Generation of powerful ultrashort electromagnetic pulses based on superradiance

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

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Experimental results of the observation of superradiation from intense, subnanosecond electron bunches moving through a periodic waveguide and interacting with a backward propagating TM01 wave are presented. The ultra-short microwave pulses in Ka, W, and G band were generated with repetition frequencies of up to 25 Hz. Observation of RF breakdown of ambient air, as well as direct measurements by hot-carrier germanium detectors, leads to an estimate of the peak power as high as 60-120 MW for the 300-400 ps pulses at 38 GHz. The initial observation of 75 GHz 10-15 MW radiation pulses with duration less than 150 ps, and of 150 GHz microwave spikes with a risetime of 75ps are also reported. Comparison with simulations is discussed as well. 

Original languageEnglish
Pages (from-to)385-390
Number of pages6
JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume475
Issue number1-3
DOIs
Publication statusPublished - 21 Dec 2001

Keywords

  • Cherenkov emission
  • superradiance
  • electron bunch
  • electron bunches
  • BWO
  • millimetre wave devices
  • electrical breakdown
  • microwave generation

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