Post on 11-Jan-2016
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PbWO crystals
Liping GanUniversity of North Carolina Wilmington
L. Gan October 31, 2008 2
Comparison of heavy crystals from A.E. Borisevish, Nucl. Exp. Tech., 49, 199 (2006)
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Light Yield Temperature Dependence Nucl. Inst. Meth., A365, 291 (1995)
d(LY)/dT is about -1.9 %/Co
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Scintillation decay curvesfrom A.M. Blick et al., Nucl. Instr.,Meth.,A390,30 (1997)
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Radiation Hardness
Protvino beam test result, Nucl.Instrum.Meth.A512:488-505,2003
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Electron Beam Irradiation
Dose rate: 10-25 rad/hour 27-GeV electron beam
Average saturated light loss of ~8% after 1-2 Krad
Recovery study shows that 85% damage can be recovered in 2 months after irradiation
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10-25 rad/hour 40-GeV pion irradiation, average ~12% light loss after ~1-2 krad total dose
30-60 rad/hour 40-GeV pion irradiation, average ~20% light loss after ~2 krad total dose
500 rad/hour by charge hadrons, γ-quanta and neutrons,
~20% light loss after ~2 krad total dose
Energy resolution is not noticeably degraded by the radiation damage
Pion Beam Irradiation
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100 krad/hour 40-GeV pion irradiation, about a factor of 3 light loss after ~2.5 Mrad total dose
Degradation of energy resolution is 20-50% after ~2.5 Mrad dose
Radiation Hardness continue----Super-intensive beam
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PrimEx PbWO4 from SIC
Specified
Size: 20.5x20.5x180 mm3
Tolerances: +0.0-0.1 in trans. +0.3-0.0 in long.
Collaboration managed to double the number of crystals: to from 650 to 1250
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PbWO4 Development:Optical Properties
Optical transparency
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PbWO4 Energy Resolution
6 x 6 crystalsE/E = 1.3 %
1 x 1
3 x 3
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PbWO4 Position Resolution
x = 1.3 mm
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Rate dependence
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Current Production and price in SIC
• Production line in SIC is still alive. They can provide 4000 modules in one year
• Price will be in the range of $2.5-$5.0
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Summary
• Excellent energy and position resolution• Compact shower Size• Fast signals• Excellent radiation hardness• 4000 modules can be delivered by SIC within 1
year• Price is in the range of $2.5-$5.0 per cc