The role of adiabatic and non-adiabatic phenomena in passing waves from a semi-bounded loss-free waveguide to semi-bounded plasma waveguide

Abstract

Thermal effects have been studied in phenomena of wave transportation from a loss-free isotropic cylindrical metallic waveguide to a semi-bounded warm plasma waveguide. The considered configuration consists of two semi-bounded waveguides which connected to each other. The first part is a dielectric waveguide with loss-free metallic wall and the second part is a cylindrical dielectric waveguide where a warm plasma column is placed on its symmetric axis. An incident wave in a single mode will be inserted from first part toward to second part via transversely anisotropic boundary surface. The incident wave is reflected and transmitted via interface surface of two waveguides. Taking into account the suitable boundary conditions on the interface surface of two waveguides and using warm approximation for the plasma column, the reflection and transmission coefficients of each new modes have been calculated. The reflection and transmission coefficients are function of the geometrical dimensions, the incident wave frequency and the temperature of the plasma. The diagrams of the reflection and transmission coefficients of the reflected and transmitted waves and phase difference of the reflected and transmitted waves respect to the incident wave, in term of the plasma temperature have been investigated.