Response of a CMS HGCAL silicon-pad electromagnetic calorimeter prototype to 20-300 GeV positrons
Creators: name: Acar, B.
name: Adamov, G.
name: Adloff, C.
name: Afanasiev, S.
name: Akchurin, N.
name: Akgün, B.
name: Khan, F. Alam
name: Alhusseini, M.
name: Alison, J.
name: Alpana, A.
name: Altopp, G.
name: Alyari, M.
name: An, S.
name: Anagul, S.
name: Andreev, I.
name: Aspell, P.
name: Atakisi, I. O.
name: Bach, O.
name: Baden, A.
name: Bakas, G.
name: Bakshi, A.
name: Bargassa, P.
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name: Beaudette, F.
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name: Becker, A.
name: Behera, P.
name: Belloni, A.
name: Bergauer, T.
name: Besancon, M.
name: Bhattacharya, S.
name: Bhowmik, D.
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name: Bonnemaison, A.
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name: Charitonidis, N.
name: Chatterjee, R.
name: Chen, Y. M.
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name: Chernichenko, S.
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name: Chien, C. H.
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name: Yeh, C. H.
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name: Yu, G. B.
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Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2021
Subjects: calorimeter: electromagnetic
CMS
energy resolution
angular resolution
semiconductor detector
spatial resolution
detector: design
electronics: readout
irradiation
performance

description: CMS is designing a new high-granularity endcap calorimeter, HGCAL, to be installed later this decade. As part of this development work, a prototype system was extensively tested with beams at CERN's SPS in 2018. The electromagnetic section of the detector called CE-E prototype, consists of 14 double-sided structures, providing 28 sampling layers. Each layer carries a hexagonal module where a multi-pad large area silicon sensor is glued between the electronics PCB and a metal baseplate. The sensor pads of approximately 1 cm$^2$ are wire-bonded to the PCB and are readout by the Skiroc2-CMS ASIC. The prototype has been exposed to beams of positrons with energies ranging from 20 to 300 GeV. Based on these data, measurements of the CE-E prototype energy resolution and linearity, position resolution, resolution on the positron angle of incidence derived from the shower axis reconstruction and shower shapes are presented and compared to detailed GEANT4 simulations.