TY - INPR A1 - Alme, Johan A1 - Barthel, Rene A1 - Bochove, Aart van A1 - Borshchov, Vyacheslav A1 - Bosley, Robert A1 - Brink, Anthony van den A1 - Broeils, Edwin A1 - Büsching, Henner A1 - Eikeland, Viljar Nilsen A1 - Grøttvik, Ola Slettevoll A1 - Han, Younghoon A1 - Kolk, Naomi van der A1 - Kim, J. H. A1 - Kim, Taejun A1 - Kwon, Youngjoon A1 - Mager, Magnus A1 - Malik, Qasim Waheed A1 - Okkinga, Else A1 - Park, T. Y. A1 - Peitzmann, Thomas A1 - Pliquett, Fabian A1 - Protsenko, Maksym A1 - Reidt, Felix A1 - Rijk, Sebastiaan van A1 - Røed, Ketil A1 - Rogoschinski, Tim Sebastian A1 - Röhrich, Dieter A1 - Rossewij, Marcel J. A1 - Ruis, G. B. A1 - Solheim, Emilie Haugland A1 - Tymchuk, Ihor A1 - Ullaland, Kjetil A1 - Watson, Nigel Keith A1 - Yokoyama, Hiroki T1 - Performance of the electromagnetic pixel calorimeter prototype Epical-2 T2 - arXiv N2 - 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 GEANT 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. Y1 - 2022 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/84973 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-849734 UR - https://arxiv.org/abs/2209.02511v2 IS - 2209.02511v2 PB - arXiv ER -