Charge collection properties of prototype sensors for the LHCb VELO upgrade

R. Geertsema*, Kazu Akiba, Martin van Beuzekom, Emma Buchanan, C. Burr, W Byczynski, P Collins, E Dall'Occo, T Evans, V Franco Lima, K. Heijhoff, P Kopciewicz, F Marinho, Eugenia P Price, B Rachwal, Sophie E Richards, Daniel Saunders, H Schindler, H Snoek, T SzumlakP Tsopelas, Jaap J Velthuis, M.R.J. Williams

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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An extensive sensor testing campaign is presented, dedicated to measuring the charge collection properties of prototype candidates for the Vertex Locator (VELO) detector for the upgraded LHCb experiment. The charge collection is measured with sensors exposed to fluences of up to 8×1015 1 MeV neq cm-2, as well as with nonirradiated prototypes. The results are discussed, including the influence of different levels of irradiation and bias voltage on the charge collection properties. Charge multiplication is observed on some sensors that were nonuniformly irradiated with 24 GeV protons, to the highest fluence levels. An analysis of the charge collection near the guard ring region is also presented, revealing significant differences between the sensor prototypes. All tested sensor variants succeed in collecting the minimum required charge of 6000 electrons after the exposure to the maximum fluence.
Original languageEnglish
Article numberP02029
Number of pages21
JournalJournal of Instrumentation
Issue number2
Publication statusPublished - 23 Feb 2021


  • Radiation-hard detectors
  • Radiation damage to detector materials (solid state)
  • Hybrid detectors
  • Solid state detectors

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