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Zonal flow in toroidal ion temperature gradient mode turbulence

Published online by Cambridge University Press:  01 August 2007

INGMAR SANDBERG  and
V. P. PAVLENKO
INGMAR SANDBERG
Affiliation:
National Technical University of Athens, Department of Electrical and Computer Engineering GR–157 73 Athens, Euratom–Hellenic Republic Fusion Association, Greece(sandberg@central.ntua.gr)
V. P. PAVLENKO
Affiliation:
Uppsala University, Department of Astronomy and Space Physics, Box 515, SE–751 20 Uppsala, Euratom–VR Fusion Association, Sweden
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Abstract

The properties of zonal flows in the toroidal ion temperature gradient mode turbulence are investigated taking into account the polarization drift effects. The stability criterion and the characteristic oscillation frequency of the zonal flow are determined in terms of the spectra of turbulent fluctuations. The nonlinear evolution of zonal flows may lead to the formation of stationary long-lived coherent structures supporting stationary shear layers. These results indicate the existence of regions with reduced levels of anomalous transport attributed to zonal flows generalizing previous findings regarding zonal flows in electron drift turbulence.

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Type
Papers
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Journal of Plasma Physics , Volume 73 , Issue 4 , August 2007 , pp. 565 - 573
Copyright
Copyright © Cambridge University Press 2006

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