Fabrication and beam test of a silicon-tungsten electromagnetic calorimeter

• Main Authors: Muhuri, Sanjib, Mukhopadhyay, Sourav, Chandratre, Vinay B, Nayak, Tapan K, Saha, Sumit Kumar, Thakur, Sanchari, Singaraju, Rama N, Saini, Jogender, Brink, Anthony van den, Chujo, Tatsuya, Patra, Rajendra Nath, van Leeuwen, Marco, Khan, Shuaib Ahmad, Sukhwani, Menka, Nooren, Gert-Jan, Peitzmann, Thomas
• Format: Journal Article
• Language: English
• Published: 14-01-2020
• Subjects: Physics - High Energy Physics - Experiment; Physics - Instrumentation and Detectors; Physics - Nuclear Experiment
• DOI: 10.48550/arxiv.1911.00743

A silicon-tungsten (Si-W) sampling calorimeter, consisting of 19 alternate
layers of silicon pad detectors (individual pad area of 1~cm$^2$) and tungsten
absorbers (each of one radiation length), has been constructed for measurement
of electromagnetic showers over a large energy range. The signal from each of
the silicon pads is readout using an ASIC with a dynamic range from $-300$~fC
to $+500$~fC. Another ASIC with a larger dynamic range, $\pm 600$~fC has been
used as a test study. The calorimeter was exposed to pion and electron beams at
the CERN Super Proton Synchrotron (SPS) to characterise the response to minimum
ionising particles (MIP) and showers from electromagnetic (EM) interactions.
Pion beams of 120 GeV provided baseline measurements towards the understanding
of the MIP behaviour in the silicon pad layers, while electron beams of energy
from 5 GeV to 60 GeV rendered detailed shower profiles within the calorimeter.
The energy deposition in each layer, the longitudinal shower profile, and the
total energy deposition have been measured for each incident electron energy.
Linear behaviour of the total measured energy ($E$) with that of the incident
particle energy ($E_{0}$) ensured satisfactory calorimetric performance. For a
subset of the data sample, selected based on the cluster position of the
electromagnetic shower of the incident electron, the dependence of the measured
energy resolution on $E_{0}$ has been found to be $\sigma/E =
(15.36/\sqrt{E_0(\mathrm{GeV)}} \oplus 2.0) \%$.