Abstract
We report on three LYSO crystal batches characterized at the Caltech crystal laboratory for future HEP experiments: Twenty-five 20 cm long crystals for the SuperB experiment; twelve 13 cm long crystals for the Mu2e experiment and 623 14×14×1.5 mm plates with five holes for a LYSO/W Shashlik matrix for a beam test at Fermilab. Optical and scintillation properties measured are longitudinal Transmittance, light output and FWHM energy resolution. Correlations between these properties are also investigated.
Highlights
Because of their high density (7.4 g/cm3), short radiation length (1.14 cm), fast (40 ns) and bright (4 times BGO) scintillation, cerium doped lutetium oxyorthosilicate (Lu2SiO5:Ce, LSO) [1] and lutetium yttrium oxyorthosilicate (Lu2(1−x)Y2xSiO5:Ce, LYSO) [2,3] crystals have attracted a broad interest in the high energy physics community pursuing precision electromagnetic calorimeter for future high energy physics experiments [4,5,6,7,8]
Summary Long LYSO crystals produced in industry show good transmittance exceeding 75% specification at 420 nm and good FWHM energy resolution better than 12.5% specification at 511 keV
Typical light output (LO) spread is at a level of 6% for long crystals, which may be reduced to about 3% in mass production
Summary
Because of their high density (7.4 g/cm3), short radiation length (1.14 cm), fast (40 ns) and bright (4 times BGO) scintillation, cerium doped lutetium oxyorthosilicate (Lu2SiO5:Ce, LSO) [1] and lutetium yttrium oxyorthosilicate (Lu2(1−x)Y2xSiO5:Ce, LYSO) [2,3] crystals have attracted a broad interest in the high energy physics community pursuing precision electromagnetic calorimeter for future high energy physics experiments [4,5,6,7,8]. They were grown by Czochralski method at Saint-Gobain (SG) Corporation, Shanghai Institute of Ceramics (SIC) and Sichuan Institute of Piezoelectric and Acousto-optic Technology (SIPAT). In the LO measurement for long crystals the large (tapered crystals) or one (rectangular and hexagonal crystals) end of the crystals was coupled to the PMT with Dow Corning 200 fluid, while all other faces of the crystal were wrapped with Tyvek paper. The systematic uncertainty in repeated measurements is less than 1%
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