Email this article Nonlinear damping of zonal flows
- Authors: Koshkarov O.1, Smolyakov A.I.1,2, Mendonca J.T.3
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Affiliations:
- Department of Physics and Engineering Physics
- National Research Centre Kurchatov Institute
- Instituto de Plasmas e Fusão Nuclear
- Issue: Vol 42, No 8 (2016)
- Pages: 769-772
- Section: Nonlinear Phenomena
- URL: https://journals.rcsi.science/1063-780X/article/view/185910
- DOI: https://doi.org/10.1134/S1063780X16080067
- ID: 185910
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Abstract
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, ϕq. The nonlinear (second-order) sidebands are included in the perturbative expansion to derive the nonlinear equation for the evolution of ϕq. It is shown that effects of finite ϕq reduce the growth rate of zonal flow with a possibility of oscillatory regimes at a later stage.
About the authors
O. Koshkarov
Department of Physics and Engineering Physics
Author for correspondence.
Email: koshkarov.alexandr@usask.ca
Canada, Saskatoon, SK, S7N 5E2
A. I. Smolyakov
Department of Physics and Engineering Physics; National Research Centre Kurchatov Institute
Email: koshkarov.alexandr@usask.ca
Canada, Saskatoon, SK, S7N 5E2; pl. Akademika Kurchatova 1, Moscow, 123182
J. T. Mendonca
Instituto de Plasmas e Fusão Nuclear
Email: koshkarov.alexandr@usask.ca
Portugal, Lisboa, 1049-001
