1. University of Wisconsin-Madison
Transfer Line Fits
James N. Bellinger
University of Wisconsin-Madison
26-March-2010
James N. Bellinger 26-March-2010

2. Contents
Determine that my transfer plate centers are better than Dave’s
Hand fits give me something to validate Cocoa with
James N. Bellinger 26-March-2010

3. Whose TP centers are better?
Fit a set of SLMs with Dave’s and with my transfer plate centers at 0T
Find alignment pins positions wrt the disk
Compare with PG of pins wrt disk
Select ME-2 and ME-3 since I did not test them before
James N. Bellinger 26-March-2010

4. Alignment pin PG looks OK
Alignment pins
outline the SLMs
neatly.
One not measured
James N. Bellinger 26-March-2010

5. CMS X comparison X_mine-X_PG mean 0.1mm RMS 1.1mm X_dave-X_PG
ME-2/SLM2
fits poorly for Dave’s
#’s. Excluded here.
James N. Bellinger 26-March-2010

6. CMS Y and Z comparison Y_Dave-Y_PG Mean 1.2mm RMS 2.6mm Y_Mine-Y-PG
dZ is different:
clumpy; but note
that my clumps
are tighter
James N. Bellinger 26-March-2010

7. Conclusion
My calculated TP centers clearly result in better fits, even if the Cocoa model is not perfect
Note that the Cocoa model does not account for the different chamber distances from the SLM: these need to be introduced by hand
James N. Bellinger 26-March-2010

8. Reason for Z “clumps” Cross section of SLM
Cocoa model has all chambers
in the same plane: Wrong but
easily fixed up.
SLM line
248mm
Chambers are at different distances from the SLM laser
James N. Bellinger 26-March-2010

9. How Did I Generate Positions?
V direction
Zsensor
H direction
SLM DCOPS
Transfer DCOPS
Center of TP is here
Simple and short translation from
target to center
Three PG targets on top of DCOPS
James N. Bellinger 26-March-2010

10. Hand Fit Comparison
I create 12 independent fits for the transfer lines
2 for each transfer line, in the H and V directions (illustrated in next slide) native to the transfer line coordinate system
0T data from June 2009: Oleg pointed me to a range and a BFI search found some good data: no profiles, unfortunately
James N. Bellinger 26-March-2010

11. Transfer Line Coordinate system
V direction
CMS Y
H direction
Transfer
plate “X”
direction
varies with
position
CMS X
James N. Bellinger 26-March-2010

12. Hand Fits Illustration
Transfer Line 1
Horizontal (Rphi)
coordinate
Fit for two laser beams
and offsets for each
DCOPS
Position is wrt center of
Transfer Line
Blue points are raw
data
Black are fit positions
Distance between points is
invariant with fit
CMS Z (mm)
James N. Bellinger 26-March-2010

13. Changes in Cocoa Model Single Transfer Line Fix DCOPS internals
Fix DCOPS mounts
Fix disks
Widen TP error
James N. Bellinger 26-March-2010

14. Offsets for Line 1 MAB calcs not readily comparable yet Station
dX (mm)
Cocoa
Hand fit
dY (mm)
ME+3
2.520
-6.072
ME+2
2.474
-5.098
ME+1
1.220
-5.732
MAB+3
3.855
21.982*
MAB+1
3.528
25.469*
MAB-1
4.907
-0.214
MAB-3
4.546
1.540
ME-1
0.893
-5.361
ME-2
1.462
4.383
ME-3
-0.040
4.062
MAB calcs not readily comparable yet
James N. Bellinger 26-March-2010

15. First pass at residuals
No cuts on quality yet
570 microns for this,
440 if exclude point at -3
Residuals still far too
large, but agreement
with hand fit says we’re
on the right track.
James N. Bellinger 26-March-2010

16. Conclusions
Cocoa reproduces the Endcap part of the hand fit successfully
Possibly better, since it includes beam fan tilt instead of using averages
More work required on MAB: different sizes
If continue to get agreement, this will validate the Cocoa calculation
James N. Bellinger 26-March-2010

17. Plans Re-expand scope of fit
Find MABs I can use to constrain the lines
Check MABs for consistency
If agree, calculate Transfer Plate positions in X and Y
Review SLM models with Himali, and generate chamber positions
Converge on a plan for Z
Generate chamber Z and angles
James N. Bellinger 26-March-2010

18. BACKUP
James N. Bellinger 26-March-2010

19. Predicting MAB positions
34.78
MAB center to MAB sensor center (fixed)
Radial lever arm: center to DCOPS (fixed)
-33.14
MAB sensor center to target (fixed)
MAB center in Z
MAB y-angle rotation
Predicted target position
My predicted MAB center
16.328
29.950
23.078
36.226
20.019
How far from ideal is rear?
13.167
27.616
26.346
47.551
24.589
How far from PG is rear estimate?
Try working backward
Rear TP from photogrammetry
Distance to IP side of TP4
To IP side of TP3
To IP side of TP2
To IP side of TP1
Estimating MAB target gives
24.743
23.630
9.854
9.725
-9.419
11.192
Estimated MAB-found MAB
James N. Bellinger 26-March-2010