Analysis on the TM modes of axial vircator driven by electron beam

Axial vircators driven by hollow electron beam and solid electron beam, respectively, are compared with each other and analyzed theoretically. The output power of microwave under the same structural parameters was numerically calculated for comparison. Further analysis on the radius of electron beams for the TM01, the TM02 and the TM03 modes was also carried out. PIC simulations using KARAT are accordant with the calculation. Results show that the power of TM01 mode driven by the solid electron beam is higher than the case of hollow electron beam, but in the case of the higher order TM0n modes, the hollow electron beam is probably better for the power generation of microwaves.