Test of EMU ISR System JuneSept 2000 at CERN ISR Tunnel - PowerPoint PPT Presentation

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Test of EMU ISR System JuneSept 2000 at CERN ISR Tunnel

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Goal : Setup and monitor 'chambers' with resolution of 200. m Demonstrate ... Prediction of et3 dowel location direct from PG agrees within 10 m from CERN PG ... – PowerPoint PPT presentation

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Tags: cern | emu | isr | junesept | dowel | system | test | tunnel

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Title: Test of EMU ISR System JuneSept 2000 at CERN ISR Tunnel


1
Test of EMU ISR SystemJune-Sept 2000 at CERN ISR
Tunnel
  • Goal
  • Setup and monitor chambers with resolution of lt
    200 ?m
  • Demonstrate System Redundancy
  • Test Setup
  • 1 SLM Line
  • 1 Transfer Line
  • 1 Transfer Plate
  • Analog Sensors (Temp, Proximity)
  • Analysis
  • 5000 Events Taken
  • 1500 Events Reconstructed
  • Conclusions are not final
  • but we are close !

2
Prototype Test SetupJune-Sept 2000 at CERN ISR
Tunnel
  • Assumptions
  • Sensors et2, et3, and es10 are known
  • Transfer Plate definition is defined
  • Rotations of sensors are known within error
  • limits of photogrammetry

3
COCOA Reconstruction Results(ISR Test Results
es10 Reference)
SLM Line (Laser 302) Results of COCOA
Reconstruction for July/August and September
Runs Using es10 as the Final Reference Sensor
SLM Line (Laser 303) Results of COCOA
Reconstruction for July/August and September
Runs Using es10 as the Final Reference Sensor
4
COCOA Reconstruction Results(ISR Test Results
es9 Reconstruction)
SLM Line (Laser 302) Results of COCOA
Reconstruction for July/August and September
Runs Using es9 as the Final Reference Sensor
SLM Line (Laser 303) Results of COCOA
Reconstruction for July/August and September
Runs Using es9 as the Final Reference Sensor
5
COCOA Reconstruction Results(ISR Test Results
es9 Reconstruction)
Sample September Laser 302 Results (1 sensor)
Sample September Laser 303 Results (1 sensor)
6
COCOA Reconstruction ResultsGeneral Remarks
  • Note
  • Large survey errors
  • 60 ?m local ? 120 ?m global
  • 220 ?m Systematic Errors
  • lt 15 ?m Statistical Errors
  • General Conclusions
  • 4 CCD measurements on reference Sensors are
    critical
  • Reconstruction is roughly independent of laser
    choice (within error)
  • Reconstruction is independent of laser motions

7
COCOA Reconstruction Results(Laser Independence)
30 pixels
Distribution of raw CCD means in es4 during the
July/August Run. Jump of 30 pixels 420?m
Distribution of COCOA Reconstructed location of
es4 in the ISR hall during the July/August Run.
(?y 10 ?m, ?z 8 ?m)
Conclusion Shift in Laser not seen in
Reconstruction
8
COCOA Reconstruction ResultsThoughts on COCOA
  • Comparison of COCOA Results to Hand
    Calculations
  • We have verified operation in simple EMU type
    systems to lt 100 ?m
  • We cannot verify in ISR EMU system to lt400 ?m
    (rotations, calibration errors, transfer plate
    errors)
  • Evidence of COCOA Accuracy
  • Prediction of et3 dowel location direct from PG
    agrees within 10 ?m from CERN PG group
    determination
  • Prediction of et1-es1 separation on Transfer
    Plate within 30 ?m of CMM determination (full EMU
    simulation)
  • Concerns
  • Convergence of fit to local minima (false
    solutions)
  • Degenerate rotations possible

9
COCOA Reconstruction ResultsThe Bottom Line
(March 2001)
  • We can demonstrate reconstruction of sensor
    positions within 220 ?m of CERN PG
  • We can make redundant measurements
  • Real CMS Data Can Be Better Than March 2001
    Results
  • 3 CCDs only on Reference Sensors
  • (4 CCDs improve results)
  • Calibration Errors larger than expected, no
    calibration prior to installation
  • (better results with better calibration)
  • More Constraints on COCOA Fits
  • (Calibrated X-Hair Laser, Inclinometer
  • Data on Transfer Plate)

10
Extra Slides
11
COCOA Reconstruction Results (ISR Test Results)
Sample September Laser 302 Results (1 sensor)
Sample September Laser 303 Results (1 sensor)
12
COCOA Reconstruction Results(Laser Independence)
FLAP takes raw data and finds centroid of
charge distribution in each CCD
Laser Instability CDD centroids were found
to jump. Problem can be traced to laser diode.
13
FLAP Fitting Routines
CCD Peaks in es9 from laser 302
CCD Peaks in es9 from laser 303 taken
immediately after laser 302 data
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