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The HyCal Calorimeter

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. PbWO 4 Module Development. Size: 20.5x20.5x180 mm 3 Tolerances: +0.0-0.1 in trans.

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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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