Abstract
In preparation for the coming years of LHC running at higher luminosity, two upgrade projects of the ATLAS Muon Spectrometer have been developed: the New Small Wheel project, improving the trigger in the end-cap regions, and the BIS78 project, dedicated to the transition region between the barrel and the endcaps (1< |η| <1.3). The BIS78 project will add 32 RPC triplets on the edges of the inner barrel sectors where the ATLAS toroid is present. These new generation of RPCs are characterized by thinner gas gaps (1 mm vs 2 mm of the legacy RPCs) as well as thinner resistive electrodes, together with a new high gain front-end electronics operating at lower voltage. Sixteen BIS78 stations have been already installed in the ATLAS Muon spectrometer between 2020 and 2021 and are being commissioned during this year. The status of the project, the status of the commissioning as well as the overall performances of the installed RPCs will be presented.
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