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A silicon-tungsten (Si-W) sampling calorimeter, consisting of 19 alternatelayers of silicon pad detectors (individual pad area of 1~cm$^2$) and tungstenabsorbers (each of one radiation length), has been constructed for measurementof electromagnetic showers over a large energy range. The signal from each ofthe silicon pads is readout using an ASIC with a dynamic range from $-300$~fCto $+500$~fC. Another ASIC with a larger dynamic range, $\pm 600$~fC has beenused as a test study. The calorimeter was exposed to pion and electron beams atthe CERN Super Proton Synchrotron (SPS) to characterise the response to minimumionising particles (MIP) and showers from electromagnetic (EM) interactions.Pion beams of 120 GeV provided baseline measurements towards the understandingof the MIP behaviour in the silicon pad layers, while electron beams of energyfrom 5 GeV to 60 GeV rendered detailed shower profiles within the calorimeter.The energy deposition in each layer, the longitudinal shower profile, and thetotal energy deposition have been measured for each incident electron energy.Linear behaviour of the total measured energy ($E$) with that of the incidentparticle energy ($E_{0}$) ensured satisfactory calorimetric performance. For asubset of the data sample, selected based on the cluster position of theelectromagnetic shower of the incident electron, the dependence of the measuredenergy resolution on $E_{0}$ has been found to be $\sigma/E =(15.36/\sqrt{E_0(\mathrm{GeV)}} \oplus 2.0) \%$.

Fabrication and beam test of a silicon-tungsten electromagnetic calorimeter