Resolution of the ATLAS muon spectrometer monitored drift tubes in LHC Run 2

ATLAS Collaboration, G Aad, Torsten Åkesson, Simona Bocchetta, Lene Bryngemark, Eric Edward Corrigan, Caterina Doglioni, Kristian Gregersen, Eva Brottmann Hansen, Vincent Hedberg, Göran Jarlskog, Charles Kalderon, Edgar Kellermann, Balazs Konya, Else Lytken, Katja Mankinen, Caterina Marcon, Ulf Mjörnmark, Geoffrey André Adrien Mullier, Ruth PöttgenTrine Poulsen, Eleni Skorda, Oxana Smirnova, L Zwalinski

Research output: Contribution to journalArticlepeer-review


The momentum measurement capability of the ATLAS muon spectrometer relies fundamentally on the intrinsic single-hit spatial resolution of the monitored drift tube precision tracking chambers. Optimal resolution is achieved with a dedicated calibration program that addresses the specific operating conditions of the 354 000 high-pressure drift tubes in the spectrometer. The calibrations consist of a set of timing offsets and drift time to drift distance transfer relations, and result in chamber resolution functions. This paper describes novel algorithms to obtain precision calibrations from data collected by ATLAS in LHC Run 2 and from a gas monitoring chamber, deployed in a dedicated gas facility. The algorithm output consists of a pair of correction constants per chamber which are applied to baseline calibrations, and determined to be valid for the entire ATLAS Run 2. The final single-hit spatial resolution, averaged over 1172 monitored drift tube chambers, is 81.7 ± 2.2 μm. © 2019 CERN for the benefit of the ATLAS collaboration. Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Original languageEnglish
Article numberP09011
JournalJournal of Instrumentation
Issue number9
Publication statusPublished - 2019

Subject classification (UKÄ)

  • Accelerator Physics and Instrumentation
  • Subatomic Physics

Free keywords

  • Gaseous detectors
  • Muon spectrometers
  • Particle tracking detectors (gaseous detectors)
  • Wire chambers (MWPC, thin-gap chambers, drift chambers, drift tubes, proportional chambers etc)
  • Charged particles
  • Gas detectors
  • Image resolution
  • Ionization chambers
  • Particle spectrometers
  • Tubes (components)
  • ATLAS Muon spectrometer
  • Baseline calibration
  • High pressure drift tubes
  • Momentum measurement
  • Monitored drift tubes
  • Muon spectrometer
  • Thin Gap Chamber
  • Drift chambers


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