ds rod prototype: “final” optohybrids “final” ccum integrated in the rod

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


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


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


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


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


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


Physics signals - sourceSource on the center of a sensorDeconvolution mode / inverter ON

S/N=21.2

Det #1

Andrea Giammanco


Physics signals - sourcepeak mode

inverter ON

S/N=33.3

Det #1

Andrea Giammanco


Det #7tottot: RMS of ADCi-pedi






Group of missing and shorted bonds

missing bond (PA)

missing bond (S1-S2)

Partial signal recovery from neighbours:

Andrea Giammanco


Physics signals - Cosmics

~20% higher than rays

Deconvolution mode / inverter ON

S/N=25.6

Det #1

Andrea Giammanco


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


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


Source on the overlap

8 10 12

17

39

510

2 4 6

CCUM

x axis

7 1

2 8

Andrea Giammanco


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


“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


“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


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


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


Noise: module #7FNAL module - old ceramic hybrid - DCU2

To be compared with performance on physics signals

(deconvolution)(deconvolution)

pedi=<ADCi>ev







Andrea Giammanco





pedi=<ADCi>ev







Andrea Giammanco


Det #7

ADCi-pedi-CMNi



Non gaussian noise!

ADCi-pedi-CMN0

kurtosis

ds rod prototype: “final” optohybrids “final” ccum integrated in the rod

Documents

rms of adci

pedi d

physics signals cosmics

ss rod

final optohybrids final

ds rod prototype

detector efficiency

ccum adapter guido