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

Abstract

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 < $\eta$ < 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 ($\sim 10^{-5}-10^{-6}$). The prototype is a $8\times 9$ n-type Si pad array detector with each pad occupying one cm${}^2$ area, fabricated on a 6-in, 325~$\pm 10\mu$m thick, and high-resistivity ($\sim$7 k$\Omega$ 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.

14 pages, 13 figures