Silicon Tracker Software
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Silicon Tracker Alignment

The alignment of the tracking system is logically split up into the alignment of the VELO and the alignment of the T-stations. Both systems can reconstruct tracks independently (VELO- and T-seeding). These tracks can be used to align each system individually. Then, they can be linked together and aligned by matching their seed tracks. The alignment of the TT detector is somewhat different as the four layers are not enough to determine the (4 or 5) track parameters. Therefore, the TT alignment will rely on tracks from the VELO, T-stations, or both.

General links to LHCb alignment

• LHCb Aligmnent Twiki
• Steve Blusks global alignment page
• Jan's alignment twiki (hints on running framework)
• Glasgow VELO alignment
• The Conditions Database webpage and the TWiki CondDB page
• Juan Palacios Geometry Framework Twiki

Notes on alignment

• Momentum resolution robustness studies with a misaligned Outer Tracker, I. Mous, LHCb-2006-045, 03 Aug 2006.
• OT internal toy studies, J. Nardulli, LHCb-2006-043, 11 Jul 2006.
• LHCb Alignment strategy , Baldini et al., LHCb-2006-035, 20 Jun 2006.
• Robustness with misaligned OT, E. Bos and J. Nardulli, LHCb-2006-020, 18 May 2006.

T-Station Alignment Presentations

• OT alignment toy MC, J. Nardulli, Tracking and Alignment Workshop, Lausanne, 21 March 2006.
• IT Aligment toy MC, K. Vervink, ST meeting, 25 Apr 2006
• Robustness of IT versus misalignment, K. Vervink, Glasgow Tracking and Alignment Workshop, 01 Nov 2005.
• The first Joint OT/IT meeting held in Zurich in April 2005.
• The second Joint OT/IT meeting held at NIKHEF in September 2005.

Mechanical constraints

• TT database with the data from the module metrology.
• IT database.
• TT rails alignment, J. van Tilburg, ST meeting, 12 Sep 2006.
• IT Box assembly (1) and (2), M.-O. Bettler, ST meetings in Villars (20/07/06) and CERN (17/10/06).
• TT mechanical constraints, R. Bernhard, Glasgow Tracking and Alignment Workshop, 01 Nov 2005.

External links

• Millipede: General talk by Blobbel, his webpage, and an interface to C
• Paper on alignment using the Kalman filter by Fruhwirth
• Alignment in ATLAS
• CDF note on alignment
• Alignment in HERA-B: webpage and documentation.