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 < \(\mathrm{\eta}\) < 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 (\(\mathrm{\sim10^{-5} - 10^{-6}}\)). The prototype is a \(\mathrm{8\times9}\) n-type Si pad array detector with each pad occupying one cm\(^2\) area, fabricated on a 6-in, 325~\(\mathrm{\pm 10 \thinspace \mu}\)m thick, and high-resistivity (\(\sim\)7 k\(\Omega \thinspace\) 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.