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The HyCal Calorimeter

The collaboration has successfully developed 1250 high-resolution PbWO4 crystal shower detector modules for a Hybrid Electromagnetic calorimeter (HyCal). The HyCal underwent rigorous beam tests, showing exceptional energy and position resolutions, stability, and photon detection efficiency. This technology can be utilized in future experiments requiring precise calorimetry measurements.

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The HyCal Calorimeter

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  1. The HyCal Calorimeter Outline • The crystal modules • The frame and transporter • Temperature stability • Beam test results • Summary A. Gasparian NC A&T State University, Greensboro, NC Cal. Workshop, Oct. 31, 2008

  2. 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 Cal. Workshop, Oct. 31, 2008

  3. PbWO4 Module Development HVD G10 PMT housing with R4125HA tube VM-2000 and Tedlar wrapping (38.1 microm) 25 microm brass strips Readout cable GlueX/PrimEx meeting

  4. Calorimeter Assembly Cal. Workshop, Oct. 31, 2008

  5. HYCAL in Hall B with Transporter • Energy resolution • Position resolution • Good photon detection efficiency @ 0.1 – 5 GeV; • Large geometrical acceptance PbWO4 crystals resolution Pb-glass budget Design concept hybrid calorimeter • 1152 PbWO4 crystal detectors • 576 Pb-glass Cherenkov detectors Cal. Workshop, Oct. 31, 2008

  6. HyCal Temperature Stabilization Gain vs. temperature: ~ 2% per degrees @ 18 degrees Cal. Workshop, Oct. 31, 2008

  7. Beam Tests: PbWO4 Energy Resolution Prototype Tests HYCAL Beam Test 3 x 3 1 x 1 6 x 6 crystals E/E = 1.3 % Cal. Workshop, Oct. 31, 2008

  8. Beam Tests: PbWO4 Position Resolution HYCAL Beam Test Prototype Tests x = 1.3 mm Cal. Workshop, Oct. 31, 2008

  9. HYCAL: Transition Region

  10. Summary • The PrimEx collaboration in the past eight years has been developed and constructed 1250 PbWO4 high resolution crystal shower detector modules. • 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 HyCal undergone successful tests in the PrimEx experiment with high intensity photon beam passing the central 4x4 cm2 hole during three months of radiation. • 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. Cal. Workshop, Oct. 31, 2008

  11. The End Cal. Workshop, Oct. 31, 2008

  12. PbWO4 Development:Optical Properties Optical transparency Cal. Workshop, Oct. 31, 2008

  13. 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 Cal. Workshop, Oct. 31, 2008

  14. PbWO4 Detector Response vs. Dose Rate Cal. Workshop, Oct. 31, 2008

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