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Nonlinear translational symmetric equilibria relevant to the L–H transition

Published online by Cambridge University Press:  12 November 2012

Ap. KUIROUKIDIS  and
G. N. THROUMOULOPOULOS
Ap. KUIROUKIDIS
Affiliation:
Technological Education Institute of Serres, 62124 Serres, Greece
G. N. THROUMOULOPOULOS
Affiliation:
Department of Physics, University of Ioannina, Association Euratom-Hellenic Republic, 45110 Ioannina, Greece ([email protected])
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Abstract

Nonlinear z-independent solutions to a generalized Grad–Shafranov equation (GSE) with up to quartic flux terms in the free functions and incompressible plasma flow non-parallel to the magnetic field are constructed quasi-analytically. Through an ansatz, the GSE is transformed to a set of three ordinary differential equations and a constraint for three functions of the coordinate x, in Cartesian coordinates (x,y), which then are solved numerically. Equilibrium configurations for certain values of the integration constants are displayed. Examination of their characteristics in connection with the impact of nonlinearity and sheared flow indicates that these equilibria are consistent with the L–H transition phenomenology. For flows parallel to the magnetic field, one equilibrium corresponding to the H state is potentially stable in the sense that a sufficient condition for linear stability is satisfied in an appreciable part of the plasma while another solution corresponding to the L state does not satisfy the condition. The results indicate that the sheared flow in conjunction with the equilibrium nonlinearity plays a stabilizing role.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 3 , June 2013 , pp. 257 - 265
Copyright
Copyright © Cambridge University Press 2012 

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