Abstract
Plasma flow-shear effects on nonlinear saturation of electron drift waves are analyzed in the weak turbulence regime. Flow shear can enhance ion Compton scattering of long-wavelength electron drift waves not only by modifying the beat wave–ion resonance condition, but also via the radial dependence of linear susceptibility. A nonlinear dispersion relation is obtained as a solution of the radially nonlocal nonlinear eigenmode equation. At nonlinear saturation, the spectral intensity of the fluctuations scales with flow shear as (∂V0φ/∂r)−2 in addition to the linear dependence on the linear growth rate, and decays according to a power law kθ−1.
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