The generation of runaway electrons(REs)is a significant problem in tokamak installations,causing energy loss,and melting and vaporization of the walls of the vacuum chamber.The wide deployment of Cherenkov-type detec...The generation of runaway electrons(REs)is a significant problem in tokamak installations,causing energy loss,and melting and vaporization of the walls of the vacuum chamber.The wide deployment of Cherenkov-type detectors,in addition to other methods,is routinely used to detect high-energy electrons.This paper focuses on the cathodoluminescence and Cherenkov radiation excited in different crystals by REs.The spectral energy density of Cherenkov radiation in CaF_(2)(fluorite)and diamond at various initial electron energies is calculated,taking into account the ionization losses of electron energy,the dispersion of the refractive index of these substances,and the electron energy distribution of the beam.展开更多
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 simulati...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.展开更多
文摘The generation of runaway electrons(REs)is a significant problem in tokamak installations,causing energy loss,and melting and vaporization of the walls of the vacuum chamber.The wide deployment of Cherenkov-type detectors,in addition to other methods,is routinely used to detect high-energy electrons.This paper focuses on the cathodoluminescence and Cherenkov radiation excited in different crystals by REs.The spectral energy density of Cherenkov radiation in CaF_(2)(fluorite)and diamond at various initial electron energies is calculated,taking into account the ionization losses of electron energy,the dispersion of the refractive index of these substances,and the electron energy distribution of the beam.
基金This work was supported by the Ministry of Science and Higher Education of the Russian Federation(Grant Nos.FWRM-2021-0014 and FSWW-2020-0008)。
文摘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.
