Stability of short wavelength tearing and twisting modes
نویسنده
چکیده
The stability and mutual interaction of tearing and twisting modes in a torus is governed by matrices that generalize the well-known 0 stability index. The diagonal elements of these matrices determine the intrinsic stability of modes that reconnect the magnetic eld at a single resonant surface. The o -diagonal elements indicate the strength of the coupling between the di erent modes. We show how the elements of these matrices can be evaluated, in the limit of short wavelength, from the free energy driving radially extended ballooning modes. We apply our results by calculating the tearing and twisting 0 for a model high-beta equilibrium with circular ux surfaces. Pacs: 52.30.-q, 52.30.Jb, 52.35.Py
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