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The expression for the free energy of arbitrary perturbations of general Vlasov-Maxwell equilibria derived by Morrison and Pfirsch is transformed and put in a concise form, which is subsequently evaluated for arbitrary equilibria which have one ignorable coordinate, such as axisymmetric and helical equilibria, in the case of internal perturbations (ie perturbations which vanish outside the plasma, and on its boundary). In order to generate the electric currents necessary for equilibrium in the presence of pressure gradients, the equilibrium distribution function of at least one particle species must be anisotropic. As a consequence, these equilibria always allow negative-energy perturbations, without requiring a large spatial variation of the perturbation across the equilibrium magnetic field.

Additional information

Authors: CORREA-RESTREPO D, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);PFIRSCH D, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 6/346 EN (1996) 18pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
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