A criterion due to N. Krall for magnetic shear stabilization of the Lower-Hybrid Drift Instability is applied to model profiles of the Reverse-Field Screw Pinch configuration. Conditions that can virtually eliminate this instability are found nu¬merically, for gentle density profiles. However, shear-stabilization proves to be ineffective for sharper (but still reasonable-looking) profiles. If such profiles have to be lived with, it becomes necessary to rely either on finite-beta stabilization or on the fact that this instability possesses a threshold related to ion gyro-resonance.
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