CERN Accelerating science

ATLAS Note
Report number	ATL-MUON-PROC-2011-005
Title	Calibration and Performance of the precision chambers of the ATLAS muon spectrometer
Author(s)	Diehl, E (Michigan U.)
Collaboration	for the ATLAS collaboration
Publication	2012
Imprint	10 Oct 2011
Number of pages	6
In:	Phys. Procedia 37 (2012) 543-548
In:	2nd International Conference on Technology and Instrumentation in Particle Physics, Chicago, IL, USA, 9 - 14 Jun 2011, pp.543-548
DOI	10.1016/j.phpro.2012.02.404
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	LHC ; ATLAS ; muon ; spectrometer ; drift tube
Abstract	The ATLAS muon spectrometer consists of a system of precision tracking and trigger chambers embedded in a 2T magnetic field generated by three large air‐core superconducting toroids. The precision Monitored Drift Tube (MDT) chambers measure the track sagitta up to a pseudo‐rapidity of 2.7 with a 50 micron uncertainty yielding a design muon transverse momentum resolution of 10% at 1 TeV. Muon tracking is augmented in the very forward region by Cathode trip Chambers (CSC). The calibration program, essential to achieve the spectrometer design performance and physics reach, is conducted at three worldwide computing centers. These centers each receive a dedicated High Level Trigger data stream that enables high statistics based determination of timing offsets and drift‐time to drift‐space relations. During the first year of data taking a system of periodic calibration updates has been established. The calibration algorithms, methods and tools and performance results for this first year of LHC collision data collected by the muon spectrometer are discussed.
Copyright/License	publication: © 2012-2025 Elsevier (License: CC-BY-NC-ND-3.0)

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