Abstract
The LHCb Outer Tracker is a gaseous detector covering an area of 5 × 6 m2 with 12 double layers of straw tubes. The detector with its services are described together with the commissioning and calibration procedures. Based on data of the first LHC running period from 2010 to 2012, the performance of the readout electronics and the single hit resolution and efficiency are presented.The efficiency to detect a hit in the central half of the straw is estimated to be 99.2%, and the position resolution is determined to be approximately 200 μm. The Outer Tracker received a dose in the hottest region corresponding to 0.12 C/cm, and no signs of gain deterioration or other ageing effects are observed.
Highlights
The LHCb detector [1] is a single-arm forward spectrometer covering the pseudo-rapidity range 2 < η < 5, designed for the study of particles containing b or c quarks
The area close to the beamline is covered by silicon-strip detectors, whereas the large area at more central rapidity is covered by the Outer Tracker (OT) straw-tube detector
This paper describes the detector performance in the first LHC running period from 2010 to 2012, when the LHCb experiment collected data at stable conditions, corresponding to a typical instantaneous luminosity of about 3.5 (4.0) × 1032 cm−2s−1 in 2011 (2012), with a 50 ns bunch crossing scheme and a proton beam energy of 3.5 (4) TeV
Summary
The LHCb detector [1] is a single-arm forward spectrometer covering the pseudo-rapidity range 2 < η < 5, designed for the study of particles containing b or c quarks. In the longest modules (type F ) the monolayers are split in the middle into two independent readout sections composed of individual straw tubes Both sections are read out from the outer ends. The complete OT detector consists of 168 long and 96 short modules and comprises 53,760 single straw-tube channels. The front-end (FE) electronics measures the drift-times of the ionization clusters produced by charged particles traversing the straw-tubes with respect to the beam crossing (BX) signal [4]. This board [9] provides the outside connections to the FE box: the power connection, the interface to the fastcontrol (beam crossing clock BX, triggers, resets) and the interface to the slow-control (I2C) These boxes are mounted at each end of the detector modules.
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