Transcript Noise results (First results)

Noise results from SR1 combined
SCT barrel tests
Summary of some initial results
Alan Barr, UCL
Pepe Bernabeu, Valencia
Data Sources
• Online calibration scans
– ROD and TIM triggered
• Physics mode scans + offline analysis
– Triggered from pulser
• Analysis:
– Online analysis of calibration scans
http://pcphsctr02.cern.ch/cgi-bin/datadisplay.cgi
– Offline noise analysis & monitoring
http://indico.cern.ch/conferenceDisplay.py?confId=4146
2
Overall noise occupancy
Chip average noise occupancy
Calibration run, asynchronous
ROD triggered
Run 2981, Scan 2
Hybrid temperature ~28C
1fC with cal correction factors
5x10-4
• The noise occupancy is within specification
3
LMT 7:
LMT 6:
B3
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LMT 8:
B4
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B5
LMT 13:
B6
Noise
Occupancy
(before
cosmics
run)
Temperature
Hybrid T1
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LMT 41:
LMT 39:
LMT 40:
2.00E-04-2.50E-04
LMT 42:
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LMT 40:
30-32
LMT 39:
1.50E-04-2.00E-04
LMT 38:
1.00E-04-1.50E-04
LMT 38:
5.00E-05-1.00E-04
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0.00E+00-5.00E-05
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28-30
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LMT 11:
LMT 10:
LMT 9:
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26-28
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24-26
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Run 2981, Scan 2, Module average NO 1fC with cal correction factors
6
5
4
3
2
1
-1
-2
-3
-4
-5
-6
32-34
6
5
4
3
2
1
-1
-2
-3
-4
-5
-6
4
Comparison to previous data
• Needs to be corrected for time biased,
temperature etc
• The noise occupancy
– Seems a little higher for single barrel test than
macroconstruction
– more so for barrels 3 and 6
– also perhaps a little higher for all barrels on than for
single barrel tests
• ENC input noise (from 3 point gain)
– perhaps 40-50 electrons greater than
macroconstruction results after temp corrections
– ENC input noise within 5 electrons of same-temp
module assembly values
5
B3
B4
B5
RUN 2871 before long cosmics run
1625-1650
1650-1675
1675-1700
1700-1725
1725-1750
LMT 42:
1600-1625
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3PG combined top + bottom
Hybrid temp ~28 C
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Noise in 3PG : ENC
1750-1775
5
3
1
-2
-4
-6
B6
6
Thresholds
• RMS noise occupancy decreases when using
calibration-capacitor-corrected “Response
Curve” 1 fC threshold
– As we would hope
• No change in mean NO
– From offline analysis
7
External Pickup?
• No hint so far of extra noise occupancy
due to TRT
– Offline analyses in progress
• Likewise for heaters:
– Runs: Off / On / Switching / Off
– Noise occupancy
8
Self pickup?
• Pickup from ABCD readout visible at end
of pipeline
– (±synch) double trigger noise test
– Factor of ~1.8 increase over several time bins
at end of pipeline
– Small effect when averaged out over 400 time
bins (for 100kHz triggers worst case)
9
Dependence on trigger rate
• Physics run: pulser rate varied from:
•
•
•
•
•
5 Hz
50 Hz
500 Hz
5k Hz
50 kHz
– No evidence of increase in noise occupancy
• Events sizes the same
• Plots look very similar
10
Correlations
• No increase in noise occupancy observed when using
synchronous triggers
• No correlations seen so far between noise hits within
chips (“occupancy per event”)
• No correlations seen so far between hits on different
modules
– Except cosmic tracks!
– Full correlation analysis in progress (Ewa)
Hits per event
Noise run
1 fC uncorrected
(trim target)
Gaussian
Tanaka et al
Cosmics run
11
Grounding schemes
#chip=(252+216)x12=5616
(2 modules are masked
online)
Tanaka et al
Run
3084
3085
Shorting out
in
Mean 4.57x10-5 4.57x10-5
RMS
3.42x10-5 3.39x10-5
line
red
blue
• No significant change in the noise occupancy
when we change the grounding scheme.
– Grounding scheme in SR1 is not “final”
– Final scheme only available in the pit
12
Noise stability
B3 Before cosmics run (2981)
LMT 24:
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LMT 22: 2.00E-04-2.50E-04
LMT 9:
1.50E-04-2.00E-04
1.00E-04-1.50E-04
LMT 8:
5.00E-05-1.00E-04
LMT 7:
0.00E+00-5.00E-05
LMT 6:
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
B3 After cosmics run (3102)
LMT 24:
LMT 23:
2.00E-04-2.50E-04
LMT 22:
1.50E-04-2.00E-04
LMT 9:
1.00E-04-1.50E-04
LMT 8:
5.00E-05-1.00E-04
LMT 7:
LMT 6:
-6
-5
-4
-3
-2
-1
1
2
3
4
5
6
0.00E+00-5.00E-05
• Long runs exist to
check overall stability
in time
• Calibration runs show
expected decrease in
NO after long period
biased
– Also seen in “physics”
runs
– Consistent with single
barrel tests
13
Noisy strips?
• A handful of strips cut out for offline analysis (of
order ten)
– In addition to channels masked online
• In some cases individual strip noises change
between runs by factors ~3
– Not understood
– Poor individual channel trim?
• Usual modulation across module
– Noise occupancy higher towards centre of chips
– Link 1 noisier than link 0
• (Both as they has always have been in module tests)
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Noise occupancy at end
of test period
Run 3102
B3
B4
B5
B6
Top Sector
4.56e-5
3.41e-5
4.17e-5
6.63e-5
Bottom Sector
4.14e-5
4.03e-5
4.27e-5
4.95e-5
• Overall average 4.13e-5
• Similar to single barrel tests
16
Overall conclusions
• Unless small increase in Noise Occupancy
seen for B6 or B3 scales badly with
#modules we are in good shape for noise
• Ultimate test will be using final grounding
scheme in the pit
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Backups
18
Noise physics run at end of
cosmics
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Reference 1
Heater tests
ON
Reference 2
Switching
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Chip average noise occupancy
Calibration run, asynchronous
Run 2981, Scan 2
Hybrid temperature ~28C
1fC with cal correction factors
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Difference in ENC noise 3PG
(Combined Top & Bottom Sectors Run) minus (SCTDAQ reference)
5
3
1
-2
B3
B4
B5
B6
-4
40-60
-6
20-40
5
0-20
3
-20-0
1
-40--20
-2
-60--40
-4
-6
Hybrid temps
~28C for both
22
LMT 24:
LMT 23:
LMT 22:
B3 Standalone
(2979)
2.00E-04-2.50E-04
1.50E-04-2.00E-04
LMT 9:
1.00E-04-1.50E-04
5.00E-05-1.00E-04
LMT 8:
0.00E+00-5.00E-05
LMT 7:
LMT 6:
-6
-5
-4
-3
-2
-1
1
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6
LMT 24:
B3 with other
barrels (2981)
LMT 23:
LMT 22:
LMT 9:
2.00E-04-2.50E-04
1.50E-04-2.00E-04
1.00E-04-1.50E-04
LMT 8:
5.00E-05-1.00E-04
LMT 7:
0.00E+00-5.00E-05
LMT 6:
-6
-5
-4
-3
-2
-1
1
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6
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