Azimuthal asymmetry of coherent Cherenkov radiation from a tilted bunch

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Abstract

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
Volume383
Issue number9
DOIs
Publication statusPublished - 28 Feb 2019

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coherent radiation
asymmetry
radiators
charge distribution
refraction
accelerators
angular distribution
electron beams
polarization

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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title = "Azimuthal asymmetry of coherent Cherenkov radiation from a tilted bunch",
abstract = "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.",
keywords = "Azimuthal asymmetry, Cherenkov radiation, Coherent radiation, Terahertz radiation, Tilted bunch, Transition radiation",
author = "Gogolev, {S. Yu} and Potylitsyn, {A. P.}",
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TY - JOUR

T1 - Azimuthal asymmetry of coherent Cherenkov radiation from a tilted bunch

AU - Gogolev, S. Yu

AU - Potylitsyn, A. P.

PY - 2019/2/28

Y1 - 2019/2/28

N2 - 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.

AB - 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.

KW - Azimuthal asymmetry

KW - Cherenkov radiation

KW - Coherent radiation

KW - Terahertz radiation

KW - Tilted bunch

KW - Transition radiation

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