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Published byTyrone Alexander Modified over 9 years ago
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Hybrid PMT Tests & Geometry Zisis Papandreou Detector Interface Meeting Bloomington, Indiana November 1 st, 2001
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BCAL Dimensions (CDR) o Length: 4 m o Outer Radius: 90 cm o Thickness: 20-25 cm (~16X 0 ) o Pb Radiation Length: 1X 0 = 0.56 cm No. of modules: 48 (96 phi slices) No. of PMTs: 12 x 48 = 576
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BCAL 96 Phi/Readout Slices 1 st face width4.25 cm 2 nd face width4.80 cm 3 rd face width5.35 cm 4 th face width5.90 cm HPMT outer diameter HPMT active diameter 5.60 cm 2.55 cm Each Phi Segment side Total Area 210 cm 2 Area Reduction 4:1 HPMT Area 5 cm 2 No of HPMTs 10
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HPMT Old Geometry (6 PMTs)
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A tight squeeze! KLOE Winston Cones – Module-0
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HPMT New Geometry (10 PMTs)? Tough-cookie design! Solution: DEP redesigns the electronics housing
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What’s a Hybrid? Proximity-focused vacuum tube Fast rise- and fall-time (2, 12 ns) High QE for UV, Gain is 10 5 Insensitive to high magnetic fields Fused silica window HV: -8kV Bias: -80V Pre-amp Shaper
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HPMT Electronic Circuit
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The real McCoy… DEP PP0350G DEP PP0100Z UofR HV regulator
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Up close and personal
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HPMT UofR Housing
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Preliminary HPMT tests Discharging problem: partly solved Pre-amp selection: solved Signals observed from radioactivity source using a NaI detector Direct communication with DEP established Personnel: Electronics engineer, technician, postdoc (Vitaly Kovaltchouk)
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Regina “Flasher” Was recently apprehended. Replacement: Optitron Xe-N Flasher System 200 psi 20 kV across the electrodes Pulse resembles scintillator pulse Externally triggered, frequency controlled, or single flash modes
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Flasher Tube
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Flasher Test Setup
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Zooming in…
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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
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HPMT Geometry List 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 Good neighbor policy: Solenoid Drift chambers
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