BCAL Status Report - HPMT operation - Readout geometry - SciFi tests & analysis - Prototype construction Zisis Papandreou, Regina November 1 st, 2001

Preliminary HPMT tests DEP PP0350G Discharging problem: partly solved Pre-amp selection: partly solved Signals observed from radioactivity source using a NaI detector Direct communication with DEP established Personnel: Electronics engineer, technician, postdoc (Vitaly Kovaltchouk)

HPMT Testing Chores Need to perfect the electronic circuit Fast charge pre-amp Suitable pulse shaper HV-rated cables Communicate with DEP Modify the detector design Transfer knowledge Bench tests Operate with Flasher Operate with Cosmic Rays

HPMT Geometry (10 PMTs)? Tough-cookie design! Solution: DEP redesigns the electronics housing 10 HPMTs per side = 1000 PMTs ($2.5M)

Readout & Geometry Issues Optimize area reduction (4:1) Light guides and Winston Cones HPMTs must be staggered for clearance No. of HPMTs must be settled GUIDEIT MC simulations required Fiber-to-fiber coupling & standard PMTs VLPCs Good neighbor policy: Solenoid Drift chambers

SciFi Tests First round of cosmic ray and TRIUMF tests completed;good results Analysis: Extract index of refraction Improve timing resolution in software Look at particle ID Compare results with cosmic ray tests Order Kuraray multi-clad fibers and test Repeat cosmic-ray measurements Begin prototype construction