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Experimental and numerical characterization of the turbulence in the scrape-off layer of MAST

F Militello, P Tamain, W Fundamenski, A Kirk, V Naulin, A H Nielsen, the MAST team2013年Plasma Physics and Controlled FusionIF 2.2出版社

Numerical simulations of interchange turbulence in the scrape-off layer are performed in a regime relevant for a specific L-mode Mega Ampere Spherical Tokamak (MAST) discharge. Such a discharge was diagnosed with a reciprocating arm equipped with a Gundestrup probe. A detailed comparison of the average and statistical properties of the simulated and experimental ion saturation current is performed. Good agreement is found in the time-averaged radial profile, in the probability distribution functions and in qualitative features of the signals such as the shape, duration and separation of burst events. These results confirm the validity of the simple interchange model used and help us to identify where it can be improved. Finally, the simulated data are used to assess the importance of the temperature fluctuations on plasma potential and radial velocity measurements acquired with Langmuir probes. It is shown that the correlation between the actual plasma quantities and the signal of the synthetic diagnostics is poor, suggesting that accurate measurements of the temperature fluctuations are needed in order to obtain reliable estimates of the perpendicular fluxes.

日本語訳

特定のLモード・メガアンペア球状トカマク(MAST)放電に関連する条件下で、スクレイプオフ層における交換型乱流の数値シミュレーションを実施した。このような放電は、往復駆動アームに搭載されたグンデストルッププローブを用いて診断された。シミュレーションと実験から得られたイオン飽和電流の平均的性質および統計的性質を詳細に比較した。時間平均された動径プロファイル、確率分布関数、およびバースト事象の形状・持続時間・分離間隔などの定性的特徴において、良好な一致が得られた。この一致は、使用した単純な交換型モデルの妥当性を確認するとともに、モデルの改善が必要な箇所を示唆している。さらに、シミュレーションデータを用いて、ラングミュアプローブで測定されたプラズマ電位および動径速度に対する電子温度変動の影響を評価した。その結果、実際のプラズマ物理量とプローブ診断から得られる信号との間の相関は低く、垂直方向フラックスを正確に推定するためには、温度変動の精密な測定が不可欠であることが示された。

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Scrape-off layerMAST
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