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Status VELO alignment

Status VELO alignment. Alignment at IP8. Jo van den Brand Frans Mul June 2, 2006. Alignment references. CenterFrame. VELO reference system. right side. -335. 785. rotd. rotu. rotm. 555. IP. -555. robu. robd. Same for the left side. Coordinates.

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Status VELO alignment

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  1. Status VELO alignment • Alignment at IP8 Jo van den Brand Frans Mul June 2, 2006

  2. Alignment references CenterFrame

  3. VELO reference system right side -335 785 rotd rotu rotm 555 IP -555 robu robd Same for the left side

  4. Coordinates In LHCb Physicist Coordinate System (z-along beam line) x-coordinate includes 20 mm offset from alignment spheres

  5. Final precision of position in IP8 Alignment Center Frame in IP8 Initial installation of VELO was carried out to about 1 mm precision Final alignment required - rotation around z-axis of 0.75 mrad - shift of CF by -0.5 mm in y-direction - rotation around y-axis of 0.30 mrad - shift by +0.25 mm in x-direction Alignment with theodolites (precision ~300 mm)

  6. CenterFrame planes within 100 mrad parallel Also parallel to beam lines with this accuracy Fitted planes and normal vectors

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