First spatial alignment of the LHCb VELO and analysis of beam absorber collision data

S. Borghi, M. Gersabeck, C. Parkes, T. Szumlak, A. Affolder, K. Akiba, J. Anderson, M. Artuso, S. Basiladze, A. Bates, A. Bay, O. Behrendt, M. Van Beuzekom, A. Borgia, T. Bowcock, J. Buytaert, G. Casse, P. Collins, S. De Capua, H. De VriesS. Donleavy, L. Eklund, M. Luzzi-Ferro, R. Frei, K. Hennessy, T. Huse, D. Hutchcroft, E. Jans, M. John, T. Ketel, G. Lefeuvre, A. Leflat, F. Marinho, R. McNulty, R. Mountain, I. Mous, J. Smith-Mylroie, A. Noor, A. Papadelis, G. Patel, B. Rakotomiaramanana, K. Rinnert, E. Rodrigues, T. Shears, N. A. Smith, M. Tobin, S. Traynor, A. Van Lysebetten, B. Verlaat, J. Wang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A first alignment of the LHCb Vertex Locator has been obtained from beam induced tracks at the LHC. A 450 GeV/c protons were collided on a beam absorber during the LHC synchronisation tests of the anti-clockwise beam in August and September 2008. The resulting particle tracks have been reconstructed by the Vertex Locator. This was the first full reconstruction of tracks induced by the LHC beam. The quality of the data obtained is discussed. A total of 2200 tracks were reconstructed from the full data sample, and a first spatial alignment was obtained. The detector is aligned to an accuracy of 5mm in the sensor plane. The results confirm that all detector modules have not been displaced from their surveyed positions by more than 10μm. © 2010 Elsevier B.V.
    Original languageEnglish
    Pages (from-to)108-120
    Number of pages12
    JournalNuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
    Volume618
    Issue number1-3
    DOIs
    Publication statusPublished - 1 Jun 2010

    Keywords

    • Alignment
    • LHC
    • LHCb
    • Microstrip
    • Silicon
    • Vertex detector

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