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ME+1 hSLM Fits

ME+1 hSLM Fits. James N. Bellinger University of Wisconsin-Madison 3 December 2008. Summary. Fits converge using DCOPS data Link disk fit positions Link laser sensor data Z1 (distance to MAB) sensor data Field on and field off data from CRAFT Small bug remains with Z positions. Model.

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ME+1 hSLM Fits

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  1. ME+1 hSLM Fits James N. Bellinger University of Wisconsin-Madison 3 December 2008

  2. James N. Bellinger 3-December-2008 Summary • Fits converge using • DCOPS data • Link disk fit positions • Link laser sensor data • Z1 (distance to MAB) sensor data • Field on and field off data from CRAFT • Small bug remains with Z positions

  3. James N. Bellinger 3-December-2008 Model DCOPS laser Z1 sensor: Transfer plate to MAB Illuminates 4 DCOPS ME+1/3 MAB YE+1 Need to refine Z at this point x 6 ME+1/2 Measures ME+1/2 Measures MAB Ignore ME+1/1 in this model Link laser: prism makes 2 lines

  4. James N. Bellinger 3-December-2008 Some massaging required Raw sensor values for PT1 Z1 Distance from Transfer to MAB Select an appropriate region, and use the average value. There is some drift Ramping field 3.8T

  5. James N. Bellinger 3-December-2008 Positions • Photogrammetry targets • Cocoa Field Off (at end of CRAFT) to PG values • Direct comparison only • Chamber centers • Field Off to Field On • Direct comparison only • Field Off to Ideal • Direct comparison and removing overall shifts • Field On to Ideal • Direct comparison and removing overall shifts

  6. James N. Bellinger 3-December-2008 PG Targets: ME+1/2 1.0mm 1.1mm 1.0mm 1.3mm 0.8mm X Y 1.0mm

  7. James N. Bellinger 3-December-2008 PG Targets: ME+1/2 Z PROBLEM: Inconsistency in the ideal target positions, and Cocoa Z definition. Investigating; should be solved by end of the day.

  8. James N. Bellinger 3-December-2008 PG Targets: ME+1/3 0.4mm 0.4mm 1.6mm 1.0mm Y X 0.7mm 1.4mm

  9. James N. Bellinger 3-December-2008 PG Targets: ME+1/3 Z PROBLEM: Inconsistency in the ideal target positions, and Cocoa Z definition. Investigating; should be solved by end of the day.

  10. James N. Bellinger 3-December-2008 Chamber Centers • Ideal position • Cocoa fit with field on • Cocoa fit with field off • No centers generated from PG targets yet for ME+1

  11. James N. Bellinger 3-December-2008 Chamber centers ME+1/2 Difference between field off and field on fit positions Center pulled in in Z by 8.1mm

  12. James N. Bellinger 3-December-2008 Chamber centers ME+1/3 Difference between field off and field on fit positions No significant shift in chamber center in Z. Needs check!

  13. James N. Bellinger 3-December-2008 Chamber centers in Z Ring 2 fits for Z Ring 3 fits for Z

  14. James N. Bellinger 3-December-2008 Overall Shifts • If a ring is rotated, its PG and chamber positions will reconstruct away from the ideal. • Direct comparison of PG and COCOA fits is misleading because these rotations aren't taken into account—precision is better than it appears.

  15. James N. Bellinger 3-December-2008 Removing Overall Shifts • Want to know shift relative to ring • Subtract off the overall misalignment of the disk/ring • Look at relative shifts, esp vs position around ring • Measures variation in relative mounting • MuonGeometryArrange tool • Calculates shifts of chambers, builds an overall shift of the ring • Shifts the ring and re-compares chamber shifts • Bug prevents comparing incomplete geometries to each other

  16. James N. Bellinger 3-December-2008 Cocoa vs Ideal ME+1/2 Remaining deviations after ring realignment Plot of deviations as vectors starting from chamber centers. Scale at top is length of longest deviation. Deviations of order mm from field off to field on. NOTE that the scale changes!

  17. James N. Bellinger 3-December-2008 Cocoa vs Ideal ME+1/3 Deviations of order 0.1mm from ideal, and from field off to field on

  18. James N. Bellinger 3-December-2008 Cocoa vs Ideal ME+1/2 Z Variation in Z around the ring after ring shift is removed

  19. James N. Bellinger 3-December-2008 Cocoa vs Ideal ME+1/3 Z Variation in Z around the ring after ring shift is removed

  20. James N. Bellinger 3-December-2008 Z shifts around ring • No obvious pattern to relative Z shifts • Shifts are of order a few hundred microns

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