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Andrea Giammanco CMS Tracker Week April 20031 DS ROD Prototype: “final” optohybrids “final” CCUM integrated in the rod with new FEC_to_CCUM adapter (Guido.

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Presentation on theme: "Andrea Giammanco CMS Tracker Week April 20031 DS ROD Prototype: “final” optohybrids “final” CCUM integrated in the rod with new FEC_to_CCUM adapter (Guido."— Presentation transcript:

1 Andrea Giammanco CMS Tracker Week April 20031 DS ROD Prototype: “final” optohybrids “final” CCUM integrated in the rod with new FEC_to_CCUM adapter (Guido and Farooq) Noise (briefly) Noise (briefly) Physics signals Physics signals 81012 1 7 3 910 246 CCUM 5 XDAQ latest release (to be used in forthcoming beam test)  New FEC supervisor  Substantially higher speed Commissioned by Paolo & Laurent Problems of PMC FED @ very low trigger frequency cured in the XDAQ software (Laurent) for cosmic runs

2 Andrea Giammanco CMS Tracker Week April 20032 The ROD test setup See previous talks at the last tracker and cms weeks ! Alu box, gas tight, with patch panel for pipes ( C 6 F 14 cooling and dry air) and other services (it can house 2 rods) Modules, optohybrids, CCUM, high voltage Daq PC with 1 TSC, 1 FEC and 3 FED cards, DAQ Software

3 Andrea Giammanco CMS Tracker Week April 20033 Basic tuning procedure of DAQ settings well established in XDAQ discussed in previous system test presentations (Paolo) Standard APV settings Time alignment in the FED PLL scan Optimization of laser bias and gain [N.B. I sha =80 V psp =30 inverting mode] (24 and 2, with non individual tuning) Detailed study of noise & correlated noise as for SS rod repeated for all modules Excellent behaviour low common mode flat noise distribution

4 Andrea Giammanco CMS Tracker Week April 20034 Noise studied in all modules… 7 1 8 2 81012 1 7 3 9 5 10 246 CCUM ped i = ev  tot  tot : RMS of ADC i -ped i  d  d : RMS of 0.5(ADC i -ADC i+1 )  nrm  nrm : RMS of ADC i -ped i -CMN 0  lin  lin : RMS of ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope FNAL modules old ceramic hybrid - DCU2

5 Andrea Giammanco CMS Tracker Week April 20035 Study of physics signals 106 Ru 61 (Q=3.5 MeV) Cosmics Analysis: tools developed by Roberto, 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)

6 Andrea Giammanco CMS Tracker Week April 20036 Cluster finding 1.S/N > 2 for every strip in a cluster 2.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 a cluster (“seed”) No special treatment for bad strips

7 Andrea Giammanco CMS Tracker Week April 20037 Physics signals - source Source on the center of a sensor Deconvolution mode / inverter ON S/N=21.2 Det #1

8 Andrea Giammanco CMS Tracker Week April 20038 Physics signals - source peak mode inverter ON S/N=33.3 Det #1

9 Andrea Giammanco CMS Tracker Week April 20039 Det #7  tot  tot : RMS of ADC i -ped i  d  d : RMS of 0.5(ADC i -ADC i+1 )  lin  lin : RMS of ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope  nrm  nrm : RMS of ADC i -ped i -CMN 0 Group of missing and shorted bonds missing bond (PA) missing bond (S1-S2) Partial signal recovery from neighbours:

10 Andrea Giammanco CMS Tracker Week April 200310 Physics signals - Cosmics ~20% higher than  rays Deconvolution mode / inverter ON S/N=25.6 Det #1

11 Andrea Giammanco CMS Tracker Week April 200311 Time delay scan N clusters /N triggers vs delay N clusters /N triggers =95.5% @ t=0 Not the detector efficiency!  upper =N upper&lower /N lower =99.9%  lower =N upper&lower /N upper =99.8% noise of scintillator spurious triggers (not ideal collimator) Use only events seen by the other detector: Det #7

12 Andrea Giammanco CMS Tracker Week April 200312 Source on the bonding N clusters /N triggers =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

13 Andrea Giammanco CMS Tracker Week April 200313 Source on the overlap 81012 1 7 3 9 5 10 246 CCUM x axis 71 2 8

14 Andrea Giammanco CMS Tracker Week April 200314 Alignment 7-1: 1.2+-0.1 strips 7-8: 1.5+-0.7 strips 81012 1 7 3 9 5 10 246 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)

15 Andrea Giammanco CMS Tracker Week April 200315 “Tracking” with 2 hits 81012 1 7 3 9 5 10 246 CCUM Deviations from linearity due to the finite size of the source 3 mm 7 1  m=tg  Slope of the line passing through the hits in 7 & 1 vs Position on 7 x position of the source

16 Andrea Giammanco CMS Tracker Week April 200316 “Tracking” with 4 hits 81012 1 7 3 9 5 10 246 CCUM Slope of the best fit line for the hits in 7 & 1 & 2 & 8 vs Position on 7 3 mm 8 mm x axis 7 1 2 8  m=tg  x position of the source

17 Andrea Giammanco CMS Tracker Week April 200317 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 106 Ru 61 vs high energy cosmic muons performed 106 Ru 61 : Cosmics: deco: peak: S/N=21 S/N=33 S/N=25 If muons (@ 500  m) = 40000 electrons noise (@ deco) = 1600 electrons identical to predictions.

18 Andrea Giammanco CMS Tracker Week April 200318 Electrons vs capacitance

19 Andrea Giammanco CMS Tracker Week April 200319 Noise: module #7 FNAL module - old ceramic hybrid - DCU2 To be compared with performance on physics signals (deconvolution) ped i = ev  tot  tot : RMS of ADC i -ped i  d  d : RMS of 0.5(ADC i -ADC i+1 )  nrm  nrm : RMS of ADC i -ped i -CMN 0  lin  lin : RMS of ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope

20 Andrea Giammanco CMS Tracker Week April 200320 Noise: module #1 FNAL module - old ceramic hybrid - DCU2 To be compared with performance on physics signals (deconvolution) ped i = ev  tot  tot : RMS of ADC i -ped i  d  d : RMS of 0.5(ADC i -ADC i+1 )  nrm  nrm : RMS of ADC i -ped i -CMN 0  lin  lin : RMS of ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope

21 Andrea Giammanco CMS Tracker Week April 200321 Noise: module #8 FNAL module - old ceramic hybrid - DCU2 To be compared with performance on physics signals (deconvolution) ped i = ev  tot  tot : RMS of ADC i -ped i  d  d : RMS of 0.5(ADC i -ADC i+1 )  nrm  nrm : RMS of ADC i -ped i -CMN 0  lin  lin : RMS of ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope

22 Andrea Giammanco CMS Tracker Week April 200322 Noise: module #2 FNAL module - old ceramic hybrid - DCU2 To be compared with performance on physics signals (deconvolution) ped i = ev  tot  tot : RMS of ADC i -ped i  d  d : RMS of 0.5(ADC i -ADC i+1 )  nrm  nrm : RMS of ADC i -ped i -CMN 0  lin  lin : RMS of ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope

23 Andrea Giammanco CMS Tracker Week April 200323 Det #7 ADC i -ped i -CMN i CMN 0 = strip CMN i = b+a i a = CM Slope Non gaussian noise! ADC i -ped i -CMN 0 kurtosis

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