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

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Presentation transcript:

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

CenterFrame Alignment references

VELO reference system IP rotu rotm rotd robdrobu Same for the left side right side

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

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 mm in x-direction Alignment with theodolites (precision ~300  m) Final precision of position in IP8

Fitted planes and normal vectors CenterFrame planes within 100  rad parallel Also parallel to beam lines with this accuracy