Moment equations treatment of the reconnecting mode
Abstract
The theory of an unstable mode with azimuthal wave number m = 1, called the reconnecting mode, under conditions where the ideal MHD theory would predict a stable mode with spatial singularity at a specified radius, is presented. The reconnecting mode owes its existence to reconnection of the field lines made possible by plasma resistivity, and its radial profile and frequency of oscillation are similar in nature to those of known tearing modes. Stability analysis is performed on the basis of relevant moment equations. In the limit of relatively high temperatures, the effects of finite ion gyroradius and electron drift frequency significantly modify the radial mode profile and drastically reduce its growth rate. The mode acquires a frequency of oscillation with a phase velocity about equal to that of the electron drift wave.
 Publication:

Nuclear Fusion
 Pub Date:
 December 1977
 Bibcode:
 1977NucFu..17.1245B
 Keywords:

 Magnetic Field Configurations;
 Magnetohydrodynamic Stability;
 Plasma Control;
 Plasma Cylinders;
 Plasma Waves;
 Current Density;
 High Temperature Plasmas;
 Ionic Collisions;
 Lines Of Force;
 Plasma Conductivity;
 Plasma Layers;
 Singularity (Mathematics);
 Toroidal Plasmas;
 Plasma Physics