Performance of the LHCb Vertex Detector Alignment Algorithm determined with Beam Test Data

Details Performance of the LHCb Vertex Detector Alignment Algorithm determined with Beam Test Data Performance of the LHCb Vertex Detector Alignment Algorithm determined with Beam Test Data

2008-07-31

arxiv.org/abs/0807.5069v1

Nucl.Instrum.Meth.A596:164-171,2008

Physics

Instrumentation and Detectors

accepted for publication in NIMA

Scientific paper

10.1016/j.nima.2008.07.154

LHCb is the dedicated heavy flavour experiment at the Large Hadron Collider at CERN. The partially assembled silicon vertex locator (VELO) of the LHCb experiment has been tested in a beam test. The data from this beam test have been used to determine the performance of the VELO alignment algorithm. The relative alignment of the two silicon sensors in a module and the relative alignment of the modules has been extracted. This alignment is shown to be accurate at a level of approximately 2 micron and 0.1 mrad for translations and rotations, respectively in the plane of the sensors. A single hit precision at normal track incidence of about 10 micron is obtained for the sensors. The alignment of the system is shown to be stable at better than the 10 micron level under air to vacuum pressure changes and mechanical movements of the assembled system.

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