Title :
A TM01-mode axial vircator
Author :
Wu, M.W. ; Chen, C.Y. ; Guung ; Hwang, C.S. ; Song, P.S. ; Hou, Wen S.
Abstract :
Summary form only given. The generation of pulsed high-power microwaves from an axial vircator has been investigated experimentally at diode voltages of 200-300 kV and beam currents of 5-8 kA. The major feature of this vircator is that a pseudomicrowave cavity which consists mainly of a stepped electron-drift tube with two different radii of 3.9 cm and 4.9 cm has been introduced. For a proper cathode-anode gap matched to the diode voltage and beam current, very pure and narrowband TM01-mode microwaves have been generated with a pulse duration of ≲10 ns in the dispersed microwave spectrum of a 145.6-m waveguide delay line. The short duration of the microwave pulse indicates that its frequency spread is ≲0.06 GHz with a center frequency at 8.2 GHz, which corresponds to a bandwidth of ~0.7%. At this condition, a microwave peak power of 30 MW has been reached and the electron-beam-to-microwave-power conversion efficiency is 2%
Keywords :
microwave generation; microwave oscillators; 2 percent; 200 to 300 kV; 30 MW; 5 to 8 kA; 8.2 GHz; TM01-mode axial vircator; beam currents; cathode-anode gap; diode voltages; dispersed microwave spectrum; electron-beam-to-microwave-power conversion efficiency; microwave peak power; pseudomicrowave cavity; pulse duration; pulsed high power microwave generation; stepped electron-drift tube;
Conference_Titel :
Plasma Science, 1990. IEEE Conference Record - Abstracts., 1990 IEEE International Conference on
Conference_Location :
Oakland, CA, USA
DOI :
10.1109/PLASMA.1990.110636
