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An approach to modeling a resonant meanderline attenuator of helical slow-wave structure for a travelingwave tube is presented that uses eigen-mode solver in HFSS. The dispersion, interaction impedance and attenuation characteristics of the structure in the presence of the resonant attenuator were predicted using the model and were validated against experimental results, published elsewhere.

This paper describes the design of an electron gun and focusing system for a multi-beam klystron amplifier. The electron gun is designed for a beam voltage of 2.5 kV and a current of 700 mA, which is equally distributed among the 19 beamlets. An electrostatic and a magnetostatic focusing system have been investigated using 2.5D and 3D simulation codes.