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Poster De Conférence Année : 2022

ZnWO4 grains characterisation for GRAiNITA – a new-generation calorimeter

Résumé

We will present the detection properties of ZnWO4 grains for GRAiNITA, a next-generation calorimeter based on the use of scintillator grains. With GRAiNITA, we propose the concept of a new version of the shashlik calorimeter: instead of using successive layers of scintillator and absorber we suggest to use sub millimetric (0.5-1 mm) grains of high-Z and high-density inorganic scintillator in a bath of transparent high-density liquid, as absorber. As in a conventional shashlik detector, the scintillation light is collected towards the photodetector by means of wavelength shifting fibers. In the context of high energy physics experiments, at future electron-positron colliders, this new electromagnetic calorimeter will provide extremely fine sampling and therefore the potential to considerably improve the energy resolution for photons. ZnWO4 is an excellent candidate for GRAiNITA since transparent granules of the desired size can be successfully grown with the method of spontaneous crystallization from a flux melt. While the production process is still being optimized, a small quantity of ZnWO4 granules has already been produced by the ISMA. In this communication we will discuss the study of the scintillation properties of ZnWO4 grains, in comparison to two uniform single crystals with size of 1 cm3 and 2x2x4 cm3 that have been grown using the Czochralski method, as the light yield of an inorganic crystal might depend on the particular growing process used to produce them. Furthermore, we will present the outcomes of study of the light propagation and collection in a small volume of ZnWO4 and we will describe the GRAiNITA concept.
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Dates et versions

hal-04269276 , version 1 (03-11-2023)

Identifiants

  • HAL Id : hal-04269276 , version 1

Citer

Giulia Hull, Ianina Boiaryntseva, Jacques Lefrancois, I. Tupitsyna, A.-M. Dubovik, et al.. ZnWO4 grains characterisation for GRAiNITA – a new-generation calorimeter. IEEE Nuclear Science Symposium and Medical Imaging Conference, Nov 2022, Milan, Italy. ⟨hal-04269276⟩
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