CERN Accelerating science

Article
Report number	arXiv:1003.2492
Title	First Alignment of the Complete CMS Tracker
Author(s)	Meier, Frank (PSI, Villigen ; Zurich, ETH)
Collaboration	CMS Tracker Collaboration
Publication	2010
Imprint	15 Mar 2010
Number of pages	6
In:	Nucl. Instrum. Methods Phys. Res., A 636 (2011) pp.S177-S181
In:	7th International Symposium on the Development and Application of Semiconductor Tracking Detectors, Hiroshima, Japan, 29 Aug - 01 Sep 2009, pp.S177-S181
DOI	10.1016/j.nima.2010.04.106
Subject category	Detectors and Experimental Techniques ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	This conference proceeding presents the first results of the full CMS Tracker alignment based on several million reconstructed tracks from the cosmic data taken during the commissioning runs with the detector in its final position and magnetic field present. The all-silicon design of the CMS Tracker poses new challenges in aligning a complex system with 15\,148 silicon strip and 1440 silicon pixel modules. For optimal track-parameter resolution, the position and orientation of its modules need to be determined with a precision of about one micrometer. The modules, well illuminated by cosmic ray particles, were aligned using two track-based alignment algorithms in sequence in combination with survey measurements. The resolution in all five track parameters is controlled with data-driven validation of the track parameter measurements near the interaction region, and tested against prediction with detailed detector simulation. An outlook for the expected tracking performance with the first proton collisions is given.

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