quality assurance of hpds
DESCRIPTION
Quality Assurance of HPDs. Arjan .H.HeeringRochester, October 20’01. HPD Quality Assurance. -DEP HV 1 hour under 15 kV leakage current Quantum efficiency > 11% Pluse shape dark noise spectrum -Minnesota. DC measurements -uniformity -bias behavior -HV and gain - PowerPoint PPT PresentationTRANSCRIPT
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Quality Assurance of HPDs
Arjan .H.Heering Rochester, October 20’01
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DC measurements-uniformity-bias behavior-HV and gain-leakage current of each pixel
AC measurements -Capacitance and depletion-AC and DC Crosstalk- signal to noise for single p.e.
HPD Quality Assurance
-DEP HV 1 hour under 15 kVleakage currentQuantum efficiency > 11%Pluse shapedark noise spectrum
-Minnesota
-DatabaseAll data from each tube will be accessible through the web
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QA flow for each HPD in Minnesota
HV connector and 1Gohm resistor2 weeks of HV testing under 13 KVDEP
Alignment measurement
DC measurements in darkroom
AC measurement in 2 dedicated room
Alignment QA
Custom Alignment ring
FNAL Interface Cart and packaging
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Alignment procedure
-We reference the HPD on the ceramic carrier
- All carriers are within 80 microns, square
-we have send go/no go Jigs to DEP (0.003 inch difference)
-we use 3 sizes (0.001 difference) of carriers
- the best fit will be used for alignment measurement
-x ,y , rot offset from normal is measured (+-10micron)
-each HPD get a compensated offset ring for:-size-x-offset-y-offset-rotation offset
-Alignment is measured again before shipment toFNAL
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X-offset in microns
before
after
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Y-offset in microns
before
after
01234567
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Rotation-offset in mrad
before
after
HPD alignment before and after correction(8 tubes corrected)
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2002 Test Beam HPDs
Minnesota will send the first production HPDs to FNAL
Delivery:
March 1 : 10 HPDs (HB)April 1: 10 HPDs (HE)May 1: 10 HPDs (HO?)
-Interface Carts Production start 1/1 2002We need the final routing forHE and HB( HO?)
- Cookies and alignment Support plates are already over budgetCan we use production ODUs for HE?