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Plasma confinement modification and convective transport suppression in the scrape-off layer using additional gas puffing in the STOR-M tokamak

M Dreval, M Hubeny, Y Ding, T Onchi, Y Liu, K Hthu, S Elgriw, C Xiao, A Hirose2013年Plasma Physics and Controlled FusionIF 2.2出版社

The influence of short gas puffing (GP) pulses on the scrape-off layer (SOL) transport is studied. Similar responses of ion saturation current and floating potential measured near the GP injection valve and in the 90° toroidally separated cross-section suggest that the GP influence on the SOL region should be global. A drop in plasma temperature and a decrease in the rotational velocity of the plasma are observed in the SOL region immediately after the GP pulse; however, an unexpected increase in electron and ion temperatures is observed in the second stage of the plasma response. The decrease in floating potential fluctuations indicates that the turbulent transport is dumped immediately after the GP pulse. The GP-induced modification of turbulence properties in the SOL points to a convective transport suppression in the STOR-M tokamak. A substantial decrease in the skewness and kurtosis of ion saturation current fluctuations is observed in the SOL region resulting in the probability distribution function (PDF) getting closer to the Gaussian distribution. The plasma potential reduction, the change in plasma rotation and the suppression of turbulent transport in the SOL region indicate that the plasma confinement is modified after the GP injection. Some features of the H-mode-like confinement in the plasma bulk also accompany the SOL observations after application of the additional sharp GP pulse.

日本語訳

スクレイプオフ層(SOL)輸送に対する短時間ガスパフ(GP)パルスの影響を研究した。GP入射弁近傍およびトロイダル方向に90度離れた断面で測定されたイオン飽和電流と浮遊電位の類似した応答は、GPの影響がSOL領域において全体的であることを示唆している。GPパルス直後のSOL領域では、プラズマ温度の低下とプラズマ回転速度の減少が観測された。しかし、プラズマ応答の第二段階では、電子温度とイオン温度の予期しない上昇が観測された。浮遊電位変動の減少は、GPパルス直後に乱流輸送が抑制されたことを示している。SOLにおけるGP誘起の乱流特性の変化は、STOR-Mトカマクにおける対流輸送の抑制を示している。SOL領域ではイオン飽和電流変動の歪度と尖度の大幅な減少が観測され、その結果、確率分布関数(PDF)がガウス分布に近づいた。プラズマ電位の低下、プラズマ回転の変化、およびSOL領域における乱流輸送の抑制は、GP入射後にプラズマ閉じ込めが変更されたことを示している。追加の鋭いGPパルス印加後には、SOLにおけるこれらの観測に伴い、プラズマ本体でもHモード様閉じ込めの特徴がいくつか観測された。

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Scrape-off layerPlasma confinementGas puff
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