Electron Beam Defocusing for the Collector of W-band large power Gyrotron

The power dissipation of the collector is based on the theory by adding the external coils outside the collector which generates vertical or transverse magnetic field to modify the trajectory of electrons on the collector. In this paper, three power dissipation methods of the thermal loading on the collector for a 94GHz large power gyrotron are described and simulated the trajectory of electrons with CST Particle Studio. The approaches described are the vertical field sweeping system (VFSS), the transverse field sweeping system (TFSS), and the method of synthesis combine VFSS with TFSS, respectively. The results are revealed and discussed though modeling and simulation.