Performance of the electromagnetic pixel calorimeter prototype Epical-2
Alme, J.; Barthel, R.; van Bochove, A.; Borshchov, V.; Bosley, R.; van den Brink, A.; Broeils, E.; Büsching, H.; Eikeland, V.; Groettvik, O.; Han, Y.; van der Kolk, N.; Kim, J.; Kim, T.; Kwon, Y.; Mager, M.; Malik, Q.; Okkinga, E.; Park, T.; Peitzmann, T.; Pliquett, F.; Protsenko, M.; Reidt, F.; van Rijk, S.; Røed, K.; Rogoschinski, T.; Röhrich, D.; Rossewij, M.; Ruis, G.; Solheim, E.; Tymchuk, I.; Ullaland, K.; Watson, N.; Yokoyama, H.
(2023) Journal of Instrumentation, volume 18, issue 1
(Article)
Abstract
The first evaluation of an ultra-high granularity digital electromagnetic calorimeter prototype using 1.0-5.8 GeV/c electrons is presented. The 25 × 106 pixel detector consists of 24 layers of ALPIDE CMOS MAPS sensors, with a pitch of around 30 μm, and has a depth of almost 20 radiation lengths of tungsten
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absorber. Ultra-thin cables allow for a very compact design. The properties that are critical for physics studies are measured: electromagnetic shower response, energy resolution and linearity. The stochastic energy resolution is comparable with the state-of-the art resolution for a Si-W calorimeter, with data described well by a simulation model using Geant4 and Allpix2. The performance achieved makes this technology a good candidate for use in the ALICE FoCal upgrade, and in general demonstrates the strong potential for future applications in high-energy physics.
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Keywords: Calorimeter methods, Calorimeters, Detector design and construction technologies and materials, Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc), Instrumentation, Mathematical Physics
ISSN: 1748-0221
Publisher: IOP PUBLISHING LTD
Note: Publisher Copyright: © 2023 CERN.
(Peer reviewed)