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Production of short microwave pulses with a peak power exceeding the driving electron beam power

Published online by Cambridge University Press:  21 August 2003

ANTON A. ELTCHANINOV
Affiliation:
Institute of High Current Electronics, Siberian Division, Russian Academy of Sciences, Tomsk, Russia
SERGEI D. KOROVIN
Affiliation:
Institute of High Current Electronics, Siberian Division, Russian Academy of Sciences, Tomsk, Russia
VLADISLAV V. ROSTOV
Affiliation:
Institute of High Current Electronics, Siberian Division, Russian Academy of Sciences, Tomsk, Russia
IGOR V. PEGEL
Affiliation:
Institute of High Current Electronics, Siberian Division, Russian Academy of Sciences, Tomsk, Russia
GENNADY A. MESYATS
Affiliation:
Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Ekaterinburg, Russia
SERGEI N. RUKIN
Affiliation:
Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Ekaterinburg, Russia
VALERY G. SHPAK
Affiliation:
Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Ekaterinburg, Russia
MICHAEL I. YALANDIN
Affiliation:
Institute of Electrophysics, Ural Division, Russian Academy of Sciences, Ekaterinburg, Russia
NAUM S. GINZBURG
Affiliation:
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia

Abstract

This article presents results of theoretical and experimental studies on the production of ultrashort (a few RF cycles duration) microwave pulses of gigawatt peak powers based on superradiance from high-current electron beams. With the Cherenkov backward-wave–electron-beam interaction in a low-dispersion slow-wave structure, microwave pulses with a peak power greater than the peak power of the driving electron beam have been produced for the first time. In an experiment using the SINUS-150 compact high-current electron accelerator, with a 2.6-kA injected beam current and a 330-kV electron energy, microwave pulses of 1.2 GW peak power and ∼0.5 ns duration (FWHM) were generated in the X-band. Production of superradiance pulses in a repetitive regime (3500 Hz) in the Ka-band has been demonstrated using a compact hybrid SOS-modulator. The effect of spatial accumulation of microwave energy in extended slow-wave structures with substantially nonuniform coupling has been demonstrated. In an experiment using the SINUS-200 compact accelerator, X-band pulses of ∼3 GW peak power and 0.6–0.7 ns width (FWHM) were produced with a power conversion efficiency of 150–180% and an energy efficiency of ∼15%.

Type
Research Article
Copyright
© 2003 Cambridge University Press

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