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Alignment. Daniel on behalf of WG. Sources of information. Photometry during installation Measurements done in “parking position”, untilted wheels Alignment sensors No Z measurement Need zero point (in time) and absolute ( x,y ) reference Zero point measurements are incomplete

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Presentation Transcript
alignment

Alignment

Daniel on behalf of WG

sources of information
Sources of information
  • Photometry during installation
    • Measurements done in “parking position”, untilted wheels
  • Alignment sensors
    • No Z measurement
    • Need zero point (in time) and absolute (x,y) reference
    • Zero point measurements are incomplete
    • Not taken at the same time as photometry
    • Measurements of wheels 2A and 2C weren’t written to data-base until July’10
    • Some calibration problems
  • Diodes in alignment corridors
    • Only 96 measurements out of 1500 units
    • ~40% not working
  • Goal (unachieved) : find well establish correlations between the incomplete sets of data
intermediate conclusion
Intermediate conclusion

After we solved the (not trivial) problems of inversions, it seems that:

The 4 wheels we could follow (either wrt to zero point measurement or to long term average) didn’t distort significantly over the years, except for two sectors in M3C

A request from the “analysts”: save raw information aside the results of computation of the into the data base

2 nd intermediate conclusion
2nd Intermediate conclusion

After all reasonable corrections one can think of, one can’t honestly say that we do see a rock-solid correlation between diodes and photometry measurements

prospects
Prospects
  • We should have “soon” photometry measurements of external wheels 3A and 3C
  • We need complete robust concomitant measurements fromsensors and diodes
  • No way to avoid alignment with tracking
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