Design Study of a 0.2-THz Traveling-Wave Tube With Multiple Sheet Electron Beam

In this article, we present the results of numerical design and modeling of an electron gun with an impregnated thermionic cathode producing a triple elliptic-shaped electron beam of
$0.1\ \text{mm}\times 0.6\ \text{mm}$
dimensions of each beamlet. Such a beam interacts with a higher-order TE30 mode of the dual-grating staggered slow-wave structure (SWS). The 0.2-THz SWS with dielectric absorbers to prevent backward-wave excitation of lower-order transverse modes is designed and simulated.