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Status of the ITS Alignment Monitoring System

Status of the ITS Alignment Monitoring System. First results By Bjørn S. Nilsen The Ohio State University. Outline. ITS and ITSAMS Geometry Camera Sport measurements Camera Calibration ITSAMS raw measurements ITS geometry effects?. Camera spot analysis.

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Status of the ITS Alignment Monitoring System

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  1. Status of the ITS Alignment Monitoring System First results By Bjørn S. Nilsen The Ohio State University

  2. Outline • ITS and ITSAMS Geometry • Camera Sport measurements • Camera Calibration • ITSAMS raw measurements • ITS geometry effects?

  3. Camera spot analysis • Camera exposure… set for best image. • 25 images taken in series • Image smoothing to remove intensity anomalies • Ring centers found for a series of intensity thresholds. • Remove clearly anomalies centers • Return Mean center and RMS. • Means & errors computed from all 25 images

  4. Camera ResolutionPixels • Camera 0, RMSx=7.39±0.18, RMSy=7.48±0.18. • Camera 1, RMSx=1.91±0.04, RMSy=1.76±0.04. • Camera 3, RMSx=7.52±0.24, RMSy=5.96±0.19.

  5. Image Centers

  6. Calibration • Data taken from Test-bench setup • Image centers used old algorithm • Still some problems with test-bench setup

  7. Image location • Data with L3 on in solid markers • Camera center at 0,0.

  8. L3 Magnet Tests, Frontabsorber Movement In order to explain the vertical movement of the front absorber nose by 2.4mm, the top fixation point of the FASS would have to move by d=3.7mm. It seemed very improbable that the heavy magnet crown, that the FASS is attached to, is moving at all. 1/29/2008 W. Riegler TB Presentation 8

  9. Central Beampipe vs. FA Lift beampipe (ITS) before TPC movement ITSAMS Installed/aligned Beampipe (ITS) hanging on TPC +1 TRD, +8 TOF  1.5*9= 14T  2.3mm expected B-Field tests mm 0.5 T 0.5 T 0.5 T + dipole 0.17 T 0.17 T 0 T 0 T 0 T +1 TOF ITSAMS Realigned March Beampipe on ITS rail 1/29/2008 W. Riegler TB Presentation 9

  10. Spot position By day • Clearly spot position shifted when L3 field is on. • Timing correlation not 100%. images (file dates), Magnet (dcs data base).

  11. ITSAMS Mirrors Top View Side View Many Cables

  12. IT’S A-Side View from Mirror 0 View of Mirror 0 mounting

  13. ITS C-side

  14. Stress free Mounting

  15. ITS mounting - 3 point mount - Stress Free

  16. Status • Low Voltage on USB hub improved • Better reliability of camera communications • Low Voltage IP address conflict fixed • ITSAMS control system still improving • Automation of image taking and analysis to come • Computation of ITS movement being debugged. • Wednesday L3 magnet on, run ITSAMS

  17. Spot Camera 0 Camera 1 Missing Camera 2 Camera 3

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