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