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A 40A triode-type magnetron injection gun for a 1MW, 120GHz gyrotron has been designed. The preliminary design has been obtained by using some trade-ofi equations. Computer simulation has been performed by using the commercially available code EGUN and the in-house developed code MIGANS. The operating voltages of the modulating anode and the accelerating anode are 60kV and 80kV, respectively. The electron beam with a low transverse velocity spread (-fl?max = 3:3%) and velocity ratio, fi = 1:38 at beam current = 40A is obtained. The simulated results of the MIG obtained with the EGUN code have been validated with another trajectory code TRAK. The results on the design output parameters obtained by these two codes were found to be in close agreement. The sensitivity study has been carried out by changing the difierent gun parameters to decide the fabrication tolerance.

NUMERICAL SIMULATION OF MAGNETRON INJECTION GUN FOR 1MW 120 GHZ GYROTRON