CERN Accelerating science

Article
Report number	arXiv:1603.09544
Title	Upgrades of the ATLAS Muon Spectrometer with sMDT Chambers
Author(s)	Ferretti, C. (Michigan U.) ; Kroha, H. (Munich, Max Planck Inst.)
Collaboration	for the ATLAS Muon Collaboration
Publication	2016-07-11
Imprint	31 Mar 2016
Number of pages	3
In:	Nucl. Instrum. Methods Phys. Res., A 824 (2016) 538-540
In:	Frontier Detectors for Frontier Physics: 13th Pisa Meeting on Advanced Detectors, La Biodola, Isola D'elba, Italy, 24 - 30 May 2015, pp.538-540
DOI	10.1016/j.nima.2015.11.043
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	With half the drift-tube diameter of the Monitored Drift Tube (MDT) chambers of the ATLAS muon spectrometer and otherwise unchanged operating parameters, small-diameter Muon Drift Tube (sMDT) chambers provide an order of magnitude higher rate capability and can be installed in detector regions where MDT chambers do not fit. The chamber assembly time has been reduced by a factor of seven to one working day and the sense wire positioning accuracy improved by a factor of two to better than ten microns. Two sMDT chambers have been installed in ATLAS in 2014 to improve the momentum resolution in the barrel part of the spectrometer. The construction of an additional twelve chambers covering the feet regions of the ATLAS detector has started. It will be followed by the replacement of the MDT chambers at the ends of the barrel inner layer by sMDTs improving the Performance at the high expected background rates and providing space for additional RPC trigger chambers.
Copyright/License	Elsevier B.V. (License: arXiv nonexclusive-distrib. 1.0)

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