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T: Fachverband Teilchenphysik

T 14: Detectors 3 (muon detectors)

T 14.4: Talk

Monday, March 4, 2024, 16:45–17:00, Geb. 30.23: 3/1

Certification of sMDT chambers for the phase II upgrade of the ATLAS muon spectrometer — •Nick Meier, Oliver Kortner, Hubert Kroha, Elena Voevodina, Francesco Fallavollita, and Giorgia Proto — MPI für Physik, München, Deutschland

For operation at the HL-LHC, the ATLAS experiments will upgrade the inner muon spectrometer barrel layer with stations of thin-gap resistive plate chambers (RPCs) and small diameter muon drift-tube (sMDT) chambers in order to increase the acceptance of the first level muon trigger from current 80% to 95% and prevent deterioration of the spatial resolution and tracking efficiency due to high background irradiation. The MPI for Physics in Munich produced 48 sMDT chambers for this upgrade. The performance of 39 chambers after transportation to CERN was measured with cosmic-ray muons: electronics noise, muon detection efficiency, and the spatial resolution of all chambers were determined. The methods used for the certification and the results of the tests will be explained in this presentation and will be compared to the initial test campaign at MPI for Physics.

Keywords: Muon Detector; ATLAS; HL-LHC; Certification; sMDT