Title :
High-power microwave generation by a plasma-loaded backward-wave oscillator
Author :
Qian, Bao-Liang ; Li, Chuan-Lu ; Liu, Yong-Gui ; Zhong, Hui-Huang ; Zhang, Jian-De ; Tan, Qi-Mei ; Liu, Jin-Liang ; Liu, Cun-Hua ; Chen, Dong-Qun ; Li, Xiang-Sheng ; Liu, Che-Bo
Author_Institution :
Dept. of Appl. Phys., Nat. Univ. of Defense Technol., Hunan, China
Abstract :
High-power microwaves were measured for a frequency range from 9.5 GHz to 13.4 GHz in a plasma-loaded backward-wave oscillator employing an annular relativistic electron beam with kinetic energy varying from 400 keV to 500 keV and current ranging from 1 kA to 3 kA. The relativistic electron beam, which was produced from a helium gas-loaded foil-less diode, was injected into the helium gas-loaded rippled-wall waveguide of the backward-wave oscillator, generating the plasma in the waveguide and then the high-power microwave. The gas-loaded diode operated stably without encountering the closure problem in the He gas pressure range (less than 100 mTorr) which was of interest to the operation of the backward-wave oscillator. An enhancement in the total microwave power emission over the vacuum case by a factor of up to 7 was found in the experiment, and the highest efficiency of electron beam to microwave radiation was estimated to be about 29%
Keywords :
backward wave oscillators; microwave generation; plasma filled waveguides; relativistic electron beam tubes; 100 mtorr; 400 to 500 keV; 9.5 to 13.4 GHz; He; He gas pressure; closure problem; gas-loaded diode; high-power microwave generation; plasma-loaded backward-wave oscillator; relativistic electron beam; Current measurement; Diodes; Electron beams; Energy measurement; Helium; Microwave generation; Microwave measurements; Microwave oscillators; Plasma measurements; Plasma waves;
Conference_Titel :
High-Power Particle Beams, 1998. BEAMS '98. Proceedings of the 12th International Conference on
Conference_Location :
Haifa
Print_ISBN :
0-7803-4287-9
DOI :
10.1109/BEAMS.1998.816984
