Abstract
The effects of an ambipolar field on the stability of electrostatic drift waves in sheet plasmas are investigated numerically. The analysis is based on an integral equation in the wave number space derived from the profiles of Gaussian density and parabolic ambipolar potential. The ambipolar field dependence of the eigenfrequency and eigenfunction of the drift waves is obtained. It is found that the drift waves are stabilized for a strong ambipolar potential of both the hill-type and well-type. The stabilization is due to the ion Landau damping caused by the velocity shear effect of the E × B drift. Purely growing (zero real frequency) drift modes are also found in the case of a hill-type ambipolar potential.
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