Low heater power of cathode for gyrotron travelling wave tube

To reduce the Gyro-TWT cathode heating power, the paper adopts a new cathode structure with opening slot and adding heat shield on its support cylinder. The finite element analysis software ANSYS is used to optimize the number and the depth of slot and analyze the impact of heat shield on the cathode temperature. The relationship between the temperature of cathode emitter and the depth of slot is given. With the same temperature of cathode emitter, the heating power of the optimized structure is compared with that of the original structure. The results show that the heating power of the optimized structure decreases about 40%, greatly reducing the cathode heating power, which provide a certain reference value for the development of high performance cathode of gyrotron traveling wave tube.