Andrea Giammanco
CMS Tracker Week April 2003 1
DS ROD Prototype: DS ROD Prototype:
““final” optohybrids final” optohybrids
““final” CCUM integrated in the rod final” CCUM integrated in the rod
with new FEC_to_CCUM adapter (Guido and Farooq)with new FEC_to_CCUM adapter (Guido and Farooq)
Noise Noise (briefly)(briefly)
Physics signalsPhysics signals
8 10 12
1
7
3
9 10
2 4 6
CCUM
5
XDAQ latest release(to be used in forthcoming beam test) New FEC supervisor Substantially higher speedCommissioned by Paolo & Laurent
Problems of PMC FED @ very low trigger frequencycured in the XDAQ software (Laurent) for cosmic runs
Andrea Giammanco
CMS Tracker Week April 2003 2
The ROD test setup
See previous talks See previous talks at the last tracker at the last tracker and cms weeks !and cms weeks !
Alu box, gas tight, with patch panel for pipes Alu box, gas tight, with patch panel for pipes ((CC66FF14 14 cooling and dry air) and other servicescooling and dry air) and other services
(it can house 2 rods)(it can house 2 rods)Modules, optohybrids, CCUM, high voltageModules, optohybrids, CCUM, high voltageDaq PC with 1 TSC, 1 FEC and 3 FED cards, Daq PC with 1 TSC, 1 FEC and 3 FED cards, DAQ SoftwareDAQ Software
Andrea Giammanco
CMS Tracker Week April 2003 3
Basic tuning procedure of DAQ settingswell established in XDAQ
discussed in previous system test presentations (Paolo)
Standard APV settingsTime alignment in the FEDPLL scanOptimization of laser bias and gain
[N.B. Isha=80 Vpsp=30 inverting mode]
(24 and 2, with non individual tuning)
Detailed study of noise & correlated noiseas for SS rod repeated for all modules
Excellent behaviour•low common mode•flat noise distribution
Andrea Giammanco
CMS Tracker Week April 2003 4
Noise studied in all modules…
7 1
82
8 10 12
17
39
510
2 4 6
CCUM
pedi=<ADCi>ev
tottot: RMS of ADCi-pedi
dd: RMS of 0.5(ADCi-ADCi+1)
nrmnrm: RMS of ADCi-pedi-CMN0
linlin: RMS of ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
FNAL modulesold ceramic hybrid - DCU2
Andrea Giammanco
CMS Tracker Week April 2003 5
Study of physics signals
106Ru61 (Q=3.5 MeV)
Cosmics
Analysis: tools developed byRoberto, Paolo, Andrea
Trigger rate ~500 Hz
Trigger rate ~0.5 Hz
TSC gate = 6 ns
Low voltage Hamamatsu PM
Well assessed delay scan to find signal (Laurent)
Andrea Giammanco
CMS Tracker Week April 2003 6
Cluster finding
1. S/N > 2 for every strip in a cluster2. S/N > 5 for the highest signal strip
Signal: sum of the signals of the strips
Noise: noise of the seed
Very simple cluster definition:
5
2
S/N
strips
cluster not acluster
(“seed”)
No special treatment for bad strips
Andrea Giammanco
CMS Tracker Week April 2003 7
Physics signals - sourceSource on the center of a sensorDeconvolution mode / inverter ON
S/N=21.2
Det #1
Andrea Giammanco
CMS Tracker Week April 2003 8
Physics signals - sourcepeak mode
inverter ON
S/N=33.3
Det #1
Andrea Giammanco
CMS Tracker Week April 2003 9
Det #7tottot: RMS of ADCi-pedi
dd: RMS of 0.5(ADCi-ADCi+1)
linlin: RMS of ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
nrmnrm: RMS of ADCi-pedi-CMN0
Group of missing and shorted bonds
missing bond (PA)
missing bond (S1-S2)
Partial signal recovery from neighbours:
Andrea Giammanco
CMS Tracker Week April 2003 10
Physics signals - Cosmics
~20% higher than rays
Deconvolution mode / inverter ON
S/N=25.6
Det #1
Andrea Giammanco
CMS Tracker Week April 2003 11
Time delay scan
Nclusters/Ntriggers vs delay
Nclusters/Ntriggers=95.5% @ t=0
Not the detector efficiency!
