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Evolution of the pedestal on MAST and the implications for ELM power loadings

A Kirk, G F Counsell, G Cunningham, J Dowling, M Dunstan, H Meyer, M Price, S Saarelma, R Scannell, M Walsh2007年Plasma Physics and Controlled FusionIF 2.2出版社

Studies of the pedestal characteristics and quantities determining edge-localized mode (ELM) energy losses in MAST are presented. High temperature pedestal plasmas have been achieved which have collisionalities one order of magnitude lower than previous results . A stability analysis performed on these plasmas shows them to be near the ballooning limit. The fraction of pedestal energy released by an ELM as a function of collisionality on MAST is consistent with data from other devices. The evolution of the filamentary structures observed during ELMs has been studied and has shown that they exist near to the last closed flux surface for the time over which the majority of particles and energy are being released from the pedestal region into the scrape off layer. A simple model has been developed, which is in reasonable agreement with the observed ELM energy losses and target profiles.

日本語訳

MASTにおけるペデスタル特性と、エッジ局在モード(ELM)エネルギー損失を決定する量の研究を提示する。従来の結果よりも衝突度が一桁低い高温ペデスタルプラズマが達成された。これらのプラズマに対して実施された安定性解析は、それらがバルーニング限界付近にあることを示している。MASTにおける衝突度の関数としてのELMによるペデスタルエネルギー損失割合は、他の装置のデータと一致している。ELM中に観測されるフィラメント構造の時間発展は、粒子とエネルギーの大部分がペデスタル領域からスクレイプオフ層へ放出される期間中、それらが最終閉鎖磁気面の近傍に存在することを示している。観測されたELMエネルギー損失およびターゲットプロファイルと合理的に一致する単純なモデルが開発された。

装置

mast高精度(タイトル一致)

wiki

Edge localized modePedestalMAST
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