Additive manufacturing of inorganic scintillator-based particle detectors

Inorganic scintillators are widely used for scientific, industrial and medical applications. The development of 3D printing with inorganic scintillators would allow fast creation of detector prototypes for registration of ionizing radiation, such as alpha and beta, gamma particles in thin layers of active material and soft X-ray radiation. This article reports on the technical work and scientific achievements that aimed at developing a new inorganic scintillation filament to be used for the 3D printing of composite scintillator materials: study and definition of the scintillator composition; development of the methods for the inorganic scintillator filament production and further implementation in the available 3D printing technologies; study of impact of the different 3D printing modes on the material scintillation characteristics. Also, 3D printed scintillators can be used for creation of combined detectors for high-energy physics.Comment: 14 pages, 16 figure

The LHCb upgrade I

The LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software

Radioluminescence of color centers in LiF crystals

Luminescence of color centers in the near-infrared region under cathode beam excitation is revealed for the first time in as-grown pure LiF and LiF:Mg,O crystals. Emission efficiency of View the MathML sourceF2+, View the MathML sourceF3− and View the MathML sourceF2−centers is higher for the samples enriched by oxygen and magnesium than for ultrapure crystals. The intensity of the NIR luminescence remains practically constant with the increase of the electron beam density. In contrast, visible emission typical for View the MathML sourceF3+and F2 centers is suppressed due to the induced absorption bands. It is assumed that the high-density electronic irradiation leads to the strongly pronounced thermal- and radiation-stimulated diffusion in a relatively thin layer. It causes the association of point radiation defects with the formation of various complex centers and aggregates. Results obtained suggest that LiF crystals can be used for in-situ detection of ionizing radiation

ZnWO₄ luminescent films obtained by hydrothermal method

ZnWO₄ films of 10–20 μm thickness can be produced by hydrothermal synthesis method without additional subsequent treatment. The data obtained show that films possess wolframite structure and demonstrate luminescent properties which are similar to bulk ZnWO₄

Growth and luminescent properties of new Eu 2+^{2+} doped RbBa2_{2}I5_{5} scintillator

A novel crystal scintillator of RbBa$_{2}$I$_{5}$:Eu$^{2+}$ was grown by the Bridgman–Stockbarger method. Its luminescence and scintillation properties were investigated. Under X-ray excitation, the crystal demonstrates blue luminescence peaking at 436 nm associated with 4f$^{6}$5d$^{1}$ → 4f$^{7}$ radiative transitions of Eu$^{2+}$ ions. The main X-ray luminescence decay constant is 800 ns. The light output of RbBa$_{2}$I$_{5}$:3%Eu$^{2+}$ sample under 662 keV excitation is 58,200 ph/MeV

ZnWO4_4 grains characterisation for GRAiNITA – a new-generation calorimeter

International audienc

Fast ultradense GdTa1-xNbxO4 scintillator crystals

International audienc

ZnWO4_4 grains characterisation for GRAiNITA – a new-generation calorimeter

International audienc