Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Elektronik

T 35.5: Talk

Tuesday, March 20, 2018, 17:30–17:45, Z6 - SR 1.005

Optimization of the ATLAS (s)MDT readout electronics for high counting rates — Pedro Guerzoni de Figueiredo, Oliver Kortner, Hubert Kroha, Sebastian Nowak, and •Korbinian Schmidt-Sommerfeld — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München

In the ATLAS muon spectrometer, Monitored Drift Tube (MDT) chambers are used for precise muon track measurement. For the high background rates expected at HL-LHC, which are mainly due to neutrons and photons produced by interactions of the proton collision products in the detector and shielding, new small-diameter Muon Drift Tube (sMDT)-chambers with half the drift tube diameter of the MDT-chambers and ten times higher rate capability have been developed. In order to avoid baseline shifts of the shaped signal the standard MDT readout electronics uses bipolar shaping which however, leads to a deterioration of signal pulses due to preceding background hits at high counting rates, leading to losses in muon efficiency and drift tube spatial resolution. These so-called signal pile-up effects can be mitigated by active baseline restoration (BLR), which can also eliminate the baseline shift in the case of unipolar shaping. Discrete multi-channel prototype electronics of both types have been tested with generated input pulses and in the Gamma Irradiation Facility at CERN under high γ-irradiation rates.