Ayan Kumar Bandyopadhyay

Phase–velocity disk model for predicting output-gap velocity distribution for the design of high-efficiency Klystrons

Abstract Klystrons require continued efficiency improvement to satisfy the growing demands of energy efficiency in modern high power microwave and accelerator systems. At the output gap, the phase–velocity distribution of the bunched electron beam governs beam-to-RF energy extrac...

Design and simulation of high bandwidth compact folded waveguide slow wave structure for 0.65 THz traveling wave tube

This paper presents the design and simulation of a compact Folded Waveguide Slow-wave Structure for a 0.65 THz traveling-wave tube aimed at achieving a balance between bandwidth, output power, and fabrication-oriented structural simplicity. The proposed structure is analytically...

Analytical calculation of field enhancement factor of 2D structure graphene film

Field emitters are one of the promising electron sources for vacuum electronic devices operating in mm-wave and terahertz frequencies, where emission performance is critically governed by the field enhancement factor. While extensive analytical models exist for one-dimensional em...