Theory and new amplification regime in periodic multimodal slow wave structures with degeneracy interacting with an electron beam

MAK Othman, VA Tamma… - IEEE Transactions on …, 2016 - ieeexplore.ieee.org
We present the theory of a new amplification regime in traveling wave tubes (TWTs)
composed of a slow wave periodic structure that supports multiple electromagnetic modes …

[HTML][HTML] Exceptional degeneracies in traveling wave tubes with dispersive slow-wave structure including space-charge effect

K Rouhi, R Marosi, T Mealy, AF Abdelshafy… - Applied physics …, 2021 - pubs.aip.org
The interaction between a linear electron beam and a guided electromagnetic wave is
studied in the context of exceptional points of degeneracy (EPD) supported by such an …

[HTML][HTML] Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

MAK Othman, M Veysi, A Figotin, F Capolino - Physics of plasmas, 2016 - pubs.aip.org
We propose a new amplification regime based on a synchronous operation of four
degenerate electromagnetic (EM) modes in a slow-wave structure and the electron beam …

Low starting electron beam current in degenerate band edge oscillators

MAK Othman, M Veysi, A Figotin… - IEEE Transactions on …, 2016 - ieeexplore.ieee.org
We propose a new principle of operation in vacuum electron-beam-based oscillators that
leads to a low beam current for starting oscillations. The principle is based on …

A new amplification regime for traveling wave tubes with third-order modal degeneracy

F Yazdi, MAK Othman, M Veysi… - … on Plasma Science, 2017 - ieeexplore.ieee.org
Engineering of the eigenmode dispersion of slow wave structures (SWSs) to achieve
desired modal characteristics is an effective approach to enhance the performance of high …

Electron-beam-driven devices with synchronous multiple degenerate eigenmodes

AF Abdelshafy, MAK Othman, F Yazdi… - … on Plasma Science, 2018 - ieeexplore.ieee.org
We provide here a comprehensive exposition of a novel dispersion engineering framework
for high-power electron-beam-driven devices based on multiple degenerate eigenwave …

[图书][B] An analytic theory of multi-stream electron beams in traveling wave tubes

A Figotin - 2020 - books.google.com
The Traveling Wave Tubes (TWT) is a powerful vacuum electronic device used to amplify
radio-frequency (RF) signals as well as numerous applications such as radar, television and …

Extension of the Pierce model to multiple transmission lines interacting with an electron beam

VA Tamma, F Capolino - IEEE transactions on plasma science, 2014 - ieeexplore.ieee.org
A possible route toward achieving high-power microwave (HPM) devices is through the use
of novel slow-wave structures, represented by multiple coupled transmission lines (MTLs) …

The field theory of collective Cherenkov radiation associated with electron beams

E Schamiloglu, A Figotin - Physics of Plasmas, 2024 - pubs.aip.org
Classical Cherenkov radiation is a celebrated physics phenomenon of electromagnetic (EM)
radiation stimulated by an electric charge moving with constant velocity in a three …

Parametric modeling of serpentine waveguide traveling wave tubes

K Rouhi, R Marosi, T Mealy, A Figotin… - IEEE Transactions on …, 2024 - ieeexplore.ieee.org
A simple and fast model for numerically calculating small-signal gain in serpentine
waveguide traveling-wave tubes (TWTs) is described. In the framework of the Pierce model …