kaori maeshima (fnal), alignment workshop at cern: may 17-18, 20011 endcap alignment status of...

Kaori Maeshima (FNAL), Alignment Workshop at CERN: May 17-18, 2001 1

Endcap AlignmentEndcap AlignmentEndcap AlignmentEndcap Alignment

Status of Offline Software

Alignment Workshop @ CERN

17, 18 May 2001

http://home.fnal.gov/~maeshima/alignment/alignment.html


June - Sept 2000 at CERN ISR Tunnel

Goal : • Setup and monitor “chambers” with resolution of < 200 m• Demonstrate System RedundancyTest Setup :• 1 SLM Line (2 Laser Redundancy, L302 & L303)• 1 Transfer Line (Single Laser, L301)• 1 Transfer Plate• Analog Sensors (Temp, Proximity)

ISR Prototype System TestISR Prototype System Test ISR Prototype System TestISR Prototype System Test


ISR Prototype System TestISR Prototype System TestISR Prototype System TestISR Prototype System Test

Data:• 1500+ Events Reconstructed• 3 Test Periods (July, Aug, Sept 2000)

Test DAQ (http://home.fnal.gov/~maeshima/alignment/daq/daq.html):

• custom programmed, C++, Window98, using 3 serial ports 1. SLM line DCOPS sensors, 2. Transfer line DCOPS sensors, 3. Agilent34970A for analog sensors and laser on/off control.

• No DSP centroid finding for this test. Each pixcel was read out.

Analysis Software:• Flap (First Level Analysis Program) written in C++: find centroid

of each DCOPS sensor, and do the first level analysis (stability of the laser centroids, etc.)

• CMS Object oriented Code for Optical Alignment (COCOA) is used to reconstruct positions of DCOPS sensors


ISR Test LayoutISR Test LayoutISR Test LayoutISR Test Layout


ISR Test GeometryISR Test GeometryISR Test GeometryISR Test Geometry

• Sensor locations for et2, et3, and es10 are given by the photogrammetry survey

• es9 was used due to survey errors in es10

• Transfer plate geometry was fixed by machining

• Sensors et1 es1 were located on the transfer plate• Provides link between Transfer and SLM lines

• Rotations of sensors are known within error limits of photogrammetry


Comments on ISR TestComments on ISR TestComments on ISR TestComments on ISR Test

Uncertainties:• Estimated Survey Errors

• 60 m local 120 m global

• Errors in COCOA Reconstruction• 220 m Systematic Errors < 15 m Statistical Errors (1500 Events)

General Remarks • Good reconstruction requires all 4 CCDs on MABS

and Transfer Plate SLM sensors• 3 CCDs required for all other sensors• Reconstruction is roughly independent of laser

direction• Reconstruction is independent of laser motions

• Laser ‘Jumps’ Do Not Affect Us


ISR Test ReconstructionISR Test ReconstructionISR Test ReconstructionISR Test ReconstructionTitle:

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Final ISR Results of COCOA reconstruction for July/August and September runs using es9 as the final reference sensor


ISR ResultsISR ResultsISR ResultsISR Results

Final Results :• System = 130 m

• Typical Reconstructions within 300 m of expected survey location

• Sensors outside 300 m range have understood errors


COCOA Simulation GoalsCOCOA Simulation GoalsCOCOA Simulation GoalsCOCOA Simulation Goals

Create Model CMS EMU Alignment System• DCOPS + Analog Sensors

• Integrate with Link and Barrel alignment

Evaluate Intrinsic System Errors• Chamber construction

• System design

Evaluate System Performance• Intrinsic Resolution

• Correlation of System Components

• Effects from component failure

Provide ‘First Draft’ of Reconstruction Software

Integration of Results into General Physics Simulation


Current Status (May 2001) (Robert Lee)

• Substantial Software Improvements• Extraction of Component Data from Endcap Muon

Production Drawings (Complete)

• SLM Lines and Endcap CSC Stations have been modeled

COCOA SimulationCOCOA SimulationCOCOA SimulationCOCOA Simulation

ME2/3/4 COCOA ModelSimulated COCOA SLM Line

kaori maeshima (fnal), alignment workshop at cern: may 17-18, 20011 endcap alignment status of...

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