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

Abstract We present the research and development work of first version a 6×6 array silicon pad detectors, carried out in India, for proposed forward calorimeter (FOCAL) as part ALICE collaboration upgrade program at CERN. The primary motivation is to develop large area realizing challenging requirements high-energy physics experiments such low leakage current, high breakdown voltage evaluate its performance an active layer prototype tungsten (Si-W) electromagnetic (EM) calorimeter. Towards these goals, 36-pad sensor with individual size ∼1 cm 2 designed on 4-inch resistivity N-type wafer fabricated Bharat Electronics Limited, Bangalore. sensors have been used assemble Si-W calorimeters were successfully tested particle beams. design characterization using radioactive sources laboratory beams are reported this paper.