Performance of the electromagnetic pixel calorimeter prototype Epical-2
Alme, Johan; Barthel, Rene; van Bochove, Aart; Borshchov, Vyacheslav; Bosley, Robert; van den Brink, A.; Broeils, E.; Büsching, H.; Eikeland, Viljar Nilsen; Grøttvik, Ola Slettevoll; Han, Y.; van der Kolk, N.; Kim, J.; Kim, T.; Kwon, Y.; Mager, M.; Malik, Qasim Waheed; Okkinga, E.; Park, T.; Peitzmann, T.; Pliquett, F.; Protsenko, M.; Reidt, F.; van Rijk, S.; Røed, Ketil; Rogoschinski, T.; Röhrich, Dieter; Rossewij, M.; Ruis, G.; Solheim, Emilie Haugland; Tymchuk, I.; Ullaland, Kjetil; Watson, N.; Yokoyama, H.
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2023Metadata
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Original version
Journal of Instrumentation (JINST). 2023, 18, P01038. 10.1088/1748-0221/18/01/P01038Abstract
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 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.