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Stability of Double Tearing Mode in Current Hole Configuration
takashi Tuda,Gen-Ichi Kurita,Takaaki Fujita 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
A current profile with a strong current peak on the outside of a region with almost zero current density was observed in current hole experiments. Such a profile offers the possibility of having a good stability for double tearing modes, even where two resonant surfaces exist, because no magnetohydrodynamic activity identified for a double tearing mode was observed. We examine the stability of a double tearing mode for a current profile with a strong peak around an inner resonant surface and show that the profile is stable for a double tearing mode if the peak exists inside of the surface. This fact shows the possibility of stabilizing a double tearing mode by a localized co-drive current.