The LHCb VELO: Status and upgrade developments

A.G. Bates, J. Kennedy, T.J. Ketel, M. Moll, J. Palacios, N. Tuning

Research output: Contribution to JournalArticleAcademicpeer-review


The VErtex LOcator (VELO) is the silicon microstrip vertexing and triggering sub-detector of the LHCb experiment. It consists of a series of forward disks with the active region extending to just 8 mm from the LHC beams. The current status of the VELO is presented. Due to the high radiation environment, the VELO may have to be replaced after some years, possibly with new materials. A candidate material is Czochralski silicon. We present here promising new results on the first test beam of a large, high resistivity Czochralski microstrip silicon detector read out with LHC speed electronics. The performance was studied before and after irradiation with high energy protons. A signal to noise of over 20:1 was obtained from the detector and significant charge collection efficiencies were measured at relatively modest voltages after a fluence of 4.3 × 10
Original languageEnglish
Pages (from-to)1689-1693
JournalIEEE Transactions on Nuclear Science
Issue number3
Publication statusPublished - 2006

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