Streamlined Calibrations of the ATLAS Precision Muon Chambers for   Initial LHC Running

N. Amram (1); R. Ball (2); Y. Benhammou (1); M. Ben Moshe (1); T. Dai; (2); E.B. Diehl (2); J. Dubbert (3); E. Etzion (1); C. Ferretti (2); J.; Gregory (2); S. Haider (4); J. Hindes (2); D.S. Levin (2); R. Thun (2); A.; Wilson (2); C. Weaverdyck (2); Y. Wu (2); H. Yang (2); B. Zhou (2); S.; Zimmermann (5) ((1) Raymond; Beverly Sackler School of Physics and; Astronomy; Tel-Aviv University; 69978 Tel Aviv; Israel; (2) Department of; Physics; The University of Michigan; Ann Arbor; MI 48109-1120; USA; (3); Max-Planck-Institut feur Physik; (Werner-Heisenberg-Institut); Muenchen,; Germany; (4) CERN; CH - 1211 Geneva 23; Switzerland; (5) Fakultat fuer; Mathematik und Physik; Albert-Ludwigs-Universitat; Freiburg; Germany)

arXiv:1103.0797·physics.ins-det·May 27, 2015

Streamlined Calibrations of the ATLAS Precision Muon Chambers for Initial LHC Running

N. Amram (1), R. Ball (2), Y. Benhammou (1), M. Ben Moshe (1), T. Dai, (2), E.B. Diehl (2), J. Dubbert (3), E. Etzion (1), C. Ferretti (2), J., Gregory (2), S. Haider (4), J. Hindes (2), D.S. Levin (2), R. Thun (2), A., Wilson (2), C. Weaverdyck (2), Y. Wu (2), H. Yang (2)

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TL;DR

This paper describes a calibration program for the ATLAS Muon Spectrometer's MDT chambers, improving muon momentum measurements during initial LHC operations by using a gas monitor system.

Contribution

It introduces a gas monitor system-based calibration method for the ATLAS Muon Spectrometer's MDT chambers during LHC startup.

Findings

01

Calibration improved muon track reconstruction accuracy.

02

Gas monitor system effectively accounted for environmental variations.

03

Enhanced detector performance during initial LHC running.

Abstract

The ATLAS Muon Spectrometer is designed to measure the momentum of muons with a resolution of dp/p = 3% and 10% at 100 GeV and 1 TeV momentum respectively. For this task, the spectrometer employs 355,000 Monitored Drift Tubes (MDTs) arrayed in 1200 Chambers. Calibration (RT) functions convert drift time measurements into tube-centered impact parameters for track segment reconstruction. RT functions depend on MDT environmental parameters and so must be appropriately calibrated for local chamber conditions. We report on the creation and application of a gas monitor system based calibration program for muon track reconstruction in the LHC startup phase.

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