Abstract
Drift waves in a rotating toroidal plasma are considered for an axisymmetric, large aspect-ratio tokamak with concentric, circular magnetic surfaces. The analysis performed is based on rigorously derived eigenmode equations, coupled in poloidal mode numbers through the toroidal effects. Analytical dispersion relations for both global and propagating drift waves are obtained and their simple solutions are found for some limiting cases. The principal effect of plasma rotation is that the global drift mode existence criterion can be satisfied for large values of the magnetic shear parameter, s>1/2, in the case of sufficiently high rotation velocity, when the Doppler shifted eigenfrequency changes sign. Such plasma rotation velocities have been observed in the Doublett III-D (DIII-D) tokamak in the high (H)-mode confinement regime [Kim et al., Phys. Rev. Lett. 72, 2199 (1994)].
Published Version
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