Upgrade of the ATLAS MDT Readout and Trigger for the HL-LHC

The luminosity increase of the LHC in Phase-II calls for an in-depth redesign of the entire MDT readout chain. While the high rate of primary detector signals requires increased bandwidth at each level of the data path, the MDT readout must, in addition, supply accurate coordinate information to the trigger system, leading to more reliable identification of high-pT tracks. The pre-selection of muon hits in the presence of large backgrounds from gamma and neutron conversions requires high-speed processing power as well as fast data links, capable to supply the relevant information to the MUCTPi inside the latency of 10 mys.