Interaction of a Tubular Charged-Particle Beam with Eigenwaves of a Plasma Solid-State Cylinder Located in Strong Longitudinal Magnetic Field

The excitation theory of electromagnetic waves in a cylindrical magnetoplasma solid-state waveguide when a magnetized tubular electron beam blows around it is developed. It is shown that the eigen hybrid bulk-surface or surface electromagnetic waves of helicon origin are excited in the waveguide when the conditions of a quasi-stationary electromagnetic field are satisfied. Their excitation is carried out by the beam space-charge field with matching of the longitudinal components of electric field. It is noted that helicons and waves of their nature are formed in a conducting plasma medium in the assistance of an external magnetic field. It is shown that the instability of coupled waves occurs in the electrodynamic system due to the Vavilov-Cherenkov effect.