Speaker
Description
Present high energy physics experiments require specific materials and technologies. For example the LHC high luminosity phase implies significant changes for LHCb in the upcoming upgrade 2. For the calorimetry system our main activities are concentrated on the upcoming upgrade of the electromagnetic calorimeter (ECAL), with changing the inner part of the present shashlik type modules in favor of the spaghetti type modules (SPACAL). Very inner part, with the highest expected radiation doses, is to be filled with radiation-hard crystal scintillating fibers (e.g. GAGG 1x1 mm^2 in cross-section) in pair with a Tungsten absorber, while the next region to be made of polystyrene fibers and lead-based absorber. In both cases the technology suitable for mass production is to be developed allowing precise positioning of the sensitive materials.
For the lead-based absorber the special molding technique is under development. First prototype had been produced at NUST "MISiS" (Moscow) and equipped with fibers and tested at CERN in 2021. Next prototype is being produced and to be tested this year.
For the tungsten absorber a 3D printing technique has been developed and currently available at NUST “MISiS”. First obtained samples meet the surface criterias for the experiment, and a prototype suitable for beam-tests to be produced soon.
Tungsten 3D printing allows various alternative applications. Currently, research is conducted on the special 3D printed anti-scattering tungsten grating – an object for the X Ray imaging, aimed to reduce background from the scattered photons. A first prototype sample with 150 um walls and with size 303030 mm^3 produced and tested.
