Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 27: Muon Detectors

T 27.2: Talk

Tuesday, March 17, 2026, 16:30–16:45, KH 00.023

Small-Diameter Muon Drift Tube Detector Chambers for the ATLAS Phase-II Upgrade: Performance and Certification with Final Readout Electronics — •Elena Voevodina, Oliver Kortner, Hubert Kroha, Nick Meier, and David Weber — Max Planck Institut für Physik - Werner Heisenberg Institute Boltzmannstr. 8 - 85748 Garching, Germany

To meet the High-Luminosity LHC (HL-LHC) requirements, the Muon Drift Tube (MDT) chambers in the ATLAS Muon Spectrometer's inner barrel layer (BIS) are being replaced by small-diameter MDT (sMDT) chambers. The new sMDT stations will be integrated with triplets of thin-gap Resistive Plate Chambers (RPCs) to increase geometric acceptance and strengthen the barrel muon trigger. Between January 2021 and September 2023, 102 sMDT chambers were produced at two sites; 50% with some spares were built at the Max Planck Institute for Physics (MPI), Munich. All detectors from both production sites have been shipped to CERN for final validation. Following the production of ~3,600 stacked readout mezzanine cards and their QC/QA testing at the University of Würzburg, the cards were installed on the BIS1-6 sMDT chambers at CERN in 2025. In this contribution, we present the certification methodology and performance results for detectors equipped with the final electronics at the CERN BB5 facility*covering gas tightness, electronic noise, muon detection efficiency, and spatial resolution*and compare them with the outcomes of the initial quality-assurance campaign conducted at MPI.

Keywords: ATLAS experiment; Muon Spectrometer; Muon Detector; Gaseous Detector; Small-Diameter Muon Drift Tube Detector Chamber