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Dynamic properties of ηi-mode weak turbulence

Published online by Cambridge University Press:  13 March 2009

Alireza Pakyari  and
Vladimir P. Pavlenko
Alireza Pakyari
Affiliation:
Department of Technology, EURATOM–NFR Fusion Association, Uppsala University, PO Box 534, S-751 21 Uppsala, Sweden
Vladimir P. Pavlenko
Affiliation:
Department of Technology, EURATOM–NFR Fusion Association, Uppsala University, PO Box 534, S-751 21 Uppsala, Sweden
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Abstract

The turbulence of the toroidal ηi mode has a forward spectral cascade. This means that most of the energy initially placed in the low-wavenumber region (the linear instability region) will be spread out towards high-wavenumber modes. Therefore the linear instability may be reduced by this energy cascade. An elementary estimate of the critical amplitude for nonlinear mode coupling to balance the linear growth rate is given. As a consequence of three wave cascade process derivable from the fully toroidal fluid model equations, the formation of zonal flows ηi-mode turbulence is predicted.

Type
Research Article
Information
Journal of Plasma Physics , Volume 55 , Issue 1 , February 1996 , pp. 47 - 58
Copyright
Copyright © Cambridge University Press 1996

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