The role of magnetic shear for zonal flow generation

Details The role of magnetic shear for zonal flow generation The role of magnetic shear for zonal flow generation

2009-01-14

arxiv.org/abs/0901.2020v1

Journal of Plasma Physics 72, 609 (2006)

Physics

Plasma Physics

12 pages, 4 figures

Scientific paper

10.1017/S002237780600479X

The role of magnetic shear for zonal flow generation by ion-temperature-gradient (ITG-) 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, in particular for ZF driven by TE mode turbulence. The strong magnetic shear scaling obtained for TE mode driven zonal flows originates from the bounce average of the electron magnetic drifts.

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