Photogrammetry for CSC Panels

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Photogrammetry for CSC Panels
Yuriy Pischalnikov (UCLA)
for FNAL-Site EMU CSC production team
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Photogrammetry of CSC Panels

• How to transfer position of Strips artwork from
  CSC panels to out-side world ?
• Alignment marks
• Retro-Reflective targets, nesting into Alignment
  Marks Grooves (Photogrammetry whole chamber)

R-R-target size (custom order from HUBS)8/ piece
shaft Diam- 40mils, length -200mils diameter of
R-R dot -125 mils
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Test board. CMM measurements of grooves position.
1. We made a test board which is copy of narrow
side of Anode Panels 2. Made measurements at CMM
location of alignment marks
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Optical (Photogrammetry) measurements of RR
targets on test board.
3.Measured targets (with machined to small
diameter of shank) 4. Glued (carefully as we
can) targets to alignment groove (or design some
tool) 5. With help from PPD alignment team made
photogrametry of test board
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CMM vs. Photogrammetry
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Location of Alignment Grooves on Panels
New alignment marks for Anode and IC
(14groove68groove)
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Alignment marks vs.Strip position (CMM
measurements)

• Accuracy of strips position
• measurements
• (Errors Budget)
• 1. Mark position measuring device gtgt /-2mils
  s14mils/sqrt(12) 1.2mils
• 2. Align.marks strips (Gerber error) gtgt
  0/-5mils s25mils/sqrt(12) 1.4mils
• 3. RR targets measurements gtgtgt1/-1mils
  s32mils/sqrt(12)0.6 mils
• ----------------------------------------
• stotalSQRT(s1 2 s2 2 s3 2 )2mils(50mm)

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Photogrammetry for CSC Panels

• Summary
• From test with 6 RR targets on real panel we got
  accuracy better than 1/-0.5mils
• There are error between of alignment marks and
  strip position on the level of 0/-5mils
• (we are working to figure out why?)
• Total budget of accuracy of strips position vs.
  Alignment Pin near 2mils (50mm)