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We present the research and development work of the first version of a 6*6array of silicon pad detectors, carried out in India, for the proposed forwardcalorimeter (FOCAL) as part of the ALICE collaboration upgrade program at CERN.The primary motivation is to develop a large area silicon pad array realizingthe challenging requirements of high-energy physics experiments such as lowleakage current, high breakdown voltage and evaluate its performance as anactive layer in the prototype silicon tungsten (Si-W) electromagnetic (EM)calorimeter. Towards these goals, a 36-pad silicon sensor with an individualpad size of 1 cm2 is designed on a 4-inch high resistivity N-type wafer andfabricated at Bharat Electronics Limited, Bangalore. The sensors have been usedto assemble the prototype Si-W calorimeters and were successfully tested withhigh-energy particle beams. The design and development of the large areasilicon sensor and its characterization using radioactive sources in thelaboratory and high-energy particle beams are reported in this paper.

Development and characterization of a large area silicon pad array for an electromagnetic calorimeter