RT Journal Article
T1 Zonal flows and long-distance correlations during the formation of the edge shear layer in the TJ-II stellarator
A1 Calvo, Iván
A1 Carreras, Benjamín A.
A1 García Gonzalo, Luis
A1 Pedrosa, M. A.
A1 Hidalgo, Carlos
AB 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.
PB IOP Publishing
SN 0741-3335 (Print)
SN 1361-6587 (Online)
YR 2009
FD 2009-06
LK https://hdl.handle.net/10016/7414
UL https://hdl.handle.net/10016/7414
LA eng
NO 12 pages, 7 figures.-- PACS nrs.: 52.55.Hc, 52.30.-q, 52.40.Hf, 52.25.Fi, 52.35.Ra, 52.25.Gj.-- ArXiv pre-print available at: http://arxiv.org/abs/0904.2551
NO Part of this research was sponsored by the Dirección General de Investigación of Spain underproject ENE2006-15244-C03-01. BAC acknowledges the financial support of Universidad Carlos III and Banco Santander through a Cátedra de Excelencia.
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RD 19 may. 2024