The HyCal Calorimeter
A. GasparianNC A&T State University,
Greensboro, NC
Outline
The crystal modules The frame and transporter Temperature stability Beam test results Summary
A. Gasparian 1Cal. Workshop, Oct. 31, 2008
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PbWO4 Module Development
Size: 20.5x20.5x180 mm3
Tolerances: +0.0-0.1 in trans. +0.3-0.0 in long.
Total number of crystals 1250
6/19/2008
PbWO4 Module Development
GlueX/PrimEx meeting
HVD
G10 PMT housing with R4125HA tube
VM-2000 and Tedlar wrapping (38.1 microm)
25 microm brass strips
Readout cable
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Calorimeter Assembly
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HYCAL in Hall B with Transporter
1152 PbWO4 crystal detectors 576 Pb-glass Cherenkov detectors
Energy resolution Position resolution Good photon detection efficiency @ 0.1 – 5 GeV; Large geometrical acceptance
PbWO4 crystals resolutionPb-glass budget
Design concept hybrid calorimeter
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HyCal Temperature Stabilization
Gain vs. temperature: ~ 2% per degrees @ 18 degrees
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Beam Tests: PbWO4 Energy Resolution
6 x 6 crystalsE/E = 1.3 %
1 x 1
3 x 3
HYCAL Beam TestPrototype Tests
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Beam Tests: PbWO4 Position Resolution
x = 1.3 mm
Prototype Tests HYCAL Beam Test
04/21/23 9
HYCAL: Transition Region
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Summary
Based on these crystal modules a high resolution Hybrid Electromagnetic calorimeter (HyCal) has been designed, developed and constructed with the 1118 x 118 cm2 size.
The expertise and accumulated experience of the PrimEx collaboration can be used to construct a larger size crystal calorimeter to be used in different 12 GeV leading experiments.
The PrimEx collaboration in the past eight years has been developed and constructed 1250 PbWO4 high resolution crystal shower detector modules.
The HyCal undergone successful tests in the PrimEx experiment with high intensity photon beam passing the central 4x4 cm2 hole during three months of radiation.
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The End
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PbWO4 Development:Optical Properties
Optical transparency
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PbWO4 Development
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: from 650 to 1250 Critical for the experiment
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PbWO4 Detector Response vs. Dose Rate