all channels that appear as dead have pinholes, except channel #268 (shorted bond)
DESCRIPTION
All channels that appear as dead have pinholes, except channel #268 (shorted bond). All channels that appear as dead have pinholes. Channels with pinholes have lower gain. Channel with pinhole: normal number of hits. Channel next to pinhole: high number of hits. - PowerPoint PPT PresentationTRANSCRIPT
Gain M5T50001-ST0: no bias
0
1
2
3
4
5
6
7
8
0 64 128 192 256 320 384
Channel #
Ou
tpu
t [m
V/f
C]
All channels that appear as dead have pinholes,except channel #268 (shorted bond).
Gain M5T50001-ST1: no bias
0
1
2
3
4
5
6
7
8
0 64 128 192 256 320 384
Channel #
Ou
tpu
t [m
V/f
C]
All channels that appear as dead have pinholes.
Gain M5T50001-ST0: with bias
0
1
2
3
4
5
6
7
8
0 64 128 192 256 320 384
Channel #
Ou
tpu
t [m
V/f
C]
Channels with pinholes have lower gain.
Gain M5T50001-ST1: with bias
0
1
2
3
4
5
6
7
8
0 64 128 192 256 320 384
Channel #
Ou
tpu
t [m
V/f
C]
Noise M5T50001-ST0
0
0.5
1
1.5
2
2.5
0 64 128 192 256 320 384
Channel #
No
ise
[mV
]
Noise M5T50001-ST1
0
0.5
1
1.5
2
2.5
0 64 128 192 256 320 384
Channel #
No
ise
[mV
]
Hit Distribution M5T50001-ST0
0
20
40
60
80
100
120
140
0 64 128 192 256 320 384
Channel #
Signal Distribution M5T50001-ST0
0
50
100
150
200
250
300
350
400
450
15 20 25 30 35 40 45 50 55 60 65 70
Signal [mV]
Signal/Noise Distribution M5T50001-ST0
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100
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400
500
600
10 15 20 25 30 35 40 45 50 55
s/n
Hit distribution/ Pinholes
0
20
40
60
80
100
120
140
320 336 352 368 384
Channel #
Channel with pinhole: normal number of hits
Channel next to pinhole: high number of hits
Summary of test results on M5T50001
•Average gain: 6.2 mV/fC
•Dead channels (bonding shorts): 1 channel, 0.1% of module
•Average noise: 1.44 mV
•Peak signal: 24 mV
•Peak signal/ Gain = 24/6.2 = 3.9 fC (~1 MIP)
•Peak S/N: 17
•Pinholes: 26 on sensors, 23 seen as having lower gain
•On source test, channels with pinholes have expected number of hits, but the neighboring channel has higher number of hits than expected.