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A simple model of interactions between electron temperature gradient and drift-wave turbulence

Published Web Location

https://doi.org/10.1063/1.1646675
Abstract

The interactions between ion temperature gradient-driven drift waves (DITG) and electron temperature gradient (ETG) turbulence were studied using simple models for the individual instability dynamics. A generalized k-space diffusion tensor was derived to represent the random shearing action of the DITG turbulence. The shearing due to short-wavelength DITG modes was shown to have a significant impact on large-scale ETG structures. The results indicate that DITG-induced fluctuation effect is significant when the amplitude of the gradient modulation is comparable to the equilibrium deviation from marginality.

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