Numerical studies on the polarities of electromagnetic wave modes in a magnetoplasma-filled cylindrical waveguide

The physical polarities of electromagnetic waves propagating in a magnetoplasma-filled cylindrical waveguide are studied by numerical calculations and simple analytical analyses. In the plane of the frequency axial wave number, the obtained results show that dispersion curves of right-hand polarized (RHP) and left-hand polarized (LHP) electromagnetic waves propagating in an infinite magnetoplasma determine characteristic regions in which wave modes propagating in a magnetoplasma-filled cylindrical waveguide have different physical polarities. The frequency region slightly below and above omega_{r_1} (omega_{r_1} denotes the lower-branch frequency of the RHP electromagnetic wave propagating in an infinite magnetoplasma) is characterized by pure or physical dominant RHP modes. In the frequency region of omega_l {<} omega {<} omega_{r_2} (omega_l and omega_{r_2} denote the frequency of the LHP wave and the upper-branch frequency of the RHP wave propagating in an infinite magnetoplasma), except for formal RHP waveguide EH() u modes with sufficient large axial wave numbers, all modes are pure or dominant physical LHP waves. The frequency region of omega {>} omega_{r_2} can be thought of as a RHP area. The physical polarity of wave modes clarified in this paper is helpful to understand the interaction between charged particles and waves propagating in a magnetoplasma-filled cylindrical waveguide.