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A high‐frequency oscillating electric field can change the properties of diocotron modes in non‐neutral plasmas. The effect depends crucially on the azimuthal mode number, m, of the applied field. For m=0,±1 there is no effect, and for applied standing waves there is also no effect. But if the applied field has the form of a traveling wave with ‖m‖≥2, the frequency of stable diocotron modes can be modified and for ‖m‖≥3, the l=2 instability of hollow density profiles can be stabilized. The analytic results are verified with a nonlinear fluid simulation of an infinitely long non‐neutral plasma.

The effect of externally applied oscillating electric fields on the l=1 and l=2 diocotron modes in non-neutral plasmas