The LHCb Muon Detector Upgrades

After three years of shutdown (LS2), the LHC restarted in April 2022 and the plan is to run at an average instantaneous luminosity of $2.0 \times 10^{33}$cm$^{-2}$ s$^{-1}$ at the LHCb interaction point, a factor of five higher than the previous runs. In order to cope with the increased luminosity and to take data at the full bunch crossing frequency ($30$MHz visible interaction rate) in trigger-less mode, the LHCb Detector has just undergone a major upgrade, which will allow LHCb to collect approximately $50$ fb$^{-1}$ in the next 10 years. The LHCb Muon Detector has performed exceptionally well in the last ten years, providing Muon track detection efficiency of $99\%$ in Run 1 and $97.4\%$ in Run 2. Its main upgrade consists in the new off-detector and control electronics, able to cope with the full LHC bunch crossing frequency in trigger-less mode. A phase 2 upgrade of the LHCb Detector has also been proposed, for the further increase of the instantaneous luminosity foreseen by LHC (High Lumi LHC). The upgraded Muon Detector is presented, with particular focus on the installation and commissioning activities, the results of the functional tests performed during the LS2 and the very first and preliminary performance studies with new data. An overview of the proposed Upgrade 2 Muon detector is also given.