CERN Accelerating science

Article
Report number	arXiv:1603.09516 ; MPP-2010-091
Title	Development of Fast High-Resolution Muon Drift-Tube Detectors for High Counting Rates
Author(s)	Bittner, B. (Munich, Max Planck Inst.) ; Dubbert, J. (Munich, Max Planck Inst.) ; Horvat, S. (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.) ; Adomeit, S. (Munich U.) ; Biebel, O. (Munich U.) ; Engl, A. (Munich U.) ; Hertenberger, R. (Munich U.) ; Rauscher, F. (Munich U.) ; Zibell, A. (Munich U.)
Publication	2011
Imprint	31 Mar 2016
Number of pages	4
In:	Nucl. Instrum. Methods Phys. Res., A 628 (2011) 154-157
In:	12th Vienna Conference on Instrumentation, Vienna, Austria, 15 - 20 Feb 2010, pp.154-157
DOI	10.1016/j.nima.2010.06.306
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	Pressurized drift-tube chambers are e?cient detectors for high-precision tracking over large areas. The Monitored Drift-Tube (MDT) chambers of the muon spectrometer of the ATLAS detector at the Large Hadron Collider (LHC) reach a spatial resolution of 35 micons and almost 100% tracking e?ciency with 6 layers of 30 mm diameter drift tubes operated with Ar:CO2 (93:7) gas mixture at 3 bar and a gas gain of 20000. The ATLAS MDT chambers are designed to cope with background counting rates due to neutrons and gamma-rays of up to about 300 kHz per tube which will be exceeded for LHC luminosities larger than the design value of 10-34 per square cm and second. Decreasing the drift-tube diameter to 15 mm while keeping the other parameters, including the gas gain, unchanged reduces the maximum drift time from about 700 ns to 200 ns and the drift-tube occupancy by a factor of 7. New drift-tube chambers for the endcap regions of the ATLAS muon spectrometer have been designed. A prototype chamber consisting of 12 times 8 layers of 15 mm diameter drift tubes of 1 m length has been constructed with a sense wire positioning accuracy of 20 microns. The 15 mm diameter drift-tubes have been tested with cosmic rays in the Gamma Irradiation Facility at CERN at counting rates of up to 1.85 MHz.
Copyright/License	arXiv nonexclusive-distrib. 1.0

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