Performance of the LHCb vertex detector alignment algorithm determined with beam test data

M. Gersabeck, S. Viret, C. Parkes, K. Akiba, M. Artuso, J. Borel, T. J.V. Bowcock, J. Buytaert, P. Collins, R. Dumps, L. Dwyer, D. Eckstein, L. Eklund, M. Ferro-Luzzi, R. Frei, G. Haefeli, K. Hennessy, T. Huse, E. Jans, M. JohnT. J. Ketel, A. Keune, T. Laštovička, R. Mountain, N. Neufeld, A. Papadelis, S. Stone, T. Szumlak, M. Tobin, M. Van Beuzekom, A. Van Lysebetten, T. W. Versloot, H. de Vries, J. C. Wang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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 μ m 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 μ m is obtained for the sensors. The alignment of the system is shown to be stable at better than the 10 μ m level under air to vacuum pressure changes and mechanical movements of the assembled system.

Original languageEnglish (US)
Pages (from-to)164-171
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number2
StatePublished - Nov 1 2008


  • Alignment
  • LHCb
  • Vertex detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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