A backward wave oscillator (BWO) is introduced in the paper. On the accelerator of Simus-700,it is experimentally investigated. Under the condition that the electron energy is 740 keV, the beam current is 7 kA and the guiding magnetic field is at 0.68 T, the performance of 1.15 GW microwave output power at 9.1 GHz microwave frequency with 22 ns pulse width and 22% conversion efficiency are reached.
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