Experimental evidence for the intimate interaction among sheared flows, eddy structures, reynolds stress, and zonal flows across a transition to improved confinement

I. Shesterikov, Y. Xu, G. R. Tynan, P. H. Diamond, S. Jachmich, P. Dumortier, M. Vergote, M. Van Schoor, G. Van Oost

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

Dedicated experiments have been carried out at the TEXTOR tokamak in biasing-induced improved confinement regimes using Langmuir probe and GPI measurements. The results show the first evidence for the intimate interaction among sheared flows, eddy structures, Reynolds stress, zonal flows, and ambient fluctuations during a transition to an improved confinement. The sheared flows impose dynamic effects on turbulence structures, resulting in generation of Reynolds stress and zonal flows and eventually the suppression of background fluctuation levels via nonlinear energy transfer processes. The latter may therefore trigger a transition to the H mode.

langue originaleAnglais
Numéro d'article055006
journalPhysical Review Letters
Volume111
Numéro de publication5
Les DOIs
étatPublié - 1 août 2013

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