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The role of magnetic shear for zonal flow generation

Published online by Cambridge University Press:  12 September 2006

J. ANDERSON  and
H. NORDMAN
J. ANDERSON
Affiliation:
Department of Fundamental Energy Science, Graduate School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan ([email protected])
H. NORDMAN
Affiliation:
Department of Radio and Space Science, EURATOM-VR Association Chalmers, University of Technology, Göteborg, Sweden
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Abstract

The role of magnetic shear for zonal flow generation by ion temperature gradient and trapped electron (TE) mode turbulence is studied analytically using fluid descriptions. The scaling of the zonal flow (ZF) growth rate with magnetic shear is examined and compared with linear growth rates for typical tokamak parameter values. The results indicate that large levels of ZF are obtained in regions of negative magnetic shear, especially for ZF driven by TE mode turbulence. The strong magnetic shear scaling obtained for TE-mode-driven ZFs originates from the bounce average of the electron magnetic drifts.

Type
Letter to the Editor
Information
Journal of Plasma Physics , Volume 72 , Issue 5 , October 2006 , pp. 609 - 615
Copyright
2006 Cambridge University Press

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