Development of multistage energy recovery system for gyrotrons

A four-stage depressed collector based on spatial separation of electrons with different energies in the crossed electric and magnetic fields was developed for the experimental SPbPU gyrotron. Modeling of the system of electron energy recovery and analysis of the distributions of electric and magnetic fields in the gyrotron collector region were performed. As a result of the theoretical estimations and the trajectory analysis of the helical electron beam, it is shown that the developed system provides recovery of the residual electron energy necessary to achieve the total efficiency of the gyrotron exceeding 70 %.

Высокоэффективный гиротрон с многоступенчатой рекуперацией остаточной энергии электронов

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.