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Quality Assurance of HPDs

Quality Assurance of HPDs. Arjan .H.Heering Rochester, 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

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Quality Assurance of HPDs

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  1. Quality Assurance of HPDs Arjan .H.Heering Rochester, October 20’01

  2. 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 -leakage current of each pixel AC measurements -Capacitance and depletion -AC and DC Crosstalk - signal to noise for single p.e. -Database All data from each tube will be accessible through the web

  3. HV connector and 1Gohm resistor 2 weeks of HV testing under 13 KV Alignment measurement Alignment QA QA flow for each HPD in Minnesota DEP DC measurements in darkroom Custom Alignment ring AC measurement in 2 dedicated room FNAL Interface Cart and packaging

  4. 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 to FNAL

  5. HPD alignment before and after correction (8 tubes corrected)

  6. 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 2002 We need the final routing for HE and HB( HO?) - Cookies and alignment Support plates are already over budget Can we use production ODUs for HE?

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