Gyro-TWT Using a Metal PBG Waveguide as Its RF Circuit—Part II: PIC Simulation and Parametric Analysis


During this paper, three-D electromagnetic particle-in-cell (PIC) simulation of gyro-TWT amplifier employing a metal photonic bandgap (PBG) waveguide as its RF interaction circuit is presented. A industrial finite integration-primarily based PIC simulation code CST Particle Studio has been used to study the beam–wave interaction mechanism. The mode selectivity of a PBG waveguide has been investigated in the absence of an electron beam, therefore as to get the one-mode operation in a gyro-TWT. The simulated PBG gyro-TWT made a stable RF output power of kW at thirty five GHz for a 72-keV, ten-A annular electron beam with a velocity ratio of one.05. The instantaneous bandwidth has been obtained as % with respect to the operating frequency. Furthermore, the performance of the simulated PBG gyro-TWT has also been investigated through the parametric variation of the velocity unfold, beam voltage, beam current, axial magnetic field, beam pitch factor, and the RF input power to validate the conceptual style of the device.

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