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A review of zonal flow experiments

Akihide Fujisawa2009年被引用 323Nuclear FusionIF 3出版社

The present status of zonal flow experiments is reviewed with the historical process to attain the concept of zonal flows, which provides a new framework for understanding turbulence and transport in toroidal plasmas. The existence of zonal flows is experimentally confirmed to present a new paradigm of plasma turbulence. The paper presents contemporary experiments on zonal flows as major topics with a brief presentation of the zonal flow theories, the diagnostics and data processing techniques for turbulence and zonal flows and the peripheral issues of zonal flow physics. The accumulated experimental results introduced in this review include identification of zonal flows (both stationary zonal flows and geodesic acoustic modes), nonlinear interactions between zonal flows and turbulence, quantification of turbulent Reynolds stress, flow dynamics, energy transfer dynamics between turbulent wave components and the effects of zonal flows on plasma transport. These results have given rise to a new paradigm, namely, that the plasma turbulence is a system of zonal flows and drift waves, with an emphasis on the interaction between the disparate scale structures, e.g. zonal flows (mesoscale) and turbulence (micro-scale).

日本語訳

トロイダルプラズマにおける乱流と輸送を理解するための新しい枠組みを提供する帯状流の概念に到達するまでの歴史的過程とともに、帯状流実験の現状をレビューする。帯状流の存在は実験的に確認され、プラズマ乱流の新たなパラダイムを提示している。本論文では、帯状流に関する実験を主要なテーマとして取り上げ、帯状流理論の概要、乱流および帯状流の診断法とデータ処理手法、ならびに帯状流物理の周辺課題について簡潔に述べる。本レビューで紹介する蓄積された実験結果には、帯状流(定常帯状流および測地線音響モード)の同定、帯状流と乱流の非線形相互作用、乱流レイノルズ応力の定量化、流動ダイナミクス、乱流波動成分間のエネルギー伝達ダイナミクス、および帯状流がプラズマ輸送に及ぼす影響が含まれる。これらの結果は、プラズマ乱流が帯状流とドリフト波のシステムであるという新たなパラダイムを生み出し、異なるスケールの構造間の相互作用、すなわち帯状流(メソスケール)と乱流(マイクロスケール)の相互作用に焦点を当てている。

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Zonal flow
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