Dependence of Parasitic Modes on Geometry and Attenuation in Gyrotron Beam Tunnels

Author

Latsas, G.P. ; Ioannidis, Z.C. ; Tigelis, I.G.

Author_Institution

Dept. of Electron., Comput., Telecommun., & Control, Nat. & Kapodistrian Univ. of Athens, Athens, Greece

Volume

40

Issue

6

fYear

2012

fDate

6/1/2012 12:00:00 AM

Firstpage

1538

Lastpage

1544

Abstract

Recent high-power gyrotrons, capable of producing radio-frequency power above 1 MW, often suffer from parasitic oscillations in the beam tunnel, despite the presence of dielectric loading materials intended to prevent the growth of such modes. Such oscillations affect the operation and the efficiency of these devices significantly. Lately, a variety of dielectric materials have been used, with limited success, in ring-loaded beam tunnels to suppress unwanted oscillations. In this paper, we perform an extended parametric study of the effects of beam-tunnel geometry and lossy material properties on the damping of such oscillations.

Keywords

dielectric materials; gyrotrons; oscillations; tunnels; attenuation; beam-tunnel geometry; dielectric loading materials; gyrotron beam tunnels; lossy material property; parasitic modes; parasitic oscillation; radio-frequency power; ring-loaded beam tunnels; Ceramics; Dielectrics; Geometry; Gyrotrons; Oscillators; Permittivity; Dielectric losses; gyrotron beam tunnel; parasitic oscillations;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2012.2192294

Filename

6179552