Abstract
The paper presents the thermal analysis of the Magnetron Injection Gun for 42 GHz, 200 kW gyrotron, which is used to provide a high quality hollow electron beam. The Finite Element Analysis code ANSYS has been used for the thermal and the structural simulation. The thermal analysis of the structure of Magnetron Injection Gun has been carried out to find out the effect of heater temperature required for maintaining more than 1,000°C at cathode emitter surface to get 10 A of beam current. These results have been experimentally verified. The experimental results closely match the ANSYS results. The effect of the radial expansion of the emitter radius on beam quality has also been analyzed.
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