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Toroidal equilibrium states with reversed magnetic shear and parallel flow in connection with the formation of Internal Transport Barriers

Part of: Focus on Fusion

Published online by Cambridge University Press:  13 April 2015

Ap. Kuiroukidis  and
G. N. Throumoulopoulos
Ap. Kuiroukidis
Affiliation:
Technological Education Institute of Serres, 62124 Serres, Greece
G. N. Throumoulopoulos*
Affiliation:
Physics Department, University of Ioannina, GR 451 10 Ioannina, Greece
*
†Email address for correspondence: gthroum@cc.uoi.gr
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Abstract

We construct nonlinear toroidal equilibria of fixed diverted boundary shaping with reversed magnetic shear and flows parallel to the magnetic field. The equilibria have hole-like current density and the reversed magnetic shear increases as the equilibrium nonlinearity becomes stronger. Also, application of a sufficient condition for linear stability implies that the stability is improved as the equilibrium nonlinearity correlated to the reversed magnetic shear gets stronger with a weaker stabilizing contribution from the flow. These results indicate synergetic stabilizing effects of reversed magnetic shear, equilibrium nonlinearity and flow in the establishment of Internal Transport Barriers (ITBs).

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 4 , August 2015 , 905810404
Copyright
Copyright © Cambridge University Press 2015 

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