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Turbulence, flows and edge localized mode (ELM) dynamics in limiter H-mode plasmas in TEXTOR

S Soldatov, A Krämer-Flecken, M Kantor, B Unterberg, Y Sun, G Van Oost, D Reiter, the TEXTOR team2010年Plasma Physics and Controlled FusionIF 2.2出版社

The turbulence, plasma flow and edge localized mode (ELM) dynamics in the limiter H-mode TEXTOR plasmas are investigated. Properties of both ambient turbulence within 0 < k⊥ < 4.2 cm−1 and coherent modes are studied on the ELM time scale in detail. The turbulence level near the pedestal is shown to evolve several times with the period of ELMs. Within the inter-ELM period the 'silent stage' is found which is characterized by an extremely low (below that for Ohmic plasmas) turbulence level and a phase growth in the reflectometry signal. The silent stage is associated with the quasi-steady state when the pedestal is formed and confinement is improved between two successive ELMs. Quasi-coherent density oscillations near the pedestal region with m ≈ 3, 5, 16 and 38 are measured with correlation reflectometry. Low-m modes are found to reveal the signatures of precursor mode. At first, the radial structure of the rotation shear and radial electric field Er in limiter H-mode in TEXTOR is presented. The characteristic negative electric field well with the sharp gradient ∇Er ≈ 250 V cm−2 at ≈2 cm inside separatrix is resolved. The Er × B rotation profile defines both the resulting plasma rotation in the electron diamagnetic drift direction and a significant rotation shear near the separatrix which exceeds the decorrelation rate of ambient turbulence by several times.

日本語訳

TEXTORリミターHモードプラズマにおける乱流、プラズマ流、および周辺局在モード(ELM)ダイナミクスを調査した。0 < k⊥ < 4.2 cm⁻¹の範囲の周辺乱流の特性とコヒーレントモードの両方を、ELM時間スケールで詳細に研究した。ペデスタル近傍の乱流レベルは、ELMの周期に伴って数回変動することが示された。ELM間期には「静穏期」が観測され、これはオーミックプラズマの乱流レベルを下回る極めて低い乱流レベルと、反射測定信号の位相成長によって特徴づけられる。この静穏期は、ペデスタルが形成され、2つの連続するELM間で閉じ込めが改善される準定常状態に対応する。ペデスタル近傍の準コヒーレント密度振動は、m ≈ 3、5、16、38のポロイダルモード数で反射測定により測定された。低次のmモードは前駆モードの特徴を示すことが明らかになった。まず、TEXTORリミターHモードにおける回転シアと径電場Erの径方向構造を示す。セパラトリクス内側約2 cmの位置に、∇Er ≈ 250 V cm⁻²の急峻な勾配を伴う特徴的な負の電場井戸が分解された。Er × B回転プロファイルは、電子反磁性ドリフト方向のプラズマ回転と、周辺乱流のデコリレーション速度を数倍超えるセパラトリクス近傍の顕著な回転シアの両方を決定する。

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textor高精度(タイトル一致)

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Edge localized modeH-modeLimiterTEXTOR
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