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Conference Paper

Upgrades of the ATLAS Muon Spectrometer with New Small-Diameter Drift Tube Chambers

MPS-Authors

Kroha,  Hubert
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kortner,  Oliver
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nowak,  Sebastian
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Podkladkin,  Sergey
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rieck,  Patrick
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmidt-Sommerfeld,  Korbinian
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Takasugi,  Erik
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Walbrecht,  Verena
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Fakhrutdinov,  Rinat
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kozhin,  Anatoly
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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https://publications.mppmu.mpg.de/2018/MPP-2018-153/FullText.pdf
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Citation

Kroha, H., Kortner, O., Nowak, S., Podkladkin, S., Rieck, P., Schmidt-Sommerfeld, K., et al. (2019). Upgrades of the ATLAS Muon Spectrometer with New Small-Diameter Drift Tube Chambers. Nuclear Instruments and Methods in Physics Research Section A, 936, 509.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D78B-C
Abstract
Small diameter muon drift-tube (sMDT) chambers with 15 mm tube diameter provide excellent spatial resolution like the MDT chambers with 30 mm tube diameter used in the ATLAS muon spectrometer so far, but can be operated at ten times higher background rates and allow for the instrumentation of regions where MDT chambers do not fit in. In April 2014 two BME and in January 2016 another 12 BMG sMDT chambers have been installed in the middle layer of the barrel muon detector and are operational since then in order to increase the acceptance for precision muon momentum measurement using three chamber layers. An unprecedently high sense wire positioning accuracy of 5 micron (rms) has been achieved. In the next long LHC shutdown 2019-2020, 16 BIS78 sMDT chambers will be installed in the barrel inner layer in the transition region to inner endcap layer to make room for the installation of new RPC muon trigger chambers in order to reduce the accidential trigger rate in this region as required for operation at HL-LHC. This is a pilot project for the complete replacement of the MDT chambers in the small sectors of the barrel inner layer by integrated sMDT-RPC detectors (BIS1-6) in the ATLAS upgrade for HL-LHC.