Simulation of lossy interaction structure for Ka-band Gyro-TWT

The analysis of the lossy interaction structure for Ka-band Gyro-TWT has been carried out and discussed. In this paper, dispersion and interaction impedance characteristics of the interaction structure have been determined using 3-D simulator CST-MWS. The beam-wave interaction analysis has been carried out using particle-in-cell (PIC) code MAGIC. The simulated result shows that the interaction structure can produce more than 30 kW output power, 40 dB saturated gain, and 3dB bandwidth for Ka-band. The method of broad banding a gyro-TWT at relatively large gain by lossy loading the circular waveguide by axially periodic loaded dielectric have been presented in this paper.