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Braginskii's two-fluid equations are employed to obtain the eigenmode equations governing low-n singular modes in toroidal geometry. It is shown that the pressure of the ion fluid tends to be constant along the magnetic field lines, as also does that of the electron fluid, and the parallel electric field tends to vanish. The finite-gyroradius (FGR) effect is recovered by taking into consideration the diamagnetic drift velocity and the gyroviscosity of the ion fluid. The results show that the toroidal effect gives rise not only to the so-called apparent mass effect, but also to an enhancement of the FGR and equilibrium electric field effects. These are even more important than in the cylindrical equilibrium model.

Additional information

Authors: ZHENG L-J, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Physics of Fluids B, Vol. 5 (1993) No. 7, pp. 1962-1970
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