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Development of high-power and portable sources of coherent electromagnetic radiation operating at sub-THz (0.1–0.3 THz) frequency band is important for many scientific and industrial applications. Among such sources, devices with pseudospark (PS) electron beam have attracted interest since they are capable of producing high power and do not require an external magnetic field to confine the electron beam. In this article, we present the results of development of the W-band backward-wave oscillator (BWO) driven by a self-focused PS sheet electron beam. The high-frequency interaction structure based on the staggered dual grating slow-wave structure (SDG SWS) is designed and simulated using CST Studio. The SWS provides wide bandwidth and high Pierce interaction impedance at the backward spatial harmonic. Then, interaction of the plasma focused high-current-density electron beam with electromagnetic wave in the SWS is simulated using the time-domain 3-D particle-in-cell CST Particle Studio simulator. The PS-based hollow-cathode electron source providing a 6.3-A, 30-kV sheet electron beam is developed and experimentally tested. Fabrication issues of the SWS by using computer-numerical-control (CNC) nano-machining are discussed. The interaction structure is fabricated and assembled.

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Development and Modeling of the Plasma-Assisted Sub-THz Backward-Wave Oscillator

  • 会议论文

  • 发表日期：

    2025年

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  • Nikita M. Ryskin,
  • Vladimir N. Titov,
  • Roman A. Torgashov,
  • Prerna Unadkat,
  • Vishant,
  • Anand Abhishek,
  • Sahil Jain,
  • Niraj Kumar

摘要

Development of high-power and portable sources of coherent electromagnetic radiation operating at sub-THz (0.1–0.3 THz) frequency band is important for many scientific and industrial applications. Among such sources, devices with pseudospark (PS) electron beam have attracted interest since they are capable of producing high power and do not require an external magnetic field to confine the electron beam. In this article, we present the results of development of the W-band backward-wave oscillator (BWO) driven by a self-focused PS sheet electron beam. The high-frequency interaction structure based on the staggered dual grating slow-wave structure (SDG SWS) is designed and simulated using CST Studio. The SWS provides wide bandwidth and high Pierce interaction impedance at the backward spatial harmonic. Then, interaction of the plasma focused high-current-density electron beam with electromagnetic wave in the SWS is simulated using the time-domain 3-D particle-in-cell CST Particle Studio simulator. The PS-based hollow-cathode electron source providing a 6.3-A, 30-kV sheet electron beam is developed and experimentally tested. Fabrication issues of the SWS by using computer-numerical-control (CNC) nano-machining are discussed. The interaction structure is fabricated and assembled.