1

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

2

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

4

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.

5

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

6

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