Azimuthal Surface Waves in Low-Density Plasma Loaded, Coaxial Helix Traveling-Wave-Tube-Like Waveguides

Abstract

The dispersion properties of flute electromagnetic waves propagating across an external axial static magnetic field in traveling-wave-tube-like waveguides with low-density plasma filling are investigated. The cylindrical structure consists of a central dielectric rod, placed inside a plasma coaxial layer with a metallic helix sheath on its outer interface, and a metal screen separated from the helix by another dielectric layer.