Construction and first beam-tests of silicon-tungsten prototype modules for the CMS high granularity calorimeter for HL-LHC

Abstract

The High Granularity Calorimeter (HGCAL) is the technology choice of the CMS collaboration for the endcap calorimetry upgrade planned to cope with the harsh radiation and pileup environment at the High-Luminosity LHC. The HGCAL is realized as a sampling calorimeter, including an electromagnetic compartment comprising 28 layers of silicon pad detectors. Prototype modules, based on hexagonal silicon pad sensors have been constructed and tested in beams at FNAL and at CERN. We present the construction and first beam-tests of these modules both in the laboratory and with beams of electrons, pions and protons, including noise performance, calibration with minimum ionizing particles, electron relative energy and position resolutions and precision-timing measurements.