PIC Simulation of the Dynamics of Electrons in a Conical Vircator

We presented a vircator with conical ballistic focusing and carried out the PIC simulation of the dynamics of electrons in it. It is shown that the virtual cathode has the shape of a curvilinear figure of rotation. It was found that the oscillations in the vircator are resonant at a single frequency. The dependence of the vircator oscillation frequency of the current beam was calculated. The oscillation frequency monotonically increases from 2 to 6 GHz with the increase in the current beam from 10 to 50 kA, but the average power of microwave radiation grows nonmonotonically.