An Improved Shashlyk Calorimeter
Abstract
Shashlyk electromagnetic calorimeter modules with an energy resolution of about 3%/sqrtE (GeV) for 50-1000 MeV photons has been developed, and a prototype tested. Details of these improved modules, including mechanical construction, selection of wave shifting fibers and photo-detectors, and development of a new scintillator with improved optical and mechanical properties are described. How the modules will perform in a large calorimeter was determined from prototype measurements. The experimentally determined characteristics of the calorimeter prototype show energy resolution of sigmaE/E=(1.96+-0.1)% (2.74+-0.05)%/sqrtE, time resolution of sigmaT = (72+-4)/sqrtE (14+-2)/E (ps), where photon energy E is given in GeV units and means a quadratic summation. A punch-through inefficiency of photon detection was measured to be ε = 5*10-5 ( >5 mrad).
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