Radiation Damage Effects and Operation of the LHCb Vertex Locator

K. Akiba, M. Alexander, W. Barter, L. Bell, G. Bogdanova, S. Borghi, T. Bowcock, E. Buchanan, J. Buytaert, S. De Capua, S. Chen, P. Collins, A. Crocombe, E. Dall'Occo, C. Dean, F. Dettori, K. Dreimanis, G. Dujany, L. Eklund, T. EvansM. Gersabeck, T. Gershon, T. Hadavizadeh, J. Harrison, K. Hennessy, W. Hulsbergen, D. Hutchcroft, E. Jans, M. John, P. Kopciewicz, P. Koppenburg, G. Lafferty, T. Latham, A. Leflat, M. Majewski, F. Marinho, J. Mylroie-Smith, A. Oblakowska-Mucha, C. Parkes, A. Pearce, A. Poluektov, A. Pritchard, W. Qian, S. Redford, S. Richards, K. Rinnert, E. Rodrigues, P. Rodriguez, M. Schiller, M. Smith, T. Szumlak, M. Van Beuzekom, J. Velthuis, V. Volkov, H. Wark, A. Webber, M. Williams

Research output: Contribution to journalArticleResearchpeer-review

1 Citation (Scopus)

Abstract

Vertex locator (VELO) is a silicon microstrip detector situated around the interaction point in the large Hadron Collider beauty (LHCb) spectrometer at the Large Hadron Collider. The LHCb experiment is dedicated to studying charge conjugation and parity symmetry violation in the heavy flavor sector and rare decays of B mesons. The precise reconstruction of both the primary and secondary vertices, obtained by the VELO, is crucial in the selection of signal events containing b and c quarks and lifetime measurements. VELO consists of two retractable parts that operate at 8 mm from the interaction region. Its proximity to proton beams makes the LHCb VELO a place for studying radiation damage effects in silicon detectors in proton-proton and heavy-ion collisions. The latest results from radiation damage studies and their impact on the operation of the LHCb VELO after the first data-taking period (Run I) and the ongoing Run II are presented in this paper. The main macroscopic parameters, influenced by particle fluence, are described along with selected methods of their monitoring. All the results show that VELO sustains the impact of high fluence of radiation, and its performance will not change significantly until the end of Run II.

Original languageEnglish
Pages (from-to)1127-1132
Number of pages6
JournalIEEE Transactions on Nuclear Science
Volume65
Issue number5
DOIs
Publication statusPublished - May 2018
Externally publishedYes

Keywords

  • Depletion voltage
  • effective doping
  • large Hadron Collider beauty (LHCb)
  • leakage current
  • radiation damage
  • silicon detector
  • vertex locator (VELO)

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