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Effect of plasma shape variation on ELMs and H-modepedestal properties in ASDEX Upgrade

W Suttrop, O Gruber, B Kurzan, H D Murmann, J Neuhauser, J Schweinzer, J Stober, W Treutterer, the ASDEX Upgrade Team2000年Plasma Physics and Controlled FusionIF 2.2出版社

The effect of plasma shape variation (in particular, variation ofthe upper and lower triangularity δ) on edge localizedmodes (ELMs) and H-mode pedestal properties in ASDEX Upgrade isreported here. Strongly shaped plasmas (high δ) show anincreased edge pressure gradient and, without external gaspuff, type-I ELMs generally have larger losses and lowerfrequency than in plasmas with low δ. With external gaspuff, ELM losses at high δ are reduced and in the samerange as found for low δ. The average ELM power loss is aconstant fraction of the total loss power, independent oftriangularity. The width of the steep electron temperature andpressure gradient zone remains essentially constant at lowδ while at high δ it shows a variationinconsistent with a poloidal gyroradius scaling. The edgepressure gradient and the pedestal pressure scales strongly withplasma current and triangularity. In type-I ELM H-modes, thepedestal pressure is directly related to the global storedplasma energy, independent of plasma shape.

日本語訳

本稿では、ASDEX Upgradeにおけるプラズマ形状の変化(特に上部・下部三角形度δの変化)が、周辺局在モード(ELM)およびHモード・ペデスタル特性に及ぼす影響について報告する。強く成形されたプラズマ(高δ)では、エッジ圧力勾配が増大し、外部ガス入射がない場合、タイプI ELMは一般に低δプラズマよりも大きな損失と低い周波数を示す。外部ガス入射がある場合、高δでのELM損失は低減され、低δで見られる範囲と同程度になる。平均ELMパワー損失は全損失パワーの一定割合であり、三角形度に依存しない。急峻な電子温度・圧力勾配領域の幅は、低δでは本質的に一定に保たれるが、高δではポロイダルジャイロ半径スケーリングと一致しない変化を示す。エッジ圧力勾配およびペデスタル圧力は、プラズマ電流と三角形度に強く依存してスケーリングする。タイプI ELM Hモードにおいて、ペデスタル圧力はプラズマ形状に依存せず、全体的な蓄積プラズマエネルギーに直接関連する。

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asdex-upgrade高精度(タイトル一致)

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ASDEXEdge localized modeASDEX Upgrade
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