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...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2014-02, Vol.61 (1), p.483-488
Main Authors: Zhang, Liyuan, Mao, Rihua, Yang, Fang, Zhu, Ren-Yuan
Format: Article
Language:English
Subjects:
Absorption
BGO (crystal)
Cerium
Coefficients
Crystal
Crystals
emission
Focusing
Lead (metal)
light attenuation length
light output
light response uniformity (LRU)
Optical surface waves
Photonics
ray-tracing
Rough surfaces
Sampling
sampling calorimeter
Scintillation
scintillator
Shashlik
Stopping power
Surface roughness
transmittance
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Description
Summary: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.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2013.2279993