Abstract
The MPD spectrometer at the NICA collider complex is currently under construction in Dubna. The main goal of the experiment is to obtain fundamental knowledge about the properties of hot and dense baryonic matter formed in heavy-ion collisions in the energy range of (4-11) A*GeV. Crucial detector of the MPD experiment is a large-sized barrel electromagnetic calorimeter (ECal), which (together with the tracking system) will provide unique opportunities for the measurement and identification of a wide variety of charged and neutral particles carrying information about early stages of the interactions. Important tasks related to the construction of the Shashlyk-type MPD ECal are the development, production and study of the calorimeter modules with projective geometry. To improve performance of ECal, the light collection in the modules should be optimized. We present the methods and technologies developed to increase the light yield with different types and configurations of reflectors on the end of wavelengths shifting fibers. Expected characteristics of the calorimeter in detection of photons and electrons are presented and discussed
Highlights
The Multi Purpose Detector (MPD) of the Nuclotron-based Ion Collider fAcility (NICA) in JINR (Dubna, Russia) is currently being created in order to obtain fundamental knowledge of the properties of hot and dense baryonic matter formed in heavy-ion collisions at a centre-of-mass energy range of 4-11 A*GeV and an average luminosity 1027cm−2s−1, where the critical point is suspected in the QCD phase diagram [1]
Taking into account the requirements of high energy resolution, adequate timing resolution, dense active medium with the small Moliere radius, high segmentation of ECal, reasonable price, the Shashlyk-type electromagnetic calorimeter with projective geometry has been selected for the MPD/NICA [2]
The radiation hardness requirements for ECal/PANDA experiment for proton-proton collision with average luminosity L ~ 2*1032cm−2s−1 is 10 G/year, which is 10 kRad/year. We took this value as a benchmark for ECal/MPD experiment which will work in the same energy range with average luminosity L ~ 2*1030cm−2s−1 for proton-proton collision
Summary
The Multi Purpose Detector (MPD) of the Nuclotron-based Ion Collider fAcility (NICA) in JINR (Dubna, Russia) is currently being created in order to obtain fundamental knowledge of the properties of hot and dense baryonic matter formed in heavy-ion collisions at a centre-of-mass energy range of 4-11 A*GeV and an average luminosity 1027cm−2s−1, where the critical point is suspected in the QCD phase diagram [1]. Taking into account the requirements of high energy resolution, adequate timing resolution, dense active medium with the small Moliere radius, high segmentation of ECal, reasonable price, the Shashlyk-type electromagnetic calorimeter with projective geometry has been selected for the MPD/NICA [2]. It will consist of 38400 cells (towers) organized in 25 sectors; each tower has a sandwich structure of scintillator and lead plates with 16 wavelengths shifting (WLS) fibers that penetrate the plates to collect the scintillation light.
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