Performance of the electromagnetic pixel calorimeter prototype Epical-2. (1st January 2023)

• Record Type: Journal Article
• Authors: Alme, J.; Barthel, R.; van Bochove, A.; Borshchov, V.; Bosley, R.; van den Brink, A.; Broeils, E.; Büsching, H.; Eikeland, V.N.; Groettvik, O.S.; Han, Y.H.; van der Kolk, N.; Kim, J.H.; Kim, T.J.; Kwon, Y.; Mager, M.; Malik, Q.W.; Okkinga, E.; Park, T.Y.; Peitzmann, T.; Pliquett, F.; Protsenko, M.; Reidt, F.; van Rijk, S.; Røed, K.; Rogoschinski, T.S.; Röhrich, D.; Rossewij, M.J.; Ruis, G.B.; Solheim, E.H.; Tymchuk, I.; Ullaland, K.; Watson, N.K.; Yokoyama, H.;
• Is Part Of: Journal of instrumentation. Volume 18:Number 1(2023)
• Publication Date: 2023-01-01
• Subjects: 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); Scientific apparatus and instruments -- Periodicals; 502.84
• DOI: 10.1088/1748-0221/18/01/P01038
• Languages: English
• ISSNs: 1748-0221

Abstract

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 × 10 6 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 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 Allpix 2 . 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.