Generation of broadband terahertz radiation using a backward wave oscillator and pseudospark-sourced electron beam

W. He, L. Zhang, D. Bowes, H. Yin, K. Ronald, A. D. R. Phelps, A. W. Cross

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)
183 Downloads (Pure)


This paper presents for the generation of a small size high current density pseudospark (PS) electron beam for a high frequency (0.2 THz) Backward Wave Oscillator (BWO) through a Doppler up-shift of the plasma frequency. An electron beam ∼1 mm diameter carrying a current of up to 10 A and current density of 1E8 Am􀀀2, with a sweeping voltage of 42 to 25 kV and pulse duration of 25 ns was generated from the PS discharge. This beam propagated through the rippled-wall slow wave structure of a BWO beam-wave interaction region in a plasma environment without the need for a guiding magnetic field. Plasma wave assisted beam-wave interaction resulted in broadband output over a frequency range of 186 - 202 GHz with a maximum power of 20 W.
Original languageEnglish
Article number133501
Number of pages4
JournalApplied Physics Letters
Issue number13
Publication statusPublished - 28 Sep 2015


  • broadband terahertz
  • wave oscillator
  • pseudospark
  • electron beams

Cite this