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Characterization of Type-I ELMs in tangential co-, balanced- and counter- plus perpendicular NBI heated plasmas on JT-60U

K Kamiya, H Urano, Y Koide, T Takizuka, N Oyama, Y Kamada, the JT-60 Team2006年Plasma Physics and Controlled FusionIF 2.2出版社

Effects of plasma rotation and losses of fast ions on Type-I ELM characteristics have been systematically studied in the JT-60U tokamak, scanning combinations of NBI (tangential co-, balanced- and counter-NBI plus perpendicular NBI) in the three types of plasma configurations (corresponding toroidal field ripple at the plasma edge, δr ∼ 0.4, 1.0 and 2.0%). New findings on the Type-I ELM characteristics are as follows: smaller ELM energy loss normalized by pedestal stored energy, ΔWELM/Wped, and faster ELM frequency, fELM, are confirmed in the counter-NBI in comparison with the co-NBI discharges. Nevertheless, the power loss due to ELM, PELM (= ΔWELM × fELM), normalized by heating power crossing the separatrix, PSEP, is constant regardless of the direction of the momentum injection at each plasma configuration. In contrast, the PELM/PSEP decreases with increasing δr. The relationship between ELMs, rotation and the losses of fast ions are discussed.

日本語訳

プラズマ回転と高速イオンの損失がType-I ELM特性に及ぼす影響について、JT-60Uトカマクにおいて、3種類のプラズマ配位(対応するプラズマ周辺部のトロイダル磁場リップルδr ∼ 0.4、1.0、2.0)でNBI(接線方向共回転、バランス、接線方向逆回転に加え、垂直方向NBI)の組み合わせを走査することにより、系統的に研究した。Type-I ELM特性に関する新たな知見は以下の通りである。ペデスタル蓄積エネルギーで規格化したELMエネルギー損失ΔWELM/Wpedは小さく、ELM周波数fELMは速いことが、共回転NBI放電と比較して逆回転NBI放電において確認された。それにもかかわらず、ELMによる電力損失PELM(= ΔWELM × fELM)をセパラトリックスを横切る加熱電力PSEPで規格化した値PELM/PSEPは、各プラズマ配位において運動量入射方向に依存せず一定であった。対照的に、PELM/PSEPはδrの増加とともに増加した。ELM、回転、および高速イオンの損失の間の関係について議論する。

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Edge localized modeNeutral beam injectionJT-60U
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