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Turbulence spreading in reversed shear plasmas

M Yagi, T Ueda, S-I Itoh, M Azumi, K Itoh, P H Diamond, T S Hahm2006年Plasma Physics and Controlled FusionIF 2.2出版社

Turbulence spreading in reversed shear plasmas is investigated using a simple, multi-fluid model of ITG turbulence in toroidal geometry. The temperature profile modification is accompanied by avalanche processes. In addition, it is found that the turbulence spreads inwards and outwards, owing to the nonlinear interactions of turbulence. Analysis of the simulation results indicates that the spatio-temporal propagation of the turbulence front is quantitatively consistent with the scaling of speed predicted by the Fisher front theory.

日本語訳

逆転シアプラズマにおける乱流拡散は、トロイダル形状でのITG乱流の単純な多流体モデルを用いて調査される。温度プロファイルの変化には、雪崩過程が伴う。さらに、乱流は非線形相互作用により内側と外側の両方へ拡散することが見出される。シミュレーション結果の解析により、乱流フロントの時空間伝播は、Fisherフロント理論によって予測される速度のスケーリングと定量的に一致することが示される。

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Reversed magnetic shear
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