Coherent microwave generation from a pseudospark cathode Cherenkov maser

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Experimental results are presented from the first free electron maser experiment to use a pseudospark electron source. A pulsed, 70–80 kV, 10 A electron beam of normalized brightness 10^11A(m*rad)^(−2) and current density 1kAcm^(−2) from a pseudospark electron cathode was used to produce coherent microwave radiation via a Cherenkov interaction between the electron beam and the TM01 mode of a 60-cm-long alumina-lined waveguide. A gain of 29 dB was measured with an output power of 2 kW in the frequency range 25.5–28.6 GHz. The experimental results were found to be consistent with numerical simulations of Cherenkov amplification.
Original languageEnglish
Article number020701
Number of pages5
JournalPhysical Review Special Topics: Accelerators and Beams
Issue number2
Publication statusPublished - 17 Feb 1999


  • maser
  • Cherenkov
  • pseudospark


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