Nonlinear damping of zonal flows

Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X16080067· OSTI ID:22614094

Smolyakov, A. I. ^[1]; Mendonca, J. T. ^[2]

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1. University of Saskatchewan, Department of Physics and Engineering Physics (Canada)
2. Instituto Superior Técnico, Instituto de Plasmas e Fusão Nuclear (Portugal)

The modulatonal instability theory for the generation of large-scale (zonal) modes by drift modes has been extended to the second order including the effects of finite amplitude zonal flows, ϕ{sub q}. The nonlinear (second-order) sidebands are included in the perturbative expansion to derive the nonlinear equation for the evolution of ϕ{sub q}. It is shown that effects of finite ϕ{sub q} reduce the growth rate of zonal flow with a possibility of oscillatory regimes at a later stage.

• OSTI ID: 22614094
• Journal Information: Plasma Physics Reports, Vol. 42, Issue 8; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
DAMPING
EQUATIONS
NONLINEAR PROBLEMS
PLASMA INSTABILITY