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Tearing-mode stability in a cylindrical plasma with equilibrium flows

Published online by Cambridge University Press:  13 March 2009

K. P. Wessen  and
M. Persson
K. P. Wessen
Affiliation:
Department of Theoretical Physics and Plasma Research Laboratory, Research School of Physical Sciences, The Australian National University, G.P.O. Box 4, Canberra, A.C.T. 2601, Australia
M. Persson
Affiliation:
Department of Theoretical Physics and Plasma Research Laboratory, Research School of Physical Sciences, The Australian National University, G.P.O. Box 4, Canberra, A.C.T. 2601, Australia
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Abstract

The effect of a sheared equilibrium mass flow on the resistive tearing mode is studied numerically by calculating Δ′. Both stabilizing and destabilizing effects are found, depending on the velocity and magnetic field profiles. Specifically, when q0 ≈ 1, the flow is strongly stabilizing for centrally peaked current profiles, whereas the flow has a strongly destabilizing effect for flatter current profiles. While the extreme effects are more pronounced for larger flows, a smaller flow may have more influence on marginal stability. The case where the flow speed becomes comparable to the Alfvén speed is also examined. It is found that this may lead to the equations being singular at points other than a rational surface, drastically changing the behaviour of the mode.

Type
Research Article
Information
Journal of Plasma Physics , Volume 45 , Issue 2 , April 1991 , pp. 267 - 283
Copyright
Copyright © Cambridge University Press 1991

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