Experimental proof-of-principle results on a mode-selective input coupler for gyrotron applications

Author

Tate, Jeffrey P. ; Guo, Hezhong ; Naiman, Matthew ; Chen, Leemian ; Granatstein, Victor L.

Author_Institution

Lab. for Plasma Res., Maryland Univ., College Park, MD, USA

Volume

42

Issue

10

fYear

1994

fDate

10/1/1994 12:00:00 AM

Firstpage

1910

Lastpage

1917

Abstract

Proof-of-principle results for a mode selective input coupler are presented. Transmission and reflection measurements for the TE₀₂ cylindrical waveguide mode are given along with the output mode pattern. The results show good agreement for the cutoff frequency, mode pattern general behavior and variation with frequency for signals above cutoff. A maximum passband of 1.2 GHz (~7%) has been achieved. Comparisons with theory for overall frequency response (from 15 to 18 GHz) and mode pattern characteristics (at 17.5 GHz) are also presented. The design and concept are promising for harmonic gyrotron-traveling-wave-tube amplifier and phase-locked gyrotron oscillator applications

Keywords

circular waveguides; gyrotrons; microwave amplifiers; microwave oscillators; travelling-wave-tubes; waveguide couplers; 15 to 18 GHz; TE₀₂ cylindrical waveguide mode; cutoff frequency; gyrotron applications; maximum passband; mode pattern general behavior; mode-selective input coupler; output mode pattern; phase-locked oscillator; proof-of-principle results; reflection measurements; transmission measurements; traveling-wave-tube amplifier; Circuits; Couplings; Cutoff frequency; Cyclotrons; Electron beams; Frequency response; Gyrotrons; Optical reflection; Passband; Power harmonic filters;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.320773

Filename

320773