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T: Fachverband Teilchenphysik

T 96: DAQ, Trigger and Electronics IV

T 96.1: Vortrag

Donnerstag, 18. März 2021, 16:00–16:15, Tu

The phase-II upgrade of the first-level muon trigger for the ATLAS experiment at the HL-LHC — •Davide Cieri, Markus Fras, Oliver Kortner, Sandra Kortner, Hubert Kroha, and Robert Richter — Max-Planck-Institut für Physik, Munich, Germany

The first-level muon trigger of the ATLAS experiment will be upgraded to operate at the HL-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 trigger chambers. Matching MDT hits are then used to improve the momentum resolution, by forming track segments and combining them for the determination of the transverse momentum.

An ATCA–based hardware demonstrator of the MDT trigger processor has been produced, comprising two powerful FPGA devices and a large number of state-of-the-art optical links. A description of the algorithms for the MDT track reconstruction is presented together with the evaluation of the needed trigger processor resources. The achieved trigger performance allows for the reconstruction of muon tracks within the allocated 1µ s latency, with a momentum resolution of ∼6% and a trigger efficiency above 95% for 20 GeV muons, reducing the trigger rate of ∼70%.