Nonlinear response of the tearing mode to external field perturbations in a flowing plasma
In this report the study of the interaction of small field perturbations with magnetic islands in a tokamak is extended into the tearing unstable regime to explore the interactions of internally as well as externally driven reconnection processes in the presence of flow. The basic numerical model adopted is that of a 2-dimensional, plane-slab plasma sandwiched between two perfectly conducting walls with periodic boundary conditions in the y-direction. The stability of the tearing mode is controlled by adjusting the wall separation. The simulations show that even for the tearing unstable case the islands and in particular the rotating mode can become highly suppressed. Since this brings the islands close to the scale of the resistive layer it is also not clear that the analytic treatment will be able to predict the onsets of locking and unlocking.
Bibliographic Reference: Article: Theory of Fusion Plasmas - Proceedings of the Joint Varenna-Lausanne International Workshop (1992) pp. 399-406
Record Number: 199310370 / Last updated on: 1994-11-29
Original language: en
Available languages: en