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Large scale dynamics in flux driven gyrokinetic turbulence

Y. Sarazin, V. Grandgirard, J. Abiteboul, S. Allfrey, X. Garbet, Ph. Ghendrih, G. Latu, A. Strugarek, G. Dif-Pradalier2010年被引用 82Nuclear FusionIF 3出版社

The turbulent transport governed by the toroidal ion temperature gradient driven instability is analysed with the full-f global gyrokinetic code GYSELA (Grandgirard et al2007 Plasma Phys. Control. Fusion49 B173) when the system is driven by a prescribed heat source. Weak, yet finite, collisionality governs a neoclassical ion heat flux that can compete with the turbulent driven transport. In turn, the ratio of turbulent to neoclassical transport increases with the source magnitude, resulting in the degradation of confinement with additional power. The turbulent flux exhibits avalanche-like events, characterized by intermittent outbursts which propagate ballistically roughly at the diamagnetic velocity. Locally, the temperature gradient can drop well below the linear stability threshold. Large outbursts are found to correlate with streamer-like structures of the convection cells albeit their Fourier spectrum departs significantly from that of the most unstable linear modes. Last, the poloidal rotation of turbulent eddies is essentially governed by the radial electric field at moderate density gradient.

日本語訳

トロイダルイオン温度勾配駆動不安定性によって支配される乱流輸送を、全粒子(full-f)ジャイロ運動論的大域コードGYSELA(Grandgirard et al 2007 Plasma Phys. Control. Fusion49 B173)を用いて、系が規定の熱源によって駆動される場合について解析する。弱いながらも有限の衝突性が、乱流輸送と競合し得る新古典イオン熱流束を支配する。その結果、乱流輸送と新古典輸送の比は熱源の大きさとともに増大し、追加加熱に伴う閉じ込めの劣化をもたらす。乱流フラックスは、ほぼ反磁性ドリフト速度で弾道的に伝播する間欠的なバーストを特徴とする雪崩的イベントを示す。局所的には、温度勾配は線形安定性閾値を大きく下回ることがある。大きなバーストは、対流セルのストリーマー状構造と相関することが見出されるが、そのフーリエスペクトルは最も不安定な線形モードのそれとは有意に異なる。最後に、乱流渦のポロイダル回転は、中程度の密度勾配においては本質的に動径電場によって支配されることを示す。

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