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The low-frequency instability of a cylindrical poorly magnetized plasma withan inward-directed radial electric field is studied changing the gas pressureand the ion cyclotron frequency. The unstable frequency always decreases whenthe gas pressure is increased indicating collisional effects. At a fixedpressure, the unstable frequency increases with the magnetic field when theB-field is low and decreases at larger magnetic field strength. We find thatthe transition between these two regimes is obtained when the ion cyclotronfrequency equals the ion-neutrals collision frequency. This is in agreementwith the theory of the slow-ion drift instability induced by the collisionalslowing of the electric ion drift (A. Simon, Phys. Fluids 6, 382, (1963).

physics of plasmas

The slow collisional ExB ion drift characterized as the major  instability mechanism of a poorly magnetized plasma column with an  inward-directed radial electric field