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A new fluid instability has been discovered which arises from the coupling of the drifttearing mode at the diamagnetic frequency with a mode with a velocity just below the curvature drift velocity. This mode, which can also be destabilized by cross-field transport, is unstable over a wide range of conditions and mode numbers for reversed-field pinches or spheromaks.
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Finn et al. (1984) studied this question.
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