Performance of the ATLAS Precision Muon Chambers under LHC Operating Conditions

Deile, M.; Horvat, S; Dietl, H; Rauscher, F; Mohrdieck, S; Manz, A; Kortner, O; Staude, A; Dubbert, J; Kroha, H; Richter, Robert

doi:10.1016/j.nima.2003.10.025

Article
Report number	MPI-PHE-2003-03 ; arXiv:1604.00236 ; MPI-PHE-2003-03
Title	Performance of the ATLAS Precision Muon Chambers under LHC Operating Conditions
Author(s)	Deile, M. (Munich, Max Planck Inst.) ; Dietl, H (Munich, Max Planck Inst.) ; Dubbert, J (Munich U.) ; Horvat, S (Munich, Max Planck Inst.) ; Kortner, O (Munich, Max Planck Inst.) ; Kroha, H (Munich, Max Planck Inst.) ; Manz, A (Munich, Max Planck Inst.) ; Mohrdieck, S (Munich, Max Planck Inst.) ; Rauscher, F (Munich U.) ; Richter, Robert (Munich, Max Planck Inst.) ; Staude, A (Munich U.)
Publication	2004
Imprint	01 Apr 2016
Number of pages	4
In:	Nucl. Instrum. Methods Phys. Res., A 518 (2004) 65-68
In:	9th Pisa Meeting on Advanced Detectors, La Biodola, Italy, 25 - 31 May 2003, pp.65
DOI	10.1016/j.nima.2003.10.025
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	For the muon spectrometer of the ATLAS detector at the large hadron collider (LHC), large drift chambers consisting of 6 to 8 layers of pressurized drift tubes are used for precision tracking covering an active area of 5000 m2 in the toroidal ?eld of superconducting air core magnets. The chambers have to provide a spatial resolution of 41 microns with Ar:CO2 (93:7) gas mixture at an absolute pressure of 3 bar and gas gain of 2?104. The environment in which the chambers will be operated is characterized by high neutron and background with counting rates of up to 100 per square cm and second. The resolution and efficiency of a chamber from the serial production for ATLAS has been investigated in a 100 GeV muon beam at photon irradiation rates as expected during LHC operation. A silicon strip detector telescope was used as external reference in the beam. The spatial resolution of a chamber is degraded by 4 ?m at the highest background rate. The detection e?ciency of the drift tubes is unchanged under irradiation. A tracking e?ciency of 98% at the highest rates has been demonstrated.
Copyright/License	arXiv nonexclusive-distrib. 1.0