Abstract
Microstability properties of the Tormac sheath are discussed with particular emphasis on the influence of strong inhomogeneities and magnetic shear on the lower-hybrid-drift and mirror-drift-cone instabilities. It is found that magnetic shear can completely stabilize the lower-hybrid-drift instability (Maxwellian ions), and lead to a reduction in growth rate of the mirror-drift-cone instability (loss-cone ions). The persistence of the mirror-drift-cone instability (at a reduced growth rate) in the presence of moderate magnetic shear suggests that the addition of a cold plasma component (as in the 2X-IIB mirror experiment) may be desirable to further reduce the instability growth rate and suppress the associated anomalous transport.
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