A twononlinearity model of dissipative drift wave turbulence
A simple, onefield, twononlinearity, drift wave model equation is derived to describe the dynamics of a nonuniform magnetized plasma by taking into account the effects of dissipative trapped electron response in the turbulence dynamics. Because of the nonadiabatic response of trapped electrons, mode couplings by both the [bold E][times][bold B] drift and the polarization drift nonlinearities are present. In this work, the statistical dynamics for this dissipative drift wave turbulence is investigated using the EDQNM (eddydamped quasinormal Markovian) closure scheme. In particular, apart from the eddy viscosity, a large nonlinear frequency shift is shown to be induced by cross coupling of the two nonlinearities. Thus instability drive is modified by this turbulent back reaction. By taking into account this selfconsistency effect, a wave kinetic equation is derived, and the density fluctuation spectrum is obtained in different parameter ranges. The results show that the dynamics of dissipative drift wave turbulence is fundamentally different from that of the familiar HasegawaMima model, because [bold E][times][bold B] drift nonlinearity blocks the low[ital k] condensation of fluctuation energy. It is shown that both the [bold E][times][bold B] drift nonlinearity and the nonlinear frequency shift effect transfer energy nonlocally from large to small scales and, inmore »
 Authors:

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^{[1]};
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 (Department of Physics, University of California, San Diego, California 92093 (United States))
 (Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States))
 Publication Date:
 OSTI Identifier:
 6695076
 DOE Contract Number:
 FG0388ER53275; FG0289ER53291
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Fluids B; (United States); Journal Volume: 5:4
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TURBULENCE; KINETIC EQUATIONS; PLASMA CONFINEMENT; PLASMA DRIFT; TOKAMAK DEVICES; TRAPPED ELECTRONS; VISCOSITY; CLOSED PLASMA DEVICES; CONFINEMENT; ELECTRONS; ELEMENTARY PARTICLES; EQUATIONS; FERMIONS; LEPTONS; THERMONUCLEAR DEVICES 700340*  Plasma Waves, Oscillations, & Instabilities (1992)