Author:
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.
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 × 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.
Subject
Mathematical Physics,Instrumentation
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