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Title: Wave-kinetic approach to zonal-flow dynamics: recent advances
Contributors: Zhu, Hongxuan
Dodin, I. Y.
U. S. Department of Energy
Keywords: fusion plasmas
plasma instabilities
plasma waves
Issue Date: Mar-2021
Publisher: Princeton Plasma Physics Laboratory, Princeton University
Related Publication: Physics of Plasmas
Abstract: Basic physics of drift-wave turbulence and zonal flows has long been studied within the framework of wave-kinetic theory. Recently, this framework has been re-examined from first principles, which has led to more accurate yet still tractable "improved" wave-kinetic equations. In particular, these equations reveal an important effect of the zonal-flow "curvature" (the second radial derivative of the flow velocity) on dynamics and stability of drift waves and zonal flows. We overview these recent findings and present a consolidated high-level picture of (mostly quasilinear) zonal-flow physics within reduced models of drift-wave turbulence.
Appears in Collections:Theory and Computation

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