The ALICE Transition Radiation Detector: Construction, operation, and performance

ALICE Collaboration

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The Transition Radiation Detector (TRD) was designed and built to enhance the capabilities of the ALICE detector at the Large Hadron Collider (LHC). While aimed at providing electron identification and triggering, the TRD also contributes significantly to the track reconstruction and calibration in the central barrel of ALICE. In this paper the design, construction, operation, and performance of this detector are discussed. A pion rejection factor of up to 410 is achieved at a momentum of 1 GeV/c in p–Pb collisions and the resolution at high transverse momentum improves by about 40% when including the TRD information in track reconstruction. The triggering capability is demonstrated both for jet, light nuclei, and electron selection.
Original languageEnglish
Pages (from-to)88-127
Number of pages40
JournalNuclear Instruments & Methods in Physics Research. Section A. Accelerators, Spectrometers, Detectors
Early online date21 Sept 2017
Publication statusPublished - 11 Feb 2018


  • Transition radiation detector
  • Multi-wire proportional drift chamber
  • Fibre/foam sandwich radiator
  • Xenon-based gas mixture
  • Tracking
  • Ionisation energy loss
  • dE/dx
  • TR
  • Electron-pion identification
  • Neural network
  • Trigger


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