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Envelope nonlinear drift structures in a non-equilibrium plasma near the boundary of marginal stability

Published online by Cambridge University Press:  01 January 1998

TATIANA A. DAVYDOVA  and
ALEXEI YU. PANKIN
TATIANA A. DAVYDOVA
Affiliation:
Plasma Theory Department, Institute for Nuclear Research, pr. Nauki, 47, Kiev – 252022, Ukraine
ALEXEI YU. PANKIN
Affiliation:
Plasma Theory Department, Institute for Nuclear Research, pr. Nauki, 47, Kiev – 252022, Ukraine
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Abstract

An explosive instability of the ion-temperature-gradient (ITG)-driven modes (ηi modes) near the boundary of marginal stability is considered as a driving mechanism for subcritical turbulence. It is shown that boundedness of the wave interaction region leads to saturation of the instability. The possibility of coherent soliton-like structure formation in both slab and toroidal geometries is demonstrated by numerical simulation. An analytical soliton solution is found in some special cases.

Type
Research Article
Information
Journal of Plasma Physics , Volume 59 , Issue 1 , January 1998 , pp. 179 - 191
Copyright
1998 Cambridge University Press

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