Beam test of n-type Silicon pad array detector at PS CERN

This work reports the testing of a Forward Calorimeter (FoCal) prototype based on an n-type Si pad array detector at the CERN PS accelerator. The FoCal is a proposed upgrade in the ALICE detector operating within the pseudorapidity range of 3.2 < η < 5.8. It aims to measure direct photons, neutral hadrons, vector mesons, and jets for the study of gluon saturation effects in the unexplored region of low momentum fraction x (∼10^-5 - 10^-6). The prototype is a 8×9 n-type Si pad array detector with each pad occupying one cm^2 area, fabricated on a 6-in, 325 ± 10 μm thick, and high-resistivity (∼7 kΩ cm) Si wafer which is readout using HGCROCv2 chip. The detector is tested using pion beams of energy 10 GeV and electron beams of energy 1-5 GeV. The measurements of the Minimum Ionizing Particle (MIP) response of pions and the shower profiles of electrons are reported.