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PbWO crystals. Liping Gan University of North Carolina Wilmington. Comparison of heavy crystals from A.E. Borisevish, Nucl. Exp. Tech., 49, 199 (2006). Light Yield Temperature Dependence Nucl. Inst. Meth., A365, 291 (1995). d(LY)/dT is about -1.9 %/C o. - PowerPoint PPT Presentation
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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)
L. Gan October 31, 2008 3
Light Yield Temperature Dependence Nucl. Inst. Meth., A365, 291 (1995)
d(LY)/dT is about -1.9 %/Co
L. Gan October 31, 2008 4
Scintillation decay curvesfrom A.M. Blick et al., Nucl. Instr.,Meth.,A390,30 (1997)
L. Gan October 31, 2008 5
Radiation Hardness
Protvino beam test result, Nucl.Instrum.Meth.A512:488-505,2003
L. Gan October 31, 2008 6
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
L. Gan October 31, 2008 7
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
L. Gan October 31, 2008 8
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
L. Gan October 31, 2008 9
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
L. Gan October 31, 2008 10
PbWO4 Development:Optical Properties
Optical transparency
L. Gan October 31, 2008 11
PbWO4 Energy Resolution
6 x 6 crystalsE/E = 1.3 %
1 x 1
3 x 3
L. Gan October 31, 2008 12
PbWO4 Position Resolution
x = 1.3 mm
L. Gan October 31, 2008 13
Rate dependence
L. Gan October 31, 2008 14
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
L. Gan October 31, 2008 15
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
