Hybrid PMT Tests & Geometry Zisis Papandreou Detector Interface Meeting Bloomington, Indiana...
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Transcript of Hybrid PMT Tests & Geometry Zisis Papandreou Detector Interface Meeting Bloomington, Indiana...
Hybrid PMT Tests & Geometry
Zisis PapandreouDetector Interface MeetingBloomington, IndianaNovember 1st, 2001
BCAL Dimensions (CDR)
o Length: 4 mo Outer Radius: 90 cm
o Thickness: 20-25 cm (~16X0)
o Pb Radiation Length: 1X0 = 0.56 cm
No. of modules: 48 (96 phi slices)No. of PMTs: 12 x 48 = 576
BCAL 96 Phi/Readout Slices
1st face width 4.25 cm
2nd face width 4.80 cm
3rd face width 5.35 cm
4th face width 5.90 cm
HPMT outer diameterHPMT active diameter
5.60 cm2.55 cm
Each PhiSegment side
Total Area210 cm2
Area Reduction
4:1
HPMT Area5 cm2
No of HPMTs10
HPMT Old Geometry (6 PMTs)
5.90 cm
5.35 cm
4.80 cm
4.25 cm HPMT
Staggered HPMTs
DEP-PP0350G 5.60 cm outer diameter 2.55 cm active diameter
Al plate 2.5 cm
A tight squeeze!
KLOE Winston Cones – Module-0
HPMT New Geometry (10 PMTs)?
Staggered HPMTs
DEP-PP0350G 5.60 cm outer diameter 2.55 cm active diameter
4.25 cm
HPMT
Al plate 2.5 cm
5.90 cm
4.80 cm
5.35 cm
Tough-cookie design!Solution:
DEP redesigns theelectronics housing
What’s a Hybrid?
Proximity-focused vacuum tubeFast rise- and fall-time (2, 12 ns)High QE for UV, Gain is 105
Insensitive to high magnetic fields
Fused silica window
HV: -8kVBias: -80VPre-ampShaper
HPMT Electronic Circuit
The real McCoy…
DEP PP0350G
DEP PP0100Z
UofR HV regulator
Up close and personal
HPMT UofR Housing
Preliminary HPMT tests
Discharging problem: partly solvedPre-amp selection: solvedSignals observed from radioactivity source using a NaI detectorDirect communication with DEP establishedPersonnel: Electronics engineer, technician, postdoc
(Vitaly Kovaltchouk)
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
Flasher Tube
Flasher Test Setup
Zooming in…
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 List
Optimize area reduction (4:1)Light guides and Winston ConesHPMTs must be staggered for clearanceNo. of HPMTs must be settledGUIDEIT MC simulations requiredGood neighbor policy: Solenoid Drift chambers