plus endcap transfer lines
DESCRIPTION
Plus Endcap Transfer Lines. James N. Bellinger University of Wisconsin-Madison 11-Monday-2009. Available Data. End to end data w/ both lasers Only for PT1 Plus Endcap with Plus lasers 0T 3.8T Minus Endcap with Minus lasers Model not complete so I didn’t check closely. Plus Endcap SDF. - PowerPoint PPT PresentationTRANSCRIPT
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James N. Bellinger
University of Wisconsin-Madison
11-Monday-2009
Plus Endcap Transfer LinesPlus Endcap Transfer LinesPlus Endcap Transfer LinesPlus Endcap Transfer Lines
James N. Bellinger 11-May-2009
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Available Data
• End to end data w/ both lasers– Only for PT1
• Plus Endcap with Plus lasers– 0T
– 3.8T
• Minus Endcap with Minus lasers– Model not complete so I didn’t check closely
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Plus Endcap SDF
• Cocoa SDF for the entire Plus Endcap is ready– Except for piston Z-sensors and inclinometers
• This work was done with a limited set of measurements: only transfer line data
• Complete set of measurements took 30 minutes to execute
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Relative positions
Without some absolute reference, the endcap could be on Mars, but we can still get relative displacements.
We also have a handle on torsion of the endcap.
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Testing the results
• Pre- and post-CRAFT survey measurements of YE disk x/y and z-rotations
• Hand calculation trying to fit 30 parameters
• Cocoa results
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Photogrammetry
YE+1
Pre
YE+2
Pre
YE+3
Pre
YE+1
Post
YE+2
Post
YE+3
Post
X mm 1.46 0.17 1.55 0.58 -0.15 0.59
Y mm -0.32 0.78 0.56 -1.37 0.57 -0.04
Rz mrad
-0.50 -0.40 0.20 -0.43 -0.46 0.18
From CMS-SG-UR-0124 Changed sign convention for Rz
Reported error 0.3mm on position, 0.1mrad on angles
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Relative Photogrammetry
• Fix YE+3 at (0,0) with no rotation
• Assume entire shift happened at start of CRAFT, and use Post-CRAFT data
YE+1-YE+3
YE+2-
YE+3
dX mm -0.01 -0.74
dY mm -1.33 0.61
dRz mrad
-0.61 -0.64
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Hand calculation
• Minimize chi-squared of deviations of laser hit positions from data– 30 parameters, PARI
matrix code
– Needs tweaking
• Does not agree w/ photogrammetry
YE+1-YE+3
YE+2-
YE+3
dX mm -1.03 -1.08
dY mm 1.28 2.07
dRz mrad
-0.98 -0.86
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Cocoa on Plus Endcap
• Changed hierarchy to be disk-based
• Data from 0T
• Fixed YE+3 position, rotations
• X/Y do not agree with photogrammetry
• Rz are consistent with photogrammetry values, similar to hand calc.
YE+1-YE+3
YE+2-
YE+3
dX mm 0.97 0.59
dY mm -1.22 -1.51
dRz mrad
-0.73 -0.76
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Comparison
Agreement is not very goodHand calc wrong sign?
PG did not accurately estimate our known Z-sensor displacement
PGHandCocoa
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Transfer Plate Displacements
• At each transfer plate, compare shift between YE+3 and YE+2 positions
• Ignore Z, Rx, and Ry
PG Hand Cocoa
TP1 3.9 4.0 7.1
TP2 3.0 5.0 6.6
TP3 4.6 7.3 5.2
TP4 5.4 8.5 3.9
TP5 5.5 8.0 4.7
TP6 4.8 6.0 6.3
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Transfer Plate Displacements
• At each transfer plate, compare shift between YE+2 and YE+1 positions
• Ignore Z, Rx, and Ry
• BUT! See next slide
PG Hand Cocoa
TP1 1.9 1.7 0.6
TP2 2.0 1.4 0.4
TP3 2.2 0.7 0.3
TP4 2.3 0.2 0.4
TP5 2.2 1.0 0.6
TP6 2.0 1.5 0.7
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Real World MeasurementReal World Measurement
James N. Bellinger 11-May-2009
PT 2 betweenYE+1 & YE+2Rod misses by~10mm
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None predict thisNone predict this
James N. Bellinger 11-May-2009
PG deviations between YE+1 and YE+2 are larger than those from the hand calculation or from Cocoa, but nothing even comes close to predicting the 10mm shift at PT2