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Published February 2014 | public
Journal Article

LSO/LYSO Crystals for Calorimeters in Future HEP Experiments


Because of their high stopping power (X_0=1.14 cm), fast (τ = 40 ns) bright (4 times BGO) scintillation with small temperature coefficient (-0.2%/°C) and superb radiation hardness, LSO/LYSO crystals are chosen to construct electromagnetic calorimeters (ECAL) of total absorption nature. One critical issue for this application is the light response uniformity (LRU) of long crystal bars with tapered geometry, which is affected by the non-uniform light yield along the crystal, the self-absorption and the optical focusing effect. Following a ray-tracing simulation study, an uniformization method was developed by roughening one side surface with LRU of better than 3% achieved. LSO/LYSO crystals are also proposed as the active material for a sampling ECAL for future HEP experiments in severe radiation environment. Preliminary designs with Pb or W absorber are described. Measurements of light collection efficiency (LCE) for prototype Shashlik cells with wavelength shifting fiber readout are presented. Future development on LSO/LYSO crystal based sampling ECAL is discussed.

Additional Information

© 2014 IEEE. Manuscript received May 24, 2013; revised August 09, 2013; accepted August 26, 2013. Date of publication October 17, 2013; date of current version February 06, 2014. This work was supported in part by the U.S. Department of Energy under Grant DE-FG03-92-ER-40701. The authors would like to thank the LSO/LYSO crystal producers and colleagues from the SuperB, Mu2e and CMS experiments for many useful discussions.

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