Abstract
The possibility of explaining the nature of low-frequency oscillations observed in devices with non-neutral plasma by the instability of the relative azimuth motion of non-neutral plasma components and by anisotropy of the ion distribution function is discussed. The resonance condition for ions with a diocotron mode with a finite value of the longitudinal wave vector kz is studied. Numerical estimations are made for the plasma parameters and unstable oscillations, that are characteristic for experiments. Frequencies, growth rates, and other characteristics and features of the expected electron-ion instability are estimated. The conclusion is made that the nature of low-frequency oscillations observed in devices with non-neutral plasma can be explained by this instability.
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