Simulation for the design of a frequency stable vircator

John Kim

doi:10.1117/12.2301643

1 December 1990 Simulation for the design of a frequency stable vircator

John Kim

Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 15146H (1990) https://doi.org/10.1117/12.2301643
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States

Abstract

Using the "MAGIC" code, computer simulation is performed to design a cathode structure which provides a radial distribution of electron beam density matching the field distribution of the TM₀₆ mode. Thus, very narrow band TM₀₆ mode microwave radiation can be generated in an open end waveguide. The cylinderical cathode structure consists of three pieces; a solid central piece together with two concentric rings. The radii of the two rings are determined by the radial locations of the second and third peaks of the Bessel function J0(kr). The thickness of each cathode piece and the gaps between anode slits and each cathode piece are chosen with the aid of the simulation such that the current density in the waveguide downstream of the anode slits is uniformly peaked at the peak locations of J0(kr). The simulation results show that the vircator can indeed be operated at the selected frequency 12.5 GHz with a very narrow bandwidth(Δω/ω<1 %).

Citation Download Citation

John Kim "Simulation for the design of a frequency stable vircator", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15146H (1 December 1990); https://doi.org/10.1117/12.2301643

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