Long-distance correlation and zonal flow structures induced by mean e × B shear flows in the biasing H-mode at TEXTOR

Y. Xu, S. Jachmich, R. R. Weynants, M. Van Schoor, M. Vergote, A. Krämer-Flecken, O. Schmitz, B. Unterberg, C. Hidalgo

Research output: Contribution to journalArticlepeer-review

Abstract

Long-distance toroidal correlations of potential and density fluctuations have been investigated at the TEXTOR tokamak [H. Soltwisch, Plasma Phys. Controlled Fusion 26, 23 (1984)] in edge electrode-biasing experiments. During the biasing-induced H-mode, the dc E × B shear flow triggers a zonal flow structure and hence long-distance correlation in potential fluctuations, whereas for density fluctuations there is nearly no correlation. These results indicate an intimate interaction between the mean and zonal flows, and the significance of long range correlations in improved-confinement regimes.

Original languageEnglish
Article number110704
Pages (from-to)110704
Number of pages1
JournalPhysics of Plasmas
Volume16
Issue number11
DOIs
Publication statusPublished - 2009

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