Abstract
The stability of resistive shell modes (external kink modes) has been analyzed in the RFP configuration surrounded by an external helical current. The helical current is shown to have a stabilizing effect on the external kink modes when the current is in phase with the tangential component of the magnetic perturbation. The current density required to stabilize the unstable modes increases with the gowth rate of the mode. An increase in the distance of the current layer from the plasma surface also leads to an increase in the required current. The relevance of this stabilizing effect of the helical current to the experimental observations is discussed.
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