An equilibrium model for RFP plasmas in the presence of resonant tearing modes

Details An equilibrium model for RFP plasmas in the presence of resonant tearing modes An equilibrium model for RFP plasmas in the presence of resonant tearing modes

2002-06-03

arxiv.org/abs/physics/0206006v3

Plasma Physics and Controlled Fusion, vol. 45 (2003), p. 1-26

Physics

Plasma Physics

Final accepted version. 36 pages

Scientific paper

10.1088/0741-3335/45/1/301

The equilibrium of a finite-beta RFP plasma in the presence of saturated-amplitude tearing modes is investigated. The singularities of the MHD force balance equation JXB=grad(p) at the modes rational surfaces are resolved through a proper regularization of the zeroth-order (equilibrium) profiles, by setting to zero there the gradient of the pressure and parallel current density. An equilibrium model, which satisfies the regularization rule at the various rational surfaces, is developed. The comparison with the experimental data from the Reversed Field eXperiment (RFX) gives encouraging results. The model provides an easy tool for magnetic analysis: many aspects of the perturbations can be analyzed and reconstructed.

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