Zonal flows and long-distance correlations during the formation of the edge shear layer in the TJ-II stellarator

Details Zonal flows and long-distance correlations during the formation of the edge shear layer in the TJ-II stellarator Zonal flows and long-distance correlations during the formation of the edge shear layer in the TJ-II stellarator

2009-04-16

arxiv.org/abs/0904.2551v1

Plasma Phys. Control. Fusion 51 (2009) 065007

Physics

Plasma Physics

19 pages, 7 figures

Scientific paper

A theoretical interpretation is given for the observed long-distance correlations in potential fluctuations in TJ-II. The value of the correlation increases above the critical point of the transition for the emergence of the plasma edge shear flow layer. Mean (i.e. surface averaged, zero-frequency) sheared flows cannot account for the experimental results. A model consisting of four envelope equations for the fluctuation level, the mean flow shear, the zonal flow amplitude shear, and the averaged pressure gradient is proposed. It is shown that the presence of zonal flows is essential to reproduce the main features of the experimental observations.

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