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Snowflake divertor experiments on TCV

F Piras, S Coda, B P Duval, B Labit, J Marki, S Yu Medvedev, J-M Moret, A Pitzschke, O Sauter, the TCV team2010年Plasma Physics and Controlled FusionIF 2.2出版社

An ELMy H-mode 'snowflake' (SF) divertor is established and studied for the first time in the TCV tokamak. The H-mode access and the edge localized mode (ELM) dynamics are compared with a conventional single-null diverted configuration. The SF configuration exhibits 15% higher confinement and 2–3 times lower ELM frequency. Ideal MHD stability analysis suggests enhanced stability of the SF H-mode pedestal to mid- to high-toroidal-mode-number modes. The capability of the SF to redistribute the edge power on the additional strike points has been confirmed experimentally.

日本語訳

ELMy Hモード「スノーフレーク」(SF)ダイバータがTCVトカマクにおいて初めて実現され、研究された。Hモードへの遷移とELM(周辺局在モード)ダイナミクスは、従来のシングルヌル配位と比較された。SF配位は、15%高い閉じ込めと2〜3倍低いELM周波数を示した。理想MHD安定性解析は、SF Hモードペデスタルの、中〜高トロイダルモード数に対する安定性の向上を示唆している。追加のストライク点への周辺パワーの再分配におけるSFの能力は、実験的に確認された。

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