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Article
Report number	arXiv:1603.09504 ; MPP-2009-321 ; MPP-2009-321
Title	Development of Muon Drift-Tube Detectors for High-Luminosity Upgrades of the Large Hadron Collider
Author(s)	Bittner, B. (Munich, Max Planck Inst.) ; Dubbert, J. (Munich, Max Planck Inst.) ; Kortner, O. (Munich, Max Planck Inst.) ; Kroha, H. (Munich, Max Planck Inst.) ; Legger, F. (Munich, Max Planck Inst.) ; Richter, R. (Munich, Max Planck Inst.) ; Biebel, O. (Munich U.) ; Engl, A. (Munich U.) ; Hertenberger, R. (Munich U.) ; Rauscher, F. (Munich U.)
Publication	2016
Imprint	31 Mar 2016
Number of pages	4
In:	Nucl. Instrum. Methods Phys. Res., A 617 (2010) 169-172
In:	11th Pisa Meeting on Advanced Detectors on Frontier Detectors For Frontier Physics, La Biodola, Italy, 24 - 30 May 2009, pp.169-172
DOI	10.1016/j.nima.2009.06.086
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The muon detectors of the experiments at the Large Hadron Collider (LHC) have to cope with unprecedentedly high neutron and gamma ray background rates. In the forward regions of the muon spectrometer of the ATLAS detector, for instance, counting rates of 1.7 kHz/square cm are reached at the LHC design luminosity. For high-luminosity upgrades of the LHC, up to 10 times higher background rates are expected which require replacement of the muon chambers in the critical detector regions. Tests at the CERN Gamma Irradiation Facility showed that drift-tube detectors with 15 mm diameter aluminum tubes operated with Ar:CO2 (93:7) gas at 3 bar and a maximum drift time of about 200 ns provide e?cient and high-resolution muon tracking up to the highest expected rates. For 15 mm tube diameter, space charge e?ects deteriorating the spatial resolution at high rates are strongly suppressed. The sense wires have to be positioned in the chamber with an accuracy of better than 50 ?micons in order to achieve the desired spatial resolution of a chamber of 50 ?microns up to the highest rates. We report about the design, construction and test of prototype detectors which fulfill these requirements.
Copyright/License	arXiv nonexclusive-distrib. 1.0

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