Generation of powerful subnanosecond microwave pulses by intense electron bunches moving in a periodic backward wave structure in the superradiative regime

N S Ginzburg, N Y Novozhilova, I V Zotova, A S Sergeev, N Y Peskov, A D R Phelps, S M Wiggins, A W Cross, K Ronald, W He, V G Shpak, M I Yalandin, S A Shunailov, M R Ulmaskulov, V P Tarakanov

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Abstract

Experimental results of the observation of coherent stimulated radiation from subnanosecond electron bunches moving through a periodic waveguide and interacting with a backward propagating wave are presented. The subnanosecond microwave pulses in Ka and W bands were generated with repetition frequencies of up to 25 Hz. The mechanism of microwave pulse generation was associated with self-bunching, and the mutual influence of different parts of the electron pulse due to slippage of the wave with respect to the electrons; this can be interpreted as superradiance. The illumination of a panel of neon bulbs resulted in a finely structured pattern corresponding to the excitation of the TM01 mode. Observation of rf breakdown of ambient air, as well as direct measurements by hot-carrier germanium detectors, leads to an estimate of the absolute peak power as high as 60 MW for the 390-ps pulses at 38 GHz. These results are compared with numerical simulations. The initial observation of 75-GHz, 10-15-MW radiation pulses with a duration of less than 150 ps is also reported. [S1063-651X(99)00709-6].

Original languageEnglish
Pages (from-to)3297-3304
Number of pages8
JournalPhysical Review E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume60
Issue number3
DOIs
Publication statusPublished - Sep 1999

Keywords

  • superradiance
  • superradiant
  • BWO
  • electron beam
  • electron bunch
  • millimetre wave devices
  • millimeter sources
  • Ka-band
  • W-band

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