Numerical Analysis of CurrentDriven DriftWave Instability in a Finiteβ Plasma
Abstract
Stability of the collisionless drift wave localized to the rational surface is studied numerically. Both the current and the finiteβ effects are taken into account. The results confirm the previous analytical and/or numerical results concerning the stableness in the currentless case, instability driven by the current and its finiteβ stabilitzation in the short wavelength region. In addition, a strong resonant coupling of the drift wave to the Alfvén wave is found to occur due to the combined effect of the current and the finiteβ value, resulting a destabilizing effect in the long wavelength region. The critical electron drift velocity for the onset of the instability is calculated. The result shows a substantial reduction of the critical velocity by the finiteβ effect.
 Publication:

Journal of the Physical Society of Japan
 Pub Date:
 September 1979
 DOI:
 10.1143/JPSJ.47.984
 Bibcode:
 1979JPSJ...47..984U
 Keywords:

 Collisionless Plasmas;
 Magnetohydrodynamic Stability;
 Numerical Analysis;
 Plasma Waves;
 Toroidal Plasmas;
 Eigenvectors;
 Electric Current;
 Electric Fields;
 ElectronIon Recombination;
 Spatial Distribution;
 Trapped Particles;
 Wavelengths;
 Plasma Physics