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We constructed a large-scale electromagnetic calorimeter prototype as a partof the Forward Calorimeter upgrade project (FoCal) for the ALICE experiment atthe Large Hadron Collider (LHC). The prototype, also known as ``Mini FoCal'',consists of 20 layers of silicon pad sensors and tungsten alloy plates withprinted circuit boards and readout electronics. The constructed detector wastested at the test beam facility of the Super Proton Synchrotron (SPS) at CERN.We obtain an energy resolution of about 4.3% for electron beams at both 150 and250 GeV/$c$, which is consistent with realistic detector response simulations.Longitudinal profiles of electromagnetic shower were also measured and found toagree with the simulations. The same prototype detector was installed in theALICE experimental area about 7.5m away from the interaction point. It was usedto measure inclusive electromagnetic cluster energy distributions andneutral-pion candidate invariant mass distributions for pseudo-rapidity of$\eta$=3.7-4.5 in proton-proton collisions at $\sqrt{s}$ = 13 TeV at LHC. Themeasured distributions in different $\eta$ regions are similar to thoseobtained from PYTHIA simulations.

A Large-Scale Pad-Sensor Based Prototype of the Silicon Tungsten Electromagnetic Calorimeter for the Forward Direction in ALICE at LHC