Research progresses on Cherenkov and transit-time high-power microwave sources at NUDT

Matter and Radiation at Extremes - Tập 1 - Trang 163-178 - 2016
Jiande Zhang1, Xingjun Ge1, Jun Zhang1, Juntao He1, Yuwei Fan1, Zhiqiang Li1, Zhenxing Jin1, Liang Gao1, Junpu Ling1, Zumin Qi1
1Laboratory of High Power Microwave Technology, National University of Defense Technology, Changsha 410073, People's Republic of China

Tóm tắt

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 2 GW microwave power with a pulse duration of 110 ns in 30 Hz repetition mode. Both L- and P-band compact RBWOs generated over 2 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 1.755 GHz MILO produced 3.1 GW microwave power with power efficiency of 10.4%. A 9.37 GHz TKA produced the 240 MW microwave power with the gain of 34 dB. A 14.3 GHz TTO produced 1 GW microwave power with power efficiency of 20%.

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