Alignment procedure of the LHCb Vertex Detector

Details Alignment procedure of the LHCb Vertex Detector Alignment procedure of the LHCb Vertex Detector

2008-07-31

arxiv.org/abs/0807.5067v1

Nucl.Instrum.Meth.A596:157-163,2008

Physics

Instrumentation and Detectors

accepted for publication in NIMA

Scientific paper

10.1016/j.nima.2008.07.153

LHCb is one of the four main experiments of the Large Hadron Collider (LHC) project, which will start at CERN in 2008. The experiment is primarily dedicated to B-Physics and hence requires precise vertex reconstruction. The silicon vertex locator (VELO) has a single hit precision of better than 10 micron and is used both off-line and in the trigger. These requirements place strict constraints on its alignment. Additional challenges for the alignment arise from the detector being retracted between each fill of the LHC and from its unique circular disc r/phi strip geometry. This paper describes the track based software alignment procedure developed for the VELO. The procedure is primarily based on a non-iterative method using a matrix inversion technique. The procedure is demonstrated with simulated events to be fast, robust and to achieve a suitable alignment precision.

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