Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 90: Muon detectors

T 90.3: Talk

Thursday, March 18, 2021, 16:35–16:50, To

Performance of Muon Drift Tube Detectors and Fast Readout Electronics at Very High Counting Rates — Hubert Kroha, Oliver Kortner, Elena Voevodina, and •Gregor Eberwein — Max-Planck-Institute for Physics, Munich, Germany

Small-diameter Drift Tube (sMDT) detectors with 15 mm tube diameter have proven to be excellent candidates for precision muon tracking detectors in experiments at future hadron colliders like HL-LHC and FCC-hh where unprecedented high background rate capabilities are required. sMDT chambers are currently being installed in the inner barrel layer of the ATLAS muon spectrometer. The rate capability of the sMDT drift tubes in terms of muon detection efficiency and spatial resolution is limited by the performance of the readout electronics. Simulations show, that the addition of active baseline restoration circuits in the front-end electronics chips in order to suppress signal-pile-up effects at high counting rates leads to significant improvement of both efficiency and resolution. To confirm these expectations, extensive tests using sMDT prototype chambers have been conducted at the CERN Gamma Irradiation Facility. Chambers equipped with readout chips with improved pulse shaping and discrete readout circuits with baseline restoring functionality have been tested. Results of both simulation and test will be presented. They provide guidelines for the design of a new sMDT readout chip for operation at very high counting rates.