New paradigm for suppression of gyrokinetic turbulence by velocity shear

G. M. Staebler; R. E. Waltz; J. Candy; J. E. Kinsey

doi:10.1103/PhysRevLett.110.055003

New paradigm for suppression of gyrokinetic turbulence by velocity shear

G. M. Staebler, R. E. Waltz, J. Candy, J. E. Kinsey

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85 Scopus citations

Abstract

The shear in the mean field velocity Doppler shift is shown to suppress the amplitude of electric potential fluctuations by inducing a shift in the peak of the radial wave number spectrum. An analytic model of the process shows that the fluctuation spectrum shifts in the direction where the velocity shear is linearly destabilizing but that nonlinear mixing causes a recentering of the spectrum about a shifted radial wave number at reduced amplitude A model for the 2D nonlinear spectrum is used in a quasilinear calculation of the transport that is shown to accurately reproduce the suppression of energy and particle transport and the Reynolds stress due to the velocity shear.

Original language	English
Article number	055003
Journal	Physical Review Letters
Volume	110
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.110.055003
State	Published - Jan 30 2013
Externally published	Yes

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10.1103/PhysRevLett.110.055003

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New paradigm for suppression of gyrokinetic turbulence by velocity shear

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