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Title: Commissioning of the LHCb VELO detector and the performance of irradiated VELO sensors in a proton testbeam
Author: Noor, Abdirizack
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2012
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The Large Hadron Collider (LHC) is a proton proton collider at the European Organisation for Nuclear Research (CERN). The LHCb experiment is one of four experiments at the LHC. It will exploit the copious amounts of bb pairs produced to make precision measurements of the properties of B-mesons. The real time identification of B-mesons is provided by the Vertex Locator (VELO), which is a silicon microstrip tracking and vertexing detector at the LHCb experiment. Due to the close proximity of the VELO to the interaction point, it operates in a harsh non-uniform radiation environment. To understand the effects of radiation damage on VELO sensors, a VELO RR module was irradiated to a fluence equal to ~ 6 years of running at nominal conditions at the innermost radius of the VELO sensors. The module was investigated in a 120 GeV proton testbeam at the MTEST facility at FERMILAB. Due to the arrangement of the VELO sensors the irradiation will be non-uniform, which can create a transverse electric field in the silicon sensors. The transverse electric field can cause a shift in the cluster reconstruction position. The effect of the transverse electric field on the cluster reconstruction posicion are presented and shown to be . An estimated resolution of non-uniformly irradiated VELO R sensors is made and measured to be ~ 10/um for both the n-in-n and n-in-p sensors in the RR module.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available