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Precision Alignment of VELO at IP8: Implementation and Results

This document details the alignment process of the VELO detector at IP8, focusing on the alignment parameters and achieved precision. The initial installation achieved approximately 1 mm precision, with final adjustments including a z-axis rotation of 0.75 mrad and a y-direction shift of -0.5 mm. The x-direction was adjusted by +0.25 mm, ensuring that the alignment planes were parallel to the beam lines within 100 mrad. The alignment process utilized theodolites for accurate measurements, essential for precise positioning in the LHCb physicist coordinate system.

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Precision Alignment of VELO at IP8: Implementation and Results

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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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