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University of Wisconsin-Madison
Transfer Lines James N. Bellinger University of Wisconsin-Madison 26-June-2009 James N. Bellinger 26-June-2009
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Transfer Lines: Positions
of 12 DCOPS Lasers at ME+4 and ME-4 shine axially Establish relative X,Y of the transfer plates, and thus the SLM ends SLM example Y X James N. Bellinger 26-June-2009
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DCOPS along Transfer Lines
Mounted on MABs Minus Endcap Plus Endcap CMS Z Endcap DCOPS are mounted to the disks James N. Bellinger 26-June-2009
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CRAFT Results The laser direction control program failed. Only one half of one Transfer Line was complete Each side has a crosshair laser pair. Only one of each pair threaded across completely Impossible to fit Transfer Lines. James N. Bellinger 26-June-2009
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Data from Complete Transfer Line
Taken at 05:40 23-June Lasers thread through Leave out MAB stations for the time being Fit and look for disk positions James N. Bellinger 26-June-2009
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Limitations MAB positions do not measure YB disks w/o additional information Transfer Plate calibrations are not included here James N. Bellinger 26-June-2009
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Cocoa Fit: Both lasers, both endcaps, YE+3 and YE-3 fixed
Name X shift (mm) Y shift (mm) Zrot (mrad) YE+1 -2.17 1.16 0.38 YE+2 -0.59 -0.05 0.67 YE+3 0 (fixed) YE-1 -1.66 0.00 YE-2 0.21 -0.34 -0.53 YE-3 23-June All lasers done Name X shift (mm) Y shift (mm) Zrot (mrad) YE+1 -1.73 1.72 0.29 YE+2 -0.38 0.38 0.62 YE+3 0 (fixed) YE-1 -2.82 0.49 -0.01 YE-2 -0.05 0.54 -0.69 YE-3 Compare: 17-June 2 lasers done James N. Bellinger 26-June-2009
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Cocoa Fit: Both lasers, both endcaps, YE+3 fixed
Name X shift (mm) Y shift (mm) Zrot (mrad) YE+1 -1.68 1.62 0.47 YE+2 -0.35 0.16 0.72 YE+3 0 (fixed) YE-1 0.65 2.07 0.45 YE-2 2.77 2.00 -0.03 YE-3 2.81 2.57 0.59 23-June All lasers done Name X shift (mm) Y shift (mm) Zrot (mrad) YE+1 -0.47 1.00 0.28 YE+2 0.01 0.62 YE+3 0 (fixed) YE-1 3.29 -2.27 -0.09 YE-2 6.70 -2.52 -0.78 YE-3 7.33 -3.37 -0.10 Compare: 17-June 2 lasers done James N. Bellinger 26-June-2009
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Average Data over 9 events
Name X shift (mm) Y shift (mm) Zrot (mrad) YE+1 (-2.17) 0.31 (1.16) 0.33 (0.38) YE+2 -1.12 (-0.59) -0.10 (-0.05) 0.76 (0.67) YE+3 0 (fixed) YE-1 -1.81 (-1.66) -1.11 (-0.05) 0.16 (0.00) YE-2 -0.42 (0.21) (-0.34) -0.49 (-0.53) YE-3 YE+3/YE-3 fixed Name X shift (mm) Y shift (mm) Zrot (mrad) YE+1 -0.03 (-1.68) 0.44 (1.62) 0.37 (0.47) YE+2 -0.67 (-0.35) -0.05 (0.16) 0.79 (0.72) YE+3 0 (fixed) YE-1 2.19 (0.65) -0.55 (2.07) 0.32 (0.45) YE-2 4.08 (2.77) -0.20 (2.00) -0.31 (-0.03) YE-3 4.80 (2.81) 0.66 (2.57) 0.22 (0.59) RED: single event only: compare YE+3 only fixed James N. Bellinger 26-June-2009
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What’s wrong? Is it fixable?
Shadowing is not a huge problem: paired redundant CCDs mean the other one is OK Non-optimal filters Nothing we can do about this now Relative only; no CMS reference yet Residuals aren’t good Investigating Fit stability for positions not wonderful Partly a function of 4) above Partly readout glitch issue (investigating) James N. Bellinger 26-June-2009
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Geometry needs work Using PG positions for transfer
plates relative to the disks WORSE! Using ideal geometry for transfer plate positions relative to the disks DCOPS residuals James N. Bellinger 26-June-2009
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Plans Use Link fits and sensors in ME1/2 and the outer MABs to get CMS reference X/Y Define DCOPS wrt MABs and MABs wrt tracker to pin down relative positions Understand why large residuals (RMS=3.7mm) !! James N. Bellinger 26-June-2009
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BACKUP MATERIAL James N. Bellinger 26-June-2009
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Profile with no major variation
Highest profile is plotted first. Green dotted is usually last, unless it was highest, in which case red dotted was last to be plotted. Whatever was first is usually impossible to see because later plots obscure it. James N. Bellinger 25-June-2009
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Variation in laser Intensity
in peak height James N. Bellinger 26-June-2009
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Known laser profile problem
James N. Bellinger 26-June-2009
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Known Profile Problem Odd coincidence that both beams
are similarly bad James N. Bellinger 26-June-2009
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Laser Drift with time Position shifts by about 1mm
More of an opportunity than a problem: lets us check fit stability James N. Bellinger 26-June-2009
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Ideal View From Crosshair Laser
James N. Bellinger 26-June-2009
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Real World James N. Bellinger 26-June-2009
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Shadowing of One CCD Leaves Other CCD OK
17-June data James N. Bellinger 26-June-2009
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