Abstract
The effects of sheared plasma rotation on the toroidal drift eigenmodes are studied for an axisymmetric, large aspect-ratio tokamak with concentric, circular magnetic surfaces. The performed analysis is based on a consistent derivation of the drift eigenmode equations, which are coupled in the poloidal mode numbers due to toroidicity. Analytical dispersion relations for both global and propagating drift waves are obtained and their approximative solutions are found. It is shown that the type of the mode is defined by the sign of the Doppler-shifted eigenfrequency that varies from one magnetic surface to another due to sheared poloidal and toroidal plasma rotation velocities. The global drift mode existence is attributed to the case of the negative Doppler-shifted eigenfrequencies, whereas the propagating drift waves are generated by the positive ones.
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