DIMOHA

A numerical tool for traveling-wave tubes simulations.

Illustration: Electron momenta from a simulation of the wave-particle interaction

Traveling-wave tubes are electronic tubes used to amplify radio-waves, which have a lot of applications, from radar to space telecommunication or plasmas characterisation. Simulations of traveling-wave tubes in nonlinear regime is a challenge due to the large number of parameters involved and require new numerical tools such as DIMOHA. DIMOHA is built for industrial design, telecommunication operations and wave-particle research.

• Collaboration:
  • Centre National d'Études Spatiales CNES (French space agency)
  • Thales Group (Satellite manufacturer)
  • PIIM laboratory, Aix-Marseille University-CNRS
• Technologies:
  • Python (numpy, matplotlib)
  • Fortran (lapack, fftw)
  • Matlab
  • Message passing interface (MPI)
  • High-performance computing (HPC)

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ChoCoTeX

Fast equation generator

ChoCoTeX is an open-source web application to generate vector PDF with a transparent background from LaTeX equations. Those PDF can be copied in the clipboard and immediately pasted in typesetting or presentation softwares, such as Word or PowerPoint. ChoCoTeX use the web framework Django.

• Technologies:
  • Python
  • Django
  • HTML / CSS
  • LaTeX
• Link:

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The traveling-wave tube in the history of telecommunication

Published article

• Abstract: The traveling-wave tube is a critical subsystem for satellite data transmission. Its role in the history of wireless communications and in the space conquest is significant, but largely ignored, even though the device remains widely used nowadays. This paper presents, albeit non-exhaustively, circumstances and contexts that led to its invention, and its part in the worldwide (in particular in Europe) expansion of TV broadcasting via microwave radio relays and satellites. We also discuss its actual contribution to space applications and its conception. The originality of this paper comes from the wide period covered (from first slow-wave structures in 1889 to present space projects) and from connection points made between this device and commercial exploitations. The appendix deals with an intuitive pedagogical description of the wave–particle interaction.
• Editor link: https://link.springer.com/article/10.1140/epjh/e2018-90023-1
• Preprint: https://hal.archives-ouvertes.fr/hal-01754885/document

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