Highly efficient gyrotron with multi-stage recuperation of residual electron energy

The results of combined simulation of physical processes in a medium power gyrotron of 4-mm wavelength range are presented. The methods of improving the quality of helical electron beam and the electron efficiency of the gyrotron, based on the optimization of electric field distribution in the near-cathode region, are realized. The design of the collector with 4-stage recovery of residual beam energy, based on the method of spatial separation of electrons in crossed azimuthal magnetic and axial electric fields, was developed. The value of total efficiency of the gyrotron equal to 71.8% was achieved by improving the quality of the electron beam and by efficient energy recovery in the collector region.