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Hybrid PMT Tests & Geometry

Hybrid PMT Tests & Geometry. Zisis Papandreou Detector Interface Meeting Bloomington, Indiana November 1 st , 2001. BCAL Dimensions (CDR). Length: 4 m Outer Radius: 90 cm Thickness: 20-25 cm (~16X 0 ) Pb Radiation Length: 1X 0 = 0.56 cm No. of modules: 48 (96 phi slices)

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Hybrid PMT Tests & Geometry

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

  2. BCAL Dimensions (CDR) • Length: 4 m • Outer Radius: 90 cm • Thickness: 20-25 cm (~16X0) • Pb Radiation Length: 1X0 = 0.56 cm • No. of modules: 48 (96 phi slices) • No. of PMTs: 12 x 48 = 576

  3. BCAL 96 Phi/Readout Slices

  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 105 • Insensitive to high magnetic fields HV: -8kV Bias: -80V Pre-amp Shaper Fused silica window

  8. HPMT Electronic Circuit

  9. The real McCoy… DEP PP0100Z UofR HVregulator DEP PP0350G

  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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