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Influence of long-scale length radial electric field components on zonal flow-like structures in the TJ-II stellarator

U Losada, A Alonso, B Ph van Milligen, C Hidalgo, B Liu, M A Pedrosa, C Silva, the TJ-II team2016年Plasma Physics and Controlled FusionIF 2.2出版社

The influence of long-scale length radial electric fields on zonal flows-like structures has been studied in the TJ-II stellarator. This relation has been investigated in the edge plasma using two electrical rake probes. The results presented here show an empirical correlation between the properties of long-range correlations (LRCs) with zonal flow-like structures and the magnitude of radial (neoclassical, NC) electric fields in TJ-II neutral beam heated plasmas. These experimental findings show that the enhancement of the NC radial electric field increases the magnitude of LRCs, considered as a proxy of zonal flows, while the radial correlation length of the plasma potential fluctuations was found to decrease by about 40%. A strong relation between the magnitude of electric field structures with long and short radial scales was found. The calculated shearing rate corresponding to the short scale length structures of the radial electric field may be sufficient to regulate turbulence.

日本語訳

長スケール長の径方向電場が帯状流様構造に及ぼす影響が、TJ-IIステラレータにおいて研究された。この関係は、2つの電気的レーキプローブを用いて周辺プラズマ中で調査された。ここで示す結果は、長距離相関(LRC)の特性と帯状流様構造との間の経験的相関、およびTJ-II中性粒子ビーム加熱プラズマにおける径方向(新古典論的、NC)電場の大きさとの間の経験的相関を示すものである。これらの実験的知見は、NC径方向電場の増強がLRCの大きさを増大させることを示しており、LRCは帯状流の代理指標とみなされる一方、プラズマ電位ゆらぎの径方向相関長は約40%減少することが見出された。長い径方向スケールと短い径方向スケールを持つ電場構造の大きさの間に強い関係が見出された。短いスケール長に対応する径方向電場構造に基づく計算されたせん断速度は、乱流を抑制するのに十分である可能性がある。

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tj-ii高精度(タイトル一致)

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StellaratorZonal flowTJ-IIRadial electric field
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