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Abstract— <p>We report a study of the spectrum of the Cherenkov beam instability in a plasma dielectric waveguide. In the absence of plasma, the instability results from the induced Cherenkov radiation of many transverse slow electromagnetic modes of the waveguide. In the presence of plasma, the long-wavelength part of the spectrum is due to the excitation of a potential Langmuir wave, aperiodic self-modulation of the beam, and Cherenkov radiation of a surface plasma wave; the high-frequency part of the spectrum weakly depends on the presence of plasma in the waveguide.</p>

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Effect of Plasma on Spectra of the Cherenkov Beam Instability in a Dielectric Waveguide

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • A. V. Ershov,
  • M. V. Kuzelev

摘要

Abstract—

We report a study of the spectrum of the Cherenkov beam instability in a plasma dielectric waveguide. In the absence of plasma, the instability results from the induced Cherenkov radiation of many transverse slow electromagnetic modes of the waveguide. In the presence of plasma, the long-wavelength part of the spectrum is due to the excitation of a potential Langmuir wave, aperiodic self-modulation of the beam, and Cherenkov radiation of a surface plasma wave; the high-frequency part of the spectrum weakly depends on the presence of plasma in the waveguide.