An Improved Shashlyk Calorimeter

Details An Improved Shashlyk Calorimeter An Improved Shashlyk Calorimeter

2007-09-28

arxiv.org/abs/0709.4514v1

Nucl.Instrum.Meth.A584:291-303,2008

Physics

Instrumentation and Detectors

29 pages, 21 figures

Scientific paper

10.1016/j.nima.2007.10.022

Shashlyk electromagnetic calorimeter modules with an energy resolution of about 3%/sqrt{E (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 sigma_E/E=(1.96+-0.1)% \oplus (2.74+-0.05)%/sqrt{E}, time resolution of sigma_T = (72+-4)/sqrt{E} \oplus (14+-2)/E (ps), where photon energy E is given in GeV units and \oplus means a quadratic summation. A punch-through inefficiency of photon detection was measured to be \epsilon = 5*10^{-5} (\Theta >5 mrad).

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