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Fluctuations and anomalous transport (in tokamaks, particularly TEXT)

A J Wootton, M E Austin, R D Bengtson, J A Boedo, R V Bravenec, D L Brower, J Y Chen, G Cima, P H Diamond, R D Durst1988年Plasma Physics and Controlled FusionIF 2.2出版社

Links between turbulent fluctuations and transport processes in tokamaks, particularly in TEXT, are discussed. In the plasma edge probes allow detailed measurements of the quantities required to directly determine the fluctuation driven fluxes. The total flux of particles is well explained by the measured electrostatic fluctuation driven flux. However, a satisfactory model to explain the origin of the fluctuations has not been identified. The processes responsible for determining the edge electron heat flux are less clear. In the confinement region experimental observations are restricted to measurements of density and potential fluctuations and their correlations. Three distinct features have been identified: (1) the ubiquitous broadband turbulence and (2) a quasi-coherent feature, both of which propagate in the electron diamagnetic drift direction, and (3) an ion feature which by definition propagates in the ion drift direction. The characteristics of the measured fluctuations are discussed and compared with the predictions of various models. Comparisons between measured particle, electron heat and ion heat fluxes, and those fluxes predicted to result from the measured fluctuations, are made.

日本語訳

トカマク、特にTEXTにおける乱流揺動と輸送過程の間の関連性について論じる。プラズマ端部では、プローブにより、揺動駆動フラックスを直接決定するために必要な量の測定が可能となる。粒子の全フラックスは、測定された静電揺動駆動フラックスによって十分に説明される。しかしながら、揺動の起源を説明する満足のいくモデルは特定されていない。端部電子熱フラックスを決定する原因となる過程はあまり明確ではない。閉じ込め領域では、実験的観測は密度と電位の揺動およびそれらの相関の測定に限定される。三つの異なる特徴が特定されている:(1) 遍在する広帯域乱流と (2) 準コヒーレントな特徴、これらは両方とも電子反磁性方向に伝播し、(3) 定義によりイオンドリフト方向に伝播するイオン特徴である。測定された揺動の特性は議論され、様々なモデルの予測と比較される。測定された粒子、電子熱、イオン熱フラックスと、測定された揺動から生じると予測されるそれらのフラックスとの比較が行われる。

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TEXTAnomalous transport
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