Zhang Yunjian

Design of a high-efficiency C-band backward wave oscillator

For practicability of the high power microwave source, a C-band backward wave oscillator (BWO) which has high conversion efficiency is designed. When the axial guiding magnetic field is 0.83 T, the electron energy and the beam current of the diode are respectively 80 keV and 2.1 kA, a microwave output power of 100 MW at 7.4 GHz microwave frequency with 65% conversion efficiency is achieved in simulation.

Study of a compact external magnetic field radial split-cavity oscillator

With the experiment result analyses of a coaxial virtual cathode oscillator (CVCO), a new kind of compact radial split cavity oscillator (RSCO) is presented in this paper. On the oscillator, a low resistance tube is formed by using the diode structure of a CVCO, and a radial split-cavity structure is formed by several meshes that cause the electronic beam to transmit. Calculating all kinds of parameter, at the input parameter 350 kV, 27 kA, the numerical simulation results show that the average output microwave power is about 4.0 GW, the microwave frequency is 1.37 GHz, and the electronic efficiency is 42.3%.