Matter and Radiation at Extremes, Volume. 7, Issue 2, 026901(2022)
Emission of fused silica and KBr samples in the UV and visible spectral ranges under irradiation with 2.7 MeV electrons
Fig. 1. Experimental schemes: (a) measurement of radiation time domain characteristics of the samples using a silicon photomultiplier (SiPM); (b) determination of the radiation spectra of the samples; (c) determination of the spatial distribution of optical emission of the samples. Key: 1, microtron; 2, collimating diaphragm; 3, sample; 4, SiPM; 5, optical fiber; 6, collecting lens; 7, spectrometer; 8, webcam.
Fig. 2. GEANT4 simulation of the penetration of an electron beam into a fused silica plate of thickness 5.5 mm. The trajectories of 50 electrons are shown. The space between the diaphragm and the plate is filled with air at atmospheric pressure.
Fig. 3. (a) Energy distribution of the electrons of the beam at different depths of its penetration into fused silica (indicated in millimeters). The spread in energies at a target thickness of 0 mm is determined by electron beam scattering in an air layer of thickness 40 mm. (b) Angular distribution of the electrons normalized to unity at different depths of beam penetration into fused silica.
Fig. 4. Normalized waveforms of the electron beam current
Fig. 5. (a) Experimental radiation spectrum of a KU-1 fused silica plate with a thickness of 8 mm and the CR calculated spectrum. (b) Radiation spectrum of a KBr plate with a thickness of 4 mm (curve 1), calculated CR spectrum (curve 2), and spectral transmittance of a KBr plate (curve 3). The integration time of the spectrometer for the experimental KU-1 spectrum was 30 s, while for the experimental KBr spectrum it was 10 s. The calculated spectrum of CR for fused silica is normalized to the value of the KU-1 energy spectral density of the radiation of the plate at a wavelength of 375 nm, while for KBr it is normalized to the value of the KBr energy spectral density of the radiation of the plate at a wavelength of 300 nm.
Fig. 6. (a) Experimental radiation spectra of a GE012 fused silica plate with a thickness of 2.18 mm for angles
Fig. 7. Photographs of (a) the uncollimated electron beam footprint on borosilicate glass of thickness
Fig. 8. Footprint of a diaphragmed electron beam on a KBr sample in transmitted daylight, together with graphs of the integral absorption coefficient of daylight (in arbitrary units), which characterize the distribution of the density of radiation-induced color centers in the sample in the vertical and horizontal directions passing through the center of the footprint. The distance from the collimating diaphragm to the target was 30 mm, the beam irradiation time was 15 min, and the time from irradiation to the time at which the footprint was taken was 10 min. The angle
Fig. 9. Photographs of the optical emission of KU-1 samples [the experimental scheme is shown in
Fig. 10. Radiation energy of a KU-1 fused silica plate with a thickness of 8 mm in the spectral range of 300–800 nm for a collimated electron beam, together with the calculated radiation energy in the same spectral range under similar conditions of electron beam irradiation of fused silica plates with thicknesses of 8 and 2.18 mm for different values of the angle
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E. Kh. Baksht, B. A. Alekseev, A. G. Burachenko, A. V. Vukolov, A. P. Potylitsyn, V. F. Tarasenko, S. R. Uglov, M. V. Shevelev. Emission of fused silica and KBr samples in the UV and visible spectral ranges under irradiation with 2.7 MeV electrons[J]. Matter and Radiation at Extremes, 2022, 7(2): 026901
Category: Radiation and Hydrodynamics
Received: Jun. 24, 2021
Accepted: Nov. 22, 2021
Published Online: Apr. 6, 2022
The Author Email: Baksht E. Kh. (beh@loi.hcei.tsc.ru)