Title :
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
fDate :
10/1/1994 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
