Abstract
In this paper the stability of plasma in a toroidal system is investigated, for drift type oscillations which have phase velocities in the range vTc » ω/k|| » vTi. Making the assumption that the shear is not too small, our main attention is turned to finding out whether or not curvature of the lines of force causes any new instabilities to appear not already present in the slab-model approximation to the magnetic field. It is well known that, in this approximation, there is just one large-scale instability, namely the temperature drift instability. It is shown here that, when the temperature gradient differs from zero, particle drift due to the magnetic field gradient allows large-scale oscillations to be excited with a localization region having a width which exceeds that characteristic of the electrons:
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