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Mixed SOC diffusive dynamics as a paradigm for transport in fusion devices

R. Sánchez, D.E. Newman, B.A. Carreras2001年被引用 55Nuclear FusionIF 3出版社

A recently proposed paradigm for understanding turbulent transport dynamics in magneticallyconfined plasmas, based on the concept of self-organized criticality (SOC), is extended to include the interplay among the many transport mechanisms existing in real plasmas. This extended model might shed some light on the experimentallyobserved violation at fluctuation scales of the scale invariance condition inherent to the standard SOC model. At the same time, it might provide new experimental tests that could help to validate the possible relevance of the SOC model for understanding turbulent plasma dynamics, since somecomputations based on a cellular automata realization of such an extended model reveal a dramatic change in the dynamics, with the edge coming to play a dominantrole. This might give some hints towards understanding the experimental fact relating good plasma core confinement to a good conditioning of the edge within an SOC paradigm.

日本語訳

磁気閉じ込めプラズマにおける乱流輸送ダイナミクスを理解するための、自己組織化臨界性(SOC)の概念に基づいて最近提案されたパラダイムは、実プラズマに存在する多くの輸送機構間の相互作用を含むように拡張される。この拡張モデルは、標準SOCモデルに固有のスケール不変性条件の、ゆらぎスケールで実験的に観測された破れに対して、何らかの光を当てるかもしれない。同時に、それは、乱流プラズマダイナミクスを理解するためのSOCモデルの可能性のある関連性を検証するのに役立つかもしれない新たな実験的検証を提供するかもしれない。というのも、そのような拡張モデルのセルオートマトンによる実現に基づくいくつかの計算が、エッジが支配的な役割を果たすようになるというダイナミクスの劇的な変化を明らかにするからである。これは、SOCパラダイム内で、良好なプラズマコア閉じ込めがエッジの良好な調整に関連するという実験事実を理解するための手がかりを与えるかもしれない。

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