Abstract
Fused silica and KBr samples were irradiated with a 2.7 MeV electron beam. The emission of fused silica and KBr samples in the UV and visible regions was studied under various experimental conditions. Numerical simulation of optical emission was carried out using the GEANT4 computer platform. Simulations of energy spectra and angular distributions of the beam electrons were performed for different target thicknesses. The results reveal the effect of scattering of the beam electrons on the angular distribution of Cherenkov radiation in fused silica samples with thicknesses exceeding the electron path length.
Highlights
Cherenkov radiation (CR) is an important tool used in highenergy physics to detect and study both individual charged particles and their beams
The results reveal the effect of scattering of the beam electrons on the angular distribution of Cherenkov radiation in fused silica samples with thicknesses exceeding the electron path length
The rootmean-square deviation of the angular distribution of the electron beam of the accelerator after extraction behind the foil was σe 6°, and when a collimating diaphragm made of lead with a hole diameter of 5 mm was installed [(2) in Fig. 1], it decreased to σe 3.4°
Summary
Cherenkov radiation (CR) is an important tool used in highenergy physics to detect and study both individual charged particles and their beams. It is produced when charged particles move at a speed exceeding the phase speed of light in a medium. CR has the following main properties: 1. CR has a threshold nature (in terms of particle speed). 3. CR has a pronounced directionality: it spreads at a certain angle θCh arccos(c/vn) to the direction of motion direction of the charged particles, where c is the speed of light, v is the speed of the particle, and n is the refractive index of the medium.
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