Abstract
The LHCb Outer Tracker is a gaseous detector covering an area of 5 × 6 m2 with 12 double layers of straw tubes. Based on data of the first LHC running period from 2010 to 2012, the performance in terms of the single hit resolution and efficiency are presented. Details on the ionization length and subtle effects regarding signal reflections and the subsequent time-walk correction are given.The efficiency to detect a hit in the central half of the straw isestimated to be 99.2%, and the position resolution is determined tobe approximately 200 μm, depending on the detailed implementationof the internal alignment of individual detector modules. The OuterTracker received a dose in the hottest region corresponding to0.12 C/cm, and no signs of gain deterioration or other ageing effectsare observed.
Highlights
The LHCb detector is a single arm spectrometer aimed at measuring bottom and charm decays produced at pp collisions at the LHC
The latter Outer Tracker (OT) is a gaseous detector covering an area of 5 × 6 m2 with 12 double layers of straw tubes and is shown in figure 1
More details are given on the ionization length and on subtle effects regarding signal reflections and the subsequent time-walk correction
Summary
The momentum of charged particles is measured by accurately determining the trajectory with the Vertex Locator before the magnet, and tracking detectors behind the magnet. The tracking system behind the magnet consists of silicon strip detectors close to the beampipe, and a straw tube detector in the outer parts. The latter Outer Tracker (OT) is a gaseous detector covering an area of 5 × 6 m2 with 12 double layers of straw tubes and is shown in figure 1. Examples are shown of internal misalignments in individual detector modules, which can lead to improved single hit resolution of 180 μm when taken into account
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