, G Huysmans, S Benkadda2010年Plasma Physics and Controlled FusionIF 2.2出版社

In nonlinear MHD simulations of edge localized modes (ELMs) with the code JOREK, a strong m = n = 0 poloidal flow localized in the H-mode pedestal region shears density filaments off the separatrix. This flow is nonlinearly induced by the ballooning instability (Huysmans and Czarny 2007 Nucl. Fusion47 659, Huysmans et al2009 Plasma Phys. Control. Fusion51 124012). An approach of the reduced resistive MHD equations used in JOREK leads to an analytical interpretation of the equilibrium flow in both circular and X-point plasmas. Transitions between two different flow structures have been found. Similar transitions between equilibrium flow states had been predicted by Strauss (1995 Phys. Plasmas2 1229). Finally, results concerning the influence of the equilibrium flow on the linear and nonlinear stabilities of the ELM are presented. ELM-like multiple crashes were simulated.

日本語訳

非線形MHDシミュレーションにおいて、コードJOREKを用いたエッジ局在モード(ELM)の解析では、Hモードペデスタルに局在する強いm = n = 0ポロイダル流が、密度フィラメントをセパラトリックスからせん断する。この流れは、バルーニング不安定性によって非線形的に誘起される(Huysmans and Czarny 2007 Nucl. Fusion47 659, Huysmans et al2009 Plasma Phys. Control. Fusion51 12405)。JOREKで使用される簡約化抵抗性MHD方程式のアプローチは、円形およびX点プラズマの両方における平衡流の解析的解釈を導く。2つの異なる流れ構造間の遷移が発見された。同様の遷移は、平衡流の状態間でStrauss(1995 Phys. Plasmas2 1229)によって予測されていた。平衡流が線形および非線形のELM安定性に及ぼす影響が提示される。ELM様の多重クラッシュがシミュレーションされた。

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MagnetohydrodynamicsEdge localized mode
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