Magnetic island evolution in rotating plasmas

摘要

The time evolution of the magnetic island formed at the tearing stable rational surface by the external magnetic flux perturbation in the plasma with poloidal flow is investigated numerically by using the resistive magnetohydrodynamic (MHD) model and the magnetic island is found to show rapid growth after the reduced growth phase due to the plasma, rotation. It was also found that the Onset condition of this rapid growth depends on the resistivity, but does not depend oil the viscosity. in the parameter regime used in this study. On the other hand, the time constant of the rapid growth phase is almost independent of both the plasma resistivity and the viscosity. This rapid growth of magnetic island is the possible candidate for the trigger problem of the neoclassical tearing mode in a tokamak.