Abstract
LHCb is a forward spectrometer experiment dedicated to the study of new physics in the decays of beauty and charm hadrons produced in proton collisions at the Large Hadron Collider (LHC) at CERN.The VErtex LOcator (VELO) is the microstrip silicon detector surrounding the interaction point, providing tracking and vertexing measurements. The upgrade of the LHCb experiment, planned for 2018, will increase the luminosity up to 2×1033cm−2s−1 and will perform the readout as a trigger-less system with an event rate of 40MHz. Extremely non-uniform radiation doses will reach up to 5×10151MeVneq/cm2 in the innermost regions of the VELO sensors, and the output data bandwidth will be increased by a factor of 40. An upgraded detector is under development based in a pixel sensor of the Timepix/Medipix family, with 55×55μm2 pixels. In addition a microstrip solution with finer pitch, higher granularity and thinner than the current detector is being developed in parallel.The current status of the VELO upgrade program will be described together with recent testbeam results.
Highlights
The current status of the VErtex LOcator (VELO) upgrade program will be described together with recent testbeam results
Each sensor has its own hybrid circuit, and it is glued onto a thermal pyrolytic graphite (TPG) foil which provides a thermal highway for the module
The TPG foil is coated with carbon fibre to give mechanical support to the module
Summary
The LHCb [1] experiment is designed to exploit the enor- mous production cross sections of b and c hadrons in proton collisions at the LHC. The VErtex LOcator [2] is the silicon detector surrounding 49 the LHCb interaction point It is located only 7 mm from the beam axis during normal operation and measures very precisely the primary vertex and the decay vertices. It consists of two mobile detector halves with 21 modules each (Fig. 1(b)). Despite the radiation damage no significant performance degradation has been shown in the installed VELO, providing a decay time resolution of ∼ 50 fs and a point resolution of only 4 μm in the region of 40 μm pitch. More detailed information about the VELO performance can be found in [6]
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