# Presentation: 234063

## Test of EMU ISR SystemJune-Sept 2000 at CERN ISR Tunnel

**Goal :  **
- Setup and monitor “chambers” with resolution of < 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 !

- Test of EMU ISR System***June-Sept 2000 at CERN ISR Tunnel***

## Prototype Test SetupJune-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

- Prototype Test Setup***June-Sept 2000 at CERN ISR Tunnel***

## 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**

**COCOA Reconstruction Results***(ISR Test Results – es10 Reference)*

## 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**

**COCOA Reconstruction Results***(ISR Test Results – es9 Reconstruction)*

## COCOA Reconstruction Results(ISR Test Results – es9 Reconstruction)

- Sample September Laser 302 Results (1 sensor)

- Sample September Laser 303 Results (1 sensor)

**COCOA Reconstruction Results***(ISR Test Results – es9 Reconstruction)*

## COCOA Reconstruction ResultsGeneral Remarks

- Large survey errors
- 60 m local  120 m global
- ~ 220 m Systematic Errors
- < 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

**COCOA Reconstruction Results***General Remarks*

## COCOA Reconstruction Results(Laser Independence)

**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*

- 30 pixels

**COCOA Reconstruction Results*****(Laser Independence)***

## COCOA Reconstruction ResultsThoughts on COCOA

- Comparison of COCOA Results to ‘Hand Calculations’
- We have verified operation in simple EMU type systems to < 100 m
- We cannot verify in ISR EMU system to <400 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

## COCOA Reconstruction ResultsThe 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)

## Extra Slides

## COCOA Reconstruction Results (ISR Test Results)

- Sample September Laser 302 Results (1 sensor)

- Sample September Laser 303 Results (1 sensor)

**COCOA Reconstruction Results ***(ISR Test Results)*

## 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.

**COCOA Reconstruction Results*****(Laser Independence)***

## FLAP Fitting Routines

- CCD Peaks in es9 from laser 302 ...

- CCD Peaks in es9 from laser 303 taken
*immediately* after laser 302 data...