Vavilov–Cherenkov Radiation in an Inclined Dielectric Plate and Violation of Azimuthal Symmetry

Потылицын, А. П.; Gogolev, S.Yu.

doi:10.1134/s1547477119020110

Cited by 16 publications

(6 citation statements)

References 10 publications

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“…Ref. [21]. The polar and azimuthal angles θ, ϕ, the particle velocity components β y,z , and the direction cosines n x,y,z of the outgoing ChR are expressed in the right-handed Cartesian coordinate system (x, y, z) which is related to the target boundary normal, see Fig.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…For this plane geometry, the relation connecting the outgoing photon angle θ vac and the target tilt angle ψ is determined by the following equation [19,21]: Eq. ( 3) is a consequence of the refraction at the boundary surface described by Snell's law, sin θ = n sin(θ ch −ψ), and the referencing with respect to the particle beam axis, i.e.…”

Section: Introductionmentioning

confidence: 99%

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First observation of quasi–monochromatic optical Cherenkov radiation in a dispersive medium (quartz)

et al. 2021

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Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First observation of quasi–monochromatic optical Cherenkov radiation in a dispersive medium (quartz)

et al. 2021

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“…To prevent the reflection of photons at the quartz-air boundary, this target is inclined at an angle ψ = 40 • (see figure 4a) and photons can leave this target. Escaping angle with maximal intensity is defined, as [16] θ max = ψ + arcsin n sin arccos…”

Section: Model Of Geant4mentioning

confidence: 99%

Runaway electron energy determination by angular distribution of Cherenkov radiation

et al. 2020

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In this paper, we want to show how to obtain information about the spectrum of runaway electrons with kinetic energy in the range T≈ 0.25–2 MeV using Cherenkov radiation (ChR). We use a quartz target as a radiator which is tilted so that the generated Cherenkov optical photons can leave it. Electrons are light charged particles and such process as multiple scattering has a significant influence on ChR angular distribution since it can blur angular distribution of ChR. In spite of this fact, information about the runaway kinetic energy can be obtained by deconvolving ChR angular distribution.

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“…The broadening predicted in equation ( 3) is a consequence of the ChR wave nature and is observable unless the condition 𝜆 ≪ 𝐿 is satisfied. In our previous analyses, we used another wave nature-based model to describe resultsthe polarization currents model [2,16,17]. For instance, that model gave good results compared to the experiment, even though pencil-like electron beams were considered [1].…”

Section: Introductionmentioning

confidence: 99%

Geant4 simulations of monochromatic Cherenkov radiation in thin quartz targets for different experimental conditions

Đurnić,

Potylitsyn,

Bogdanov

et al. 2024

J. Phys.: Conf. Ser.

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In light of our recent research, we discussed the possibility of observing quasimonochromatic Cherenkov Radiation (ChR) spectral lines from a dispersive medium (thin quartz radiator). Such experimental results were verified on the Mainz Microtron MAMI, Germany [1], while both the polarization currents analytical model [2] and Geant4 [3] simulations were used to analyze the results. To describe the Cherenkov radiation process, the Geant4 toolkit uses only the approximation obtainable for an infinitely thick emitter (cos θ = 1 / βn(λ), where θ is Cherenkov’s angle of emission, β is reduced velocity, and n(λ) is a refractive index as a function of emitted radiation’s wavelength λ) and doesn’t consider its actual dimensions. Tamm’s theory [4] predicts some broadening of the ChR angular distribution with a radiator thinning. Consequently, Geant4 gave inadequate results for the pencil-like electron beams compared to the polarization currents model and the experiment. However, unlike in the analytical calculations, we needed to consider more realistic Gaussian electron beams to obtain better results with Geant4. Therefore, obtained results primarily manifest beam characteristics rather than the ChR itself, i.e., its intrinsic characteristics are masked. Now, the idea is to present additional simulation results with further variations of the quartz’s thickness (in preparation for future experiments), confirming the last conclusion without any doubt.

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Vavilov–Cherenkov Radiation in an Inclined Dielectric Plate and Violation of Azimuthal Symmetry

Cited by 16 publications

References 10 publications

First observation of quasi–monochromatic optical Cherenkov radiation in a dispersive medium (quartz)

First observation of quasi–monochromatic optical Cherenkov radiation in a dispersive medium (quartz)

Runaway electron energy determination by angular distribution of Cherenkov radiation

Geant4 simulations of monochromatic Cherenkov radiation in thin quartz targets for different experimental conditions

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