Abstract
The Vertex Locator of the LHCb experiment is a dedicated subdetector for the reconstruction of primary and secondary vertices in b-hadron decays. The vertex detector features two halves with 21 modules each, mounted on retractable bases. Each module consists of two half-disk silicon micro-strip sensors measuring hits in R and Φ coordinates. The strip pitch ranges from 40 to about 100 μ m . A vacuum box with a 300 μ m thick aluminium foil shields the sensors from the wakefields of the proton beams which are passing at a distance of 8 mm from the active area of the sensors. Because of the harsh non-uniform radiation environment we opted for n-on-n strips in diffusion oxygenated float zone silicon. The current status of the vertex detector, which has recently entered the commissioning phase, will be discussed. Given the limited lifetime of the detector due to the radiation environment, developments for a detector replacement with n-on-p type modules have already started. Possible upgrade scenarios for the vertex detector will also be discussed in view of the luminosity upgrade which is currently being considered for the LHCb experiment. The options include novel detector technologies and geometries.
Highlights
The LHCb experiment is a precision experiment at the Large Hadron Collider (LHC) at CERN to study CP-violation using b-hadron decays
LOcator (VELO) shown in Fig. 1 is a dedicated subdetector for the reconstruction of primary and secondary vertices with a resolution of several tens of micrometers. It consists of two halves, each with 21 silicon micro-strip modules, mounted on a base which can be moved outwards by 30 mm to allow for injection and ramping of the LHC beams which is expected to take place twice a day
Two dedicated PileUp modules mounted in the backward direction are used in the trigger for vetoing bunch crossings with multiple primary interactions
Summary
The LHCb experiment is a precision experiment at the Large Hadron Collider (LHC) at CERN to study CP-violation using b-hadron decays. It consists of two halves, each with 21 silicon micro-strip modules, mounted on a base which can be moved outwards by 30 mm to allow for injection and ramping of the LHC beams which is expected to take place twice a day. The silicon detectors are placed in a secondary vacuum which is separated from the primary (beam) vacuum by two RF-boxes constructed from 300 μm thick Aluminium foils.
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