Design and PIC simulation Studies of Cluster Cavity W-Band Gyro-twystron

A W-band gyro-twystron operating in fundamental TE
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using clustered cavity has been designed and studied for its performance improvement. The designed amplifier has been modeled in 3D PIC code “CST particle-in-cell code”. The simulation of the present gyro-twystron predicted an RF output power ~78 kW at 94 GHz for the gyrating beam of 65 kV and 6 A with 4% velocity spread. The half power bandwidth has been calculated as ~ 2.6 GHz, which is approximately 1.5 times more than that of a conventional design. The saturated gain and conversion efficiency of the amplifier have been calculated as ~36 dB and ~20 %, respectively.