A Large-Scale Pad-Sensor Based Prototype of the Silicon Tungsten Electromagnetic Calorimeter for the Forward Direction in ALICE at LHC
arxiv(2023)
摘要
We constructed a large-scale electromagnetic calorimeter prototype as a part
of the Forward Calorimeter upgrade project (FoCal) for the ALICE experiment at
the Large Hadron Collider (LHC). The prototype, also known as “Mini FoCal”,
consists of 20 layers of silicon pad sensors and tungsten alloy plates with
printed circuit boards and readout electronics. The constructed detector was
tested at the test beam facility of the Super Proton Synchrotron (SPS) at CERN.
We obtain an energy resolution of about 4.3
250 GeV/c, which is consistent with realistic detector response simulations.
Longitudinal profiles of electromagnetic shower were also measured and found to
agree with the simulations. The same prototype detector was installed in the
ALICE experimental area about 7.5m away from the interaction point. It was used
to measure inclusive electromagnetic cluster energy distributions and
neutral-pion candidate invariant mass distributions for pseudo-rapidity of
η=3.7-4.5 in proton-proton collisions at √(s) = 13 TeV at LHC. The
measured distributions in different η regions are similar to those
obtained from PYTHIA simulations.
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