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Wave kinetic equation for inhomogeneous drift-wave turbulence beyond the quasilinear approximation
Ruiz, D. E.; Glinsky, M. E.; Dodin, I. Y.
AA(Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA), AB(Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185, USA), AC(Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA)
Journal of Plasma Physics, Volume 85, Issue 1, article id. 905850101, 26 pp.
Publication Date:
plasma nonlinear phenomena, plasma waves
Abstract Copyright:
(c) 2019: © Cambridge University Press 2019
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The formation of zonal flows from inhomogeneous drift-wave (DW) turbulence is often described using statistical theories derived within the quasilinear approximation. However, this approximation neglects wave-wave collisions. Hence, some important effects such as the Batchelor-Kraichnan inverse-energy cascade are not captured within this approach. Here we derive a wave kinetic equation that includes a DW collision operator in the presence of zonal flows. Our derivation makes use of the Weyl calculus, the quasinormal statistical closure and the geometrical-optics approximation. The obtained model conserves both the total enstrophy and energy of the system. The derived DW collision operator breaks down at the Rayleigh-Kuo threshold. This threshold is missed by homogeneous-turbulence theory but expected from a full-wave quasilinear analysis. In the future, this theory might help better understand the interactions between drift waves and zonal flows, including the validity domain of the quasilinear approximation that is commonly used in the literature.
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