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

Потылицын, А. П.; Kube, G.; Novokshonov, Artem; Vukolov, A. V.; Gogolev, S.Yu.; Alexeev, B.A.; Klag, P.; Lauth, W.

doi:10.1016/j.physleta.2021.127680

Cited by 10 publications

(10 citation statements)

References 33 publications

(41 reference statements)

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“…where dΩ = sin θdθdφ is the solid angle element, u = β 0 sin θ cos φ + iσ with σ given by (18). The angles θ m (ν), defined by…”

Section: Smith-purcell Radiation From Surface Wavesmentioning

confidence: 99%

“…Note that the properties of Cherenkov radiation emitted into vacuum from a tilted plate has been investigated recently in [16,17,18] both theoretically and experimentally. In particular, the experimental results obtained in [18] for optical Cherenkov radiation from the quartz plate show a satisfactory agreement with a theoretical model based on polarization currents approach. The dispersion relation for Cherenkov radiation has been also confirmed.…”

Section: Introductionmentioning

confidence: 99%

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Radiation processes on acoustic superlattices

Saharian,

Grigoryan,

Khachatryan

et al. 2023

J. Phys.: Conf. Ser.

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We describe several radiation processes in media excited by volume and surface acoustic waves. They include the Cherenkov and transition radiations on acoustic superlattices, transition radiation on an interface with a dynamical periodic structure, the Smith-Purcell radiation on surface waves, bremsstrahlung of high-energy electrons and the creation of electron-positron pairs by high energy photons in crystals in the presence of hypersonic waves. The conditions on the parameters of acoustic fields are specified under which their influence is essential. All these considerations show that the acoustic waves can serve as an efficient mechanism to control the parameters of various kinds of radiation processes.

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“…where dΩ = sin θdθdφ is the solid angle element, u = β 0 sin θ cos φ + iσ with σ given by (18). The angles θ m (ν), defined by…”

Section: Smith-purcell Radiation From Surface Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiation processes on acoustic superlattices

Saharian,

Grigoryan,

Khachatryan

et al. 2023

J. Phys.: Conf. Ser.

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“…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%

“…Although the ChR is widely used, only recently was proposed and experimentally confirmed to detect it as quasi-monochromatic peaks [1] instead of the typical broad spectrum. To achieve that, one must use materials with frequency dependence, e.g., quartz, as in the given experiment.…”

Section: Introductionmentioning

confidence: 99%

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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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