Transcript AC measurements

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
-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
QA flow for each HPD in Minnesota
DEP
HV connector and 1Gohm resistor
2 weeks of HV testing under 13 KV
Alignment measurement
DC measurements in darkroom
Custom Alignment ring
AC measurement in 2 dedicated room
Alignment QA
FNAL
Interface Cart and packaging
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
HPD alignment before and after correction
(8 tubes corrected)
X-offset in microns
before
200
150
100
50
0
-50
-100
-150
after
-200
6
5
4
3
2
1
0
Y-offset in microns
5
4
before
3
after
2
200
150
100
50
0
-50
-100
-150
0
-200
1
Rotation-offset in mrad
7
6
5
4
3
2
1
0
before
after
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
2002 Test Beam HPDs
Minnesota will send the first production
HPDs to FNAL
Delivery:
March 1 :
April 1:
May 1:
10 HPDs
10 HPDs
10 HPDs
(HB)
(HE)
(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?