Stability of axially–symmetric lower hybrid modes of single component electron plasma with additive of background gas ions

摘要

The low-frequency spectrum of axially-symmetric modes of oscillations of the nonneutral plasma completely filling a waveguide is evaluated. Plasma consists of cold electrons and a small additive of ions produced by ioniza-tion of neutrals of background gas by electron impact. Ions are described by the equilibrium distribution function adequately taking into account the peculiarity of their formation. The spectrum of oscillations consists of the family of lower hybrid modes and families of "modified" of ion cyclotron (MIC) modes. MIC modes intersecting lower hybrid modes are unstable within a wide range of changing of fields and plasma density due to anisotropy of the ion distribution function.