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Bursty transport in tokamak turbulence: Role of zonal flows and internal transport barriers

S. Benkadda, P. Beyer, N. Bian, C. Figarella, O. Garcia, X. Garbet, P. Ghendrih, Y. Sarazin, P.H. Diamond2001年被引用 40Nuclear FusionIF 3出版社

Large scale transport events are studied using two different 3-Dsimulation codes related to resistive ballooning and ion temperature gradientturbulence. The turbulence is driven by a constant incoming flux. In the caseof resistive ballooning simulations, the underlying structures are found to beradially elongated on the low field side and distorted by magnetic shear inthe parallel direction (streamers). The non-linear character of these structures isemphasized. Bursty transport is investigated in the presence of zonal flows andinternal transport barriers generated either by a strong shear flow or with amagnetic shear reversal. In deriving a low dimensional model that captures themain features of bursty transport dynamics, it is found that E × B shear flow isnecessary to trigger the bursts.

日本語訳

大規模輸送イベントは、抵抗性バルーニングおよびイオン温度勾配乱流に関連する2つの異なる3-Dシミュレーションコードを用いて研究される。乱流は一定の入射フラックスによって駆動される。抵抗性バルーニングシミュレーションの場合、基礎となる構造は低磁場側で半径方向に伸長し、平行方向の磁気シアによって歪められる(ストリーマー)ことが見出される。これらの構造の非線形的性質が強調される。バースティー輸送は、帯状流と、強いシア流または磁気シア反転のいずれかによって生成される内部輸送障壁の存在下で調査される。バースティー輸送ダイナミクスの主な特徴を捉える低次元モデルを導出する際に、E × Bシア流がバーストを引き起こすために必要であることが見出される。

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Transport barrierZonal flowInternal transport barrier
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