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Hybrid PMT Tests & Geometry Zisis Papandreou Detector Interface Meeting Bloomington, Indiana November 1 st, 2001.

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Presentation on theme: "Hybrid PMT Tests & Geometry Zisis Papandreou Detector Interface Meeting Bloomington, Indiana November 1 st, 2001."— Presentation transcript:

1 Hybrid PMT Tests & Geometry Zisis Papandreou Detector Interface Meeting Bloomington, Indiana November 1 st, 2001

2 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

3 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

4 HPMT Old Geometry (6 PMTs)

5 A tight squeeze! KLOE Winston Cones – Module-0

6 HPMT New Geometry (10 PMTs)? Tough-cookie design! Solution: DEP redesigns the electronics housing

7 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

8 HPMT Electronic Circuit

9 The real McCoy… DEP PP0350G DEP PP0100Z UofR HV regulator

10 Up close and personal

11 HPMT UofR Housing

12 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)

13 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

14 Flasher Tube

15 Flasher Test Setup

16 Zooming in…

17 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

18 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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