Azimuthal asymmetry of coherent Cherenkov radiation from a tilted bunch

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Modern accelerator technologies may provide electron beams consisting of ultrashort bunches with transverse sizes, which are much larger than longitudinal sizes. The spectral-angular characteristics of coherent Cherenkov radiation (CChR) produced by such bunches have thus been considered. We simulated the characteristics of CChR and those from a single charge on the basis of the polarization current model, which allowed us to consider finite sizes for the Cherenkov radiator. We calculated the angular distribution of the CChR from a bunch tilted by angle ψ with respect to the velocity direction, with the assumption of a 3-D Gaussian charge distribution in the bunch. Contrary to the azimuthally symmetrical distribution of conventional ChR, a strong azimuthal asymmetry was observed in the CChR from the tilted bunch. The maximal yield of the CChR may be achieved if the tilt angle ψ coincides with the Cherenkov angle Θ ch =arccos⁡(1/nβ), βc is the charge velocity and n is the refraction index.

Original languageEnglish
Pages (from-to)888-893
Number of pages6
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number9
Publication statusPublished - 28 Feb 2019


  • Azimuthal asymmetry
  • Cherenkov radiation
  • Coherent radiation
  • Terahertz radiation
  • Tilted bunch
  • Transition radiation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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