FDTD investigation of cylindrical waveguides with azimuthal corrugations excited by axisymmetric TE modes

Issue title: 20th International Symposium on Applied Electromagnetics and Mechanics

Guest editors: Theodoros Theodoulidis, Christos Antonopoulos, Nikolaos Kantartzis, Ioannis Rekanos and Theodoros Zygiridis

Article type: Research Article

Authors: Peponis, Dimitrios^a; | Latsas, George^a | Tigelis, Ioannis^a

Affiliations: [a] Department of Physics, National and Kapodistrian University of Athens, Athens, Greece

Correspondence: [*] Corresponding author: Dimitrios Peponis, Department of Physics, National and Kapodistrian University of Athens, University Campus 15784, Athens, Greece. E-mail: [email protected]

Abstract: In this work we investigated the scattering parameters and mode conversion of axisymmetric TE modes in smooth cylindrical waveguides with wedge-shaped azimuthal corrugations. In particular, we studied the effect of the length of the corrugated region on the scattering parameters and on the mode conversion. The field distribution was derived by the FDTD code COCHLEA and further post-processed using the COPP code. Results showed that the incident mode is converted to an ensemble of modes, the azimuthal indices of which are given by the SHM criterion. Azimuthal corrugated waveguides are usually employed in the gyrotron beam-tunnel to enhance the suppression of the parasitic modes.

Keywords: FDTD, computational electromagnetics, gyrotron, beam tunnels

DOI: 10.3233/JAE-220094

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 71, no. S1, pp. S3-S12, 2023