upper=Nupper&lower/Nlower=99.9%
lower=Nupper&lower/Nupper=99.8%
•noise of scintillator•spurious triggers (not ideal collimator)
Use only events seenby the other detector:
Det #7
Andrea Giammanco
CMS Tracker Week April 2003 12
Source on the bonding
Nclusters/Ntriggers=79.3% @ t=0
subtracting
Source on the center
Source on the bonding
Det #7
Evidence for region with lower charge collection efficiency near the edge
normalized to same area
Andrea Giammanco
CMS Tracker Week April 2003 13
Source on the overlap
8 10 12
17
39
510
2 4 6
CCUM
x axis
7 1
2 8
Andrea Giammanco
CMS Tracker Week April 2003 14
Alignment
7-1: 1.2+-0.1 strips 7-8: 1.5+-0.7 strips
8 10 12
17
39
510
2 4 6
CCUM
Rod alignment pins were not integrated!
x axis
2-8: 0.5+-0.2 strips(220+-18 m) (91+-36 m) (275+-128 m)
Andrea Giammanco
CMS Tracker Week April 2003 15
“Tracking” with 2 hits
8 10 12
17
39
510
2 4 6
CCUM
Deviations from linearity due to the finite size of the source
3 mm7
1
m=tg Slope of the line passingthrough the hits in 7 & 1
vsPosition on 7
x positionof the source
Andrea Giammanco
CMS Tracker Week April 2003 16
“Tracking” with 4 hits
8 10 12
17
39
510
2 4 6
CCUM
Slope of the best fit linefor the hits in 7 & 1 & 2 & 8
vsPosition on 7
3 mm
3 mm
8 mm
x axis
x axis
71
28
m=tg
x positionof the source
Andrea Giammanco
CMS Tracker Week April 2003 17
Conclusions Fully equipped DS rod thoroughly tested also with physics signals: no problem found. Analysis of physics signals provides a complementary view of detector defects. Simple method to qualify rod geometry commissioned.Calibration of 106Ru61vs high energy cosmic muons performed
106Ru61: Cosmics:deco:peak:
S/N=21S/N=33
S/N=25If muons (@ 500 m) = 40000 electrons
noise (@ deco) = 1600 electronsidentical to predictions.
Andrea Giammanco
CMS Tracker Week April 2003 18
Electrons vs capacitance
2000
1600
1200
800
400
02520151050-5-10
chan 2 chan 43 chan 107
closed symbols: peak mode: 270 + 38/pFopen symbols:deconvolution: 430 + 61/pF
2000
1600
1200
800
400
02520151050-5-10
chan 2 chan 43 chan 107
closed symbols: peak mode: 270 + 38/pFopen symbols:deconvolution: 430 + 61/pF
Andrea Giammanco
CMS Tracker Week April 2003 19
Noise: module #7FNAL module - old ceramic hybrid - DCU2
To be compared with performance on physics signals
(deconvolution)(deconvolution)
pedi=<ADCi>ev
tottot: RMS of ADCi-pedi
dd: RMS of 0.5(ADCi-ADCi+1)
nrmnrm: RMS of ADCi-pedi-CMN0
linlin: RMS of ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
Andrea Giammanco
CMS Tracker Week April 2003 20
Noise: module #1FNAL module - old ceramic hybrid - DCU2
To be compared with performance on physics signals
(deconvolution)(deconvolution)
pedi=<ADCi>ev
tottot: RMS of ADCi-pedi
dd: RMS of 0.5(ADCi-ADCi+1)
nrmnrm: RMS of ADCi-pedi-CMN0
linlin: RMS of ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
Andrea Giammanco
CMS Tracker Week April 2003 21
Noise: module #8FNAL module - old ceramic hybrid - DCU2
To be compared with performance on physics signals
(deconvolution)(deconvolution)
pedi=<ADCi>ev
tottot: RMS of ADCi-pedi
dd: RMS of 0.5(ADCi-ADCi+1)
nrmnrm: RMS of ADCi-pedi-CMN0
linlin: RMS of ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
Andrea Giammanco
CMS Tracker Week April 2003 22
Noise: module #2FNAL module - old ceramic hybrid - DCU2
To be compared with performance on physics signals
(deconvolution)(deconvolution)
pedi=<ADCi>ev
tottot: RMS of ADCi-pedi
dd: RMS of 0.5(ADCi-ADCi+1)
nrmnrm: RMS of ADCi-pedi-CMN0
linlin: RMS of ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
Andrea Giammanco
CMS Tracker Week April 2003 23
Det #7
ADCi-pedi-CMNi
CMN0 = <ADCi-pedi>strip
CMNi = b+a ia = CM Slope
Non gaussian noise!
ADCi-pedi-CMN0
kurtosis
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