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Direct evidence of E × B flow changes at the onset of resonant magnetic perturbation-driven edge-localized mode crash suppression

Jaehyun Lee, Y.M. Jeon, Y. In, G.Y. Park, G.S. Yun, W. Lee, M. Kim, J.H. Lee, W.H. Ko, H.K. Park2019年被引用 24Nuclear FusionIF 3出版社

The bifurcation of perpendicular mode velocity near the pedestal top () at the onset of RMP-driven edge-localized mode (ELM)-crash suppression has been directly measured by using an electron cyclotron emission imaging diagnostic on KSTAR. The ELM crashes are suppressed along with a sudden reduction of , which synchronizes with the transition into and out of the ELM-crash suppression. The change of flow appears mainly responsible for the change of , whose magnitude is the smallest near the normalized flux surface during the ELM-crash suppression. The plasma response to the RMP field was most enhanced in the vicinity of during the ELM-crash suppression and showed a hysteresis behavior with respect to resonant field strength. With these changes, a strong nonlinear coupling between turbulent eddies was observed in the ELM-crash suppression, which is an important feature of the ELM-crash suppression.

日本語訳

台座顶部付近における垂直モード速度の分岐(ペデスタル上部付近の垂直方向モード速度の分岐)は、RMP駆動型ELMクラッシュ抑制の開始時に、KSTAR上の電子サイクロトロン放射イメージング診断を用いて直接測定された。ELMクラッシュは、ELMクラッシュ抑制への遷移およびそこからの遷移と同期した急激な減少とともに抑制された。流れの変化が主に変化の原因であると思われ、その大きさはELMクラッシュ抑制中に正規化磁束面付近で最小となった。RMPに対するプラズマ応答は、ELMクラッシュ抑制中にその近傍で最も顕著であり、共鳴磁場強度に対してヒステリシス挙動を示した。これらの変化に伴い、ELMクラッシュ抑制中に乱流渦間の強い非線形結合が観察され、これはELMクラッシュ抑制の重要な特徴である。

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kstar中精度(概要文一致)

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Edge localized modeMagnetic perturbationResonant magnetic perturbation
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