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

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

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

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

A. GasparianCal. Workshop, Oct. 31, HYCAL in Hall B with Transporter  1152 PbWO 4 crystal detectors  576 Pb-glass Cherenkov detectors  Energy resolution  Position resolution  Good photon detection 0.1 – 5 GeV;  Large geometrical acceptance PbWO4 crystals resolution Pb-glass budget Design concept hybrid calorimeter

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

A. GasparianCal. Workshop, Oct. 31, 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

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

9/14/20159 HYCAL: Transition Region

A. GasparianCal. Workshop, Oct. 31, 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.

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

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

A. GasparianCal. Workshop, Oct. 31, PbWO 4 Development Specified Size: 20.5x20.5x180 mm 3 Tolerances: in trans in long.  Collaboration managed to double the number of crystals: from 650 to 1250  Critical for the experiment

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