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MPPC tests - Warsaw. Michał Dziewiecki Robert Kurjata Robert Sulej Marcin Ziembicki. The Machine. Software. Running on single computer Full control of the device Data acquisition via Ethernet On-line data processing (10.5 MB/s) Automatic parameters calculation (gain, V br , …). - PowerPoint PPT Presentation
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MPPC tests - Warsaw
Michał DziewieckiRobert Kurjata
Robert Sulej Marcin Ziembicki
The Machine
Software
•Running on single computer•Full control of the device•Data acquisition via Ethernet•On-line data processing (10.5 MB/s)•Automatic parameters calculation (gain, Vbr, …)
Histograms fitting
Measurements status
Processed till now: ≈600 pcs≈100 devices measured at multiple
voltagesFinish: within next two weeks (huge
throughput)Some devices need to be tested once
again (≈5%)
Results – relative gain at Vop
0.9 0.92 0.94 0.96 0.98 1 1.02 1.04 1.06 1.080
20
40
60
80
100
120
140
0.9 0.92 0.94 0.96 0.98 1 1.02 1.04 1.06 1.080
20
40
60
80
100
120
0 100 200 300 400 500 60080
81
82
83
84
85
86
87
88
0 100 200 300 400 500 60078
80
82
84
86
88
90
Calculations based on fft-filtered histogram
Calculations based on gaussian fit
400 500 600 700 800 900 10000
10
20
30
40
50
60
70
80
90
Results – dark rate
0 100 200 300 400 500 600100
200
300
400
500
600
700
800
900
1000
0.5 (red) and 1.5 p.e (blue) dark rates for 570 sensors
operating at nominal Vop
Dark rates histogram
Results – dark rate
Dark Rate vs Hamamatsu
400
500
600
700
800
900
1000
500 600 700 800 900 1000 1100 1200 1300
Dark Rate [kHz] (Hamamatsu)
Dar
k R
ate
[kH
z] (
mea
sure
d)
0.17
0.19
0.21
0.23
0.25
0.27
0.29
0.31
0.17 0.19 0.21 0.23 0.25 0.27 0.29 0.31
Dark rate (ADCreadout)D
ark
rate
(d
iscr.
read
ou
t)
Warsaw vs Hamamatsu dark rate measurements Two method of dark rate
measurement: using discriminator or sampling ADC
Results – PDE (some problems)
0 100 200 300 400 500 6000
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
Flasher settings were changed during measurements
Integration time was changed
PDE (with dark-rate-correction) for whole series
0 50 100 150 200 250 300 3500
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
Dark rate measured with discriminator
Blue: dark rate estimated using ADC (only 3 batches)
0.75 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 1.25
10
20
30
40
50
60
70
80
Relative PDE histogram
Gain & dark-rate vs voltage
Gain vs Vop
1.5 p.e.
0.5 p.e.
Automatically calculated VBR
CT & AP
Necessary data is acquiredCT and AP rates are not calculated at
the moment
Thank you.
