Stabilization of neoclassical tearing modes by an externally applied static helical field.
The effect of a static helical magnetic field on the nonlinear growth of the neoclassical tearing mode (NTM) is investigated. The NTM is found to be stabilized by an externally applied helical field of a different helicity if the field magnitude is sufficiently large, suggesting a very simple method for stabilizing the NTM. The mechanism responsible for this stabilization is the decreased fundamental harmonic pressure perturbation of the NTM in the presence of the helical field.
Yu
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Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany.
Günter
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Lackner
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