Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 20: DAQ, trigger and electronics I

T 20.1: Group Report

Monday, March 30, 2020, 16:30–16:50, L-3.015

The Phase-II upgrade of the first-level muon trigger for the ATLAS experiment at the HL-LHC — •Davide Cieri, Sergey Abovyan, Varuzhan Danielyan, Markus Fras, Oliver Kortner, Sandra Kortner, Hubert Kroha, Sebastian Nowak, and Robert Richter for the ATLAS collaboration — Max-Planck-Institut fuer Physik, Munich, Germany

The first-level muon trigger of the ATLAS experiment will be upgraded to operate at the High-Luminosity LHC. The selectivity of the current system is limited by the moderate spatial resolution of RPC and TGC trigger chambers. The Monitored Drift Tube (MDT) chambers currently used for the precision tracking will be therefore included to improve the transverse momentum resolution and the redundancy.

In the upgraded muon trigger system, the MDT trigger processors will receive MDT hits from the detectors and match them to the trigger candidates from the RPC and TGC trigger systems. These seeds provide a Region-of-Interest and the bunch-crossing timing which is used for calculating the MDT drift time. Matching MDT hits are used by the MDT trigger algorithm to improve the momentum resolution, by forming track segments and combining them for the determination of the transverse momentum.

An FPGA-based hardware demonstrator of the MDT trigger processor is currently under production. A description of the proposed track finding algorithm is presented, together with the obtained performance and its FPGA implementation.