Effect of current corrugations on the stability of the tearing mode

Details Effect of current corrugations on the stability of the tearing mode Effect of current corrugations on the stability of the tearing mode

2009-01-19

arxiv.org/abs/0901.2845v1

Physics

Plasma Physics

Accepted to Physics of Plasmas

Scientific paper

10.1063/1.3079077

The generation of zonal magnetic fields in laboratory fusion plasmas is predicted by theoretical and numerical models and was recently observed experimentally. It is shown that the modification of the current density gradient associated with such corrugations can significantly affect the stability of the tearing mode. A simple scaling law is derived that predicts the impact of small stationary current corrugations on the stability parameter $\Delta'$. The described destabilization mechanism can provide an explanation for the trigger of the Neoclassical Tearing Mode (NTM) in plasmas without significant MHD activity.

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