CERN Accelerating science

LHCb Note
Report number	LHCb-2005-101 ; CERN-LHCb-2005-101
Title	LHCb VELO software alignment, Part I : the alignment of the VELO modules in their half boxes
Author(s)	Viret, S (Glasgow U.) ; Parkes, C (Glasgow U.) ; Petrie, D (Glasgow U.)
Submitted by	[email protected] on 12 Dec 2005
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	Software alignment of the Vertex Locator (VELO) is a critical stage of the LHCb alignment strategy. This note presents a demonstration of a potential algorithm to satisfy the requirements of this stage. A fast track-based software alignment procedure is described. This method is based on non-iterative least squares fitting. The first step of the algorithm, the alignment of the VELO modules in their half-boxes, is fully described and results obtained with simulated events are presented and discussed. The approach described in this document, and the tools developed, are also applicable to the alignment of the other LHCb sub-systems and the global relative alignment of the sub-detectors.
Copyright/License	Preprint: (License: CC-BY-4.0)

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