1. The HyCal Calorimeter A. Gasparian NC A&T State University, Greensboro, NC Outline  The crystal modules  The frame and transporter  Temperature stability  Beam test results  Summary A. Gasparian1Cal. Workshop, Oct. 31, 2008

2. A. GasparianCal. Workshop, Oct. 31, 20082 PbWO 4 Module Development Size: 20.5x20.5x180 mm 3 Tolerances: +0.0-0.1 in trans. +0.3-0.0 in long.  Total number of crystals 1250

3. 6/19/2008 PbWO 4 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

4. A. GasparianCal. Workshop, Oct. 31, 20084 Calorimeter Assembly

5. A. GasparianCal. Workshop, Oct. 31, 20085 HYCAL in Hall B with Transporter  1152 PbWO 4 crystal detectors  576 Pb-glass Cherenkov detectors  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

6. A. GasparianCal. Workshop, Oct. 31, 20086 HyCal Temperature Stabilization Gain vs. temperature: ~ 2% per degrees @ 18 degrees

7. A. GasparianCal. Workshop, Oct. 31, 20087 Beam Tests: PbWO 4 Energy Resolution 6 x 6 crystals  E /E = 1.3 % 1 x 1 3 x 3 HYCAL Beam Test Prototype Tests

8. A. GasparianCal. Workshop, Oct. 31, 20088 Beam Tests: PbWO 4 Position Resolution  x = 1.3 mm Prototype Tests HYCAL Beam Test

9. 9/14/20159 HYCAL: Transition Region

10. A. GasparianCal. Workshop, Oct. 31, 200810 Summary  Based on these crystal modules a high resolution Hybrid Electromagnetic calorimeter (HyCal) has been designed, developed and constructed with the 1118 x 118 cm 2 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 cm 2 hole during three months of radiation.

11. A. GasparianCal. Workshop, Oct. 31, 200811 The End

12. A. GasparianCal. Workshop, Oct. 31, 200812 PbWO 4 Development: Optical Properties Optical transparency

13. A. GasparianCal. Workshop, Oct. 31, 200813 PbWO 4 Development Specified Size: 20.5x20.5x180 mm 3 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

14. A. GasparianCal. Workshop, Oct. 31, 200814 PbWO 4 Detector Response vs. Dose Rate