Design of interaction circuit and collector for W-band continuous wave 30 kW gyrotron oscillator

A W-band fundamental harmonic continuous wave single-cavity gyrotron oscillator with the operating mode TE02 has been designed according to the electron cyclotron maser theory of gyrotron with self-consistent nonlinear beam-wave interaction code. The simulation result shows that the output power and the electron efficiency of the designed gyrotron oscillator is 31.8 kW and 35%, respectively, on the basis of the electron beam with voltage 30 kV, current 3.0 A and velocity ratio 1.5. In addition, the design and simulation of the gyrotron oscillator’s collector has been finished with the help of PIC software. The simulation result indicates that the power density on the collector wall would be less than 500 W/cm2 by using auxiliary coils which can effectively shorten the axial size of the