A general treatment of ion resonance instability for a non-neutral plasma column is performed using a macroscopic cold-fluid-Maxwell model. The azimuthal motion of the plasma components has an important influence on the behaviour of the instability. When the electrons are in slow rotational equilibrium, the instability occurs in both slow arid fast ion rotational equilibrium. However, there is stability when the electrons are in fast rotational equilibrium except that the 1=1 mode becomes unstable and independent of plasma rotation. The kink (/ = 1) mode only occurs when the plasma column boundary; exceeds a certain threshold value that depends on the ratio of the plasma frequency to the cyclotron frequency.
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