Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 7: Detectors II (Gaseous Detectors)

T 7.2: Talk

Monday, March 31, 2025, 17:00–17:15, VG 1.102

Small-Diameter Muon Drift Tube Detector Chambers for the ATLAS Phase-II Upgrade: Performance Testing and Certification with New Readout — •Bastian Wesely, Fan Zhou, Oliver Kortner, Hubert Kroha, Nick Kube, Nick Meier, and Elena Voevodina — Max-Planck-Institute for Physics, Munich, Germany

To meet the requirements of the High-Luminosity LHC (HL-LHC), the Muon Drift Tube (MDT) chambers in the inner barrel layer (BIS) of the ATLAS muon spectrometer are being replaced with small-diameter Muon Drift Tube (sMDT) chambers. These advanced chambers will be integrated with triplets of thin-gap Resistive Plate Chambers (RPCs) to enhance the acceptance and robustness of the barrel muon trigger system. The sMDT chambers, designed with drift tubes that are half the diameter of the original MDT chambers, deliver an order-of-magnitude improvement in background rate capability. A total of 96 new sMDT chambers were constructed between January 2021 and September 2023 at two production sites. 50% of these chambers were produced at the Max Planck Institute for Physics (MPP) in Munich, and they are now being equipped with final readout electronics at BB5, CERN. In this contribution, we will present the certification methods and performance test results from the CERN BB5 facility, comparing them with the initial testing campaign conducted at the Max Planck Institute for Physics.

Keywords: HL-LHC; ATLAS; Muon; sMDT; RPC