Linear stability of tearing modes

Quasi-linear evolution of tearing modes

Stability of short wavelength tearing and twisting modes

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 h...

Temperature-Gradient-Driven Tearing Modes

The observation of spontaneous islands growth in tokamak experiments indicates that the tearing mode could also be linearly unstable. However, in the framework of resistive magnetohydrodynamics, previous works have demonstrated that drift effects, electron heat transport along magnetic field lines and ion Larmor radius effects have stabilizing effects. Recently, numerical calculations and analy...

Plasma rotation effects on neoclassical tearing modes

The effect of an equilibrium sheared ow on the nonlinear evolution of a neoclassical tearing mode is investigated by estimating the inuence it has on the inner and outer layer dynamics of the mode. Two complementary approaches are adopted. A generalized Rutherford model calculation is carried out to estimate the ow contributions to the polarization current term in the inner layer. For the ou...

Control of Neoclassical Tearing Modes for Improved Performance in Iter