Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1739804 | Matter and Radiation at Extremes | 2016 | 16 Pages |
Abstract
Research progresses on Cherenkov and transit-time high-power microwave (HPM) sources in National University of Defense Technology (NUDT) of China are presented. The research issues are focused on the following aspects. The pulse-shortening phenomenon in O-type Cerenkov HPM devices is suppressed. The compact coaxial relativistic backward-wave oscillators (RBWOs) at low bands are developed. The power efficiency in M-Type HPM tubes without guiding magnetic field increased. The power capacities and power efficiencies in the triaxial klystron amplifier (TKA) and relativistic transit-time oscillator (TTO) at higher frequencies increased. In experiments, some exciting results were obtained. The X-band source generated 2Â GW microwave power with a pulse duration of 110Â ns in 30Â Hz repetition mode. Both L- and P-band compact RBWOs generated over 2Â GW microwave power with a power efficiency of over 30%. There is approximately a 75% decline of the volume compared with that of conventional RBWO under the same power capacity conditions. A 1.755Â GHz MILO produced 3.1Â GW microwave power with power efficiency of 10.4%. A 9.37Â GHz TKA produced the 240Â MW microwave power with the gain of 34Â dB. A 14.3Â GHz TTO produced 1Â GW microwave power with power efficiency of 20%.
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Authors
Jiande Zhang, Xingjun Ge, Jun Zhang, Juntao He, Yuwei Fan, Zhiqiang Li, Zhenxing Jin, Liang Gao, Junpu Ling, Zumin Qi,