Trapped electron stabilization of ballooning modes in low aspect ratio toroidal plasmas

The kinetic effects of trapped electron dynamics and finite gyroradii and magnetic drift motion of ions are shown to give rise to a large parallel electric field and hence a parallel current that greatly enhances the stabilizing effect of field line tension for ballooning modes in low aspect ratio toroidal plasmas. For large aspect ratio the stabilizing effect increases (reduces) the β(=2P/B2) threshold for the first (second) stability of the kinetic ballooning mode (KBM) from the magnetohydrodynamics (MHD) β threshold value by a factor proportional to the trapped electron density fraction. For small aspect ratio the stabilizing effect can greatly increase the β threshold of the first stability of KBMs from the MHD β threshold by Sc≃1+(ne/neu)δ, where ne/neu is the ratio of the total electron density to the untrapped electron density, and δ depends on the trapped electron dynamics and finite gyroradii and magnetic drift motion of ions. If ne/neu≫1 as in the National Spherical Torus Experiment (NSTX) [M. O...