Thermal analysis of Magnetron Injection Gun

The paper presents the Thermal analysis of Magnetron Injection Gun (MIG), which is used to provide a high quality hollow beam of electrons for Gyro devices. Thermal analysis of 16 KV MIG is carried out to minimize heater power required for maintaining more than 950° C at cathode emitter surface to get 2A of beam current for temperature limited mode of operation in Gun Collector module for Gyro TWT. After detailed analysis minimum heater power of 33W is estimated as requirement. Further reduction in heater power to 25W is achieved by decreasing the heat conduction path through structural change.