Development of Silicon Pad Sensors for a Silicon-Tungsten Calorimeter in High Energy Heavy Ion Experiment

Silicon pad sensors measuring the energy deposits of particles in calorimeter showers have been designed and fabricated for Hie silicon-tungsten calorimeter to be used in the upgraded Pioneering High Energy Nuclear Interaction Experiment heavy ion experiment. The pad sensor is all array of 4 x 4 pixels in an active area of about 6 cm x 6 cm with three surrounding guardrings The details of the design and of the fabrication process and the electrical characteristics of the sensors are discussed, including the test result obtained with a high-energy beam.