5/10/2010 1GlueX Col meeting, A. Gasparian

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The PrimEx HyCal Calorimeter

A. GasparianNC A&T State University, Greensboro, NC

Outline

HyCal calorimeter PbW04 detectors Resolutions Transition region

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The PrimEx HyCal Calorimeter

1152 PbWO4 individual crystal detectors (70 x 70 cm2 insertion)

GlueX Col meeting, A. Gasparian

576 Lead Glass detectors

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The HYCAL Calorimeter (Crystal part)

GlueX Col meeting, A. Gasparian

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PbWO4 Crystal Dimensions

Geometrical size:

20.5 x 20.5 x 180.0 mm3

Tolerances (mm):

20.5 + 0.0 - 0.1 180.0 + 0.3 -0.0 Specified

Measured

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PbWO4: Optical Properties

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PbWO4: Position Resolution vs. Energy

Detector characteristics and resolution have been done in different ways: with secondary electron beam (PS in Hall B); with low intensity tagged photon beam (Hall B tagger)

σ =2.7 mm @ 1. GeV

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PbWO4: Position Resolution vs. impact coordinate

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Lead-Glass: Position Resolutionvs. Energy

σ =5.6 mm @ 1. GeV

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PbWO4: Energy Resolution vs. Energy

σ =2.45% @ 1. GeV

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Lead-Glass: Energy Resolution vs. Energy

σ =5.7% @ 1. GeV

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Transition Region: PbWO4 - Lead-Glass

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Transition Region: PbWO4 - Lead-GlassReconstructed Coordinate

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Transition Region: PbWO4 - Lead-GlassReconstructed Coordinate (Eγ = 5.2 GeV)

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Transition Region: PbWO4 - Lead-GlassPosition Resolution (Eγ = 5.2 GeV)

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Transition Region: PbWO4 - Lead-GlassReconstructed Energy (Eγ = 5.2 GeV)

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Transition Region: PbWO4 - Lead-GlassEnergy Resolution (Eγ = 5.2 GeV)

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Sensitivity to Magnetic Field

GlueX Col meeting, A. Gasparian

Possible modifications:

change the G10 housing to sift ion housing and extend it to ~1”

insert optical extension

extend the brass strips (look at different options first)No need to change the optical wrapping

The current design do not have extended µ-metal on photocathode Try to shield the FCAL frame with some µ-metal, if it is all possible

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Summary

The Hybrid Calorimeter concept have been successfully reapproved with the HyCal calorimeter in the PrimEx experiment.

Technical and methodical aspects of the Hybrid calorimeter are well understood and tested. On-site expertise is available.

HyCal is equipped with ~2000 channel power supply (CAEN) unit; Trigger and analog electronics are old.

1152 PbWO4 high resolution, radiation hard crystal detectors are available for future experiments.

HyCal will stay in Hall B up to the end of PrimEx-II experiment.

GlueX Col meeting, A. Gasparian

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The End

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Invariant Mass Resolution

PbWO4

onlyPb-Glassonly