Abstract
Several existing theoretical treatments of the low-frequency drift instability for low β and low-density plasmas in mirror machines are compared. We point out the importance of boundary conditions, and show that finite Larmor radius stabilization is important for the m = 1 mode. The equation for the electrostatic potential for high densities is solved for some ratios a/r0 of the Larmor radius to the plasma radius. It is found that in the Phoenix experiment, under the present operating conditions, a ratio of a/r0 ≥ 0.5, corresponding to the field of ≤5 kG is sufficient for stability.
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