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Mousa, Jehad/0000-0002-2978-2718; Cavallari, Francesca/0000-0002-1061-3877; Tapper, Alexander/0000-0003-4543-864X; Garcia, Francisco/0000-0002-4023-7964; Della Ricca, Giuseppe/0000-0003-2831-6982; Ciocci, Maria Agnese/0000-0003-0002-5462; Vilela Pereira, Antonio/0000-0003-3177-4626; Polikarpov, Sergey/0000-0001-6839-928X; Evdokimov, Anatoly/0000-0002-1296-5825; Vazquez-Escobar, Julia/0000-0002-7533-2283; Gerosa, Raffaele/0000-0001-8359-3734; Belyaev, Alexander/0000-0002-1733-4408; Acosta, Darin/0000-0001-5367-1738Since the initial data taking of the CERN LHC, the CMS experiment has undergone substantial upgrades and improvements. This paper discusses the CMS detector as it is configured for the third data-taking period of the CERN LHC, Run 3, which started in 2022. The entire silicon pixel tracking detector was replaced. A new powering system for the superconducting solenoid was installed. The electronics of the hadron calorimeter was upgraded. All the muon electronic systems were upgraded, and new muon detector stations were added, including a gas electron multiplier detector. The precision proton spectrometer was upgraded. The dedicated luminosity detectors and the beam loss monitor were refurbished. Substantial improvements to the trigger, data acquisition, software, and computing systems were also implemented, including a new hybrid CPU/GPU farm for the high-level trigger.eninfo:eu-repo/semantics/openAccessCalorimetersLarge Detector Systems For Particle And Astroparticle PhysicsParticle Tracking DetectorsArticle10.1088/1748-0221/19/05/P050642-s2.0-85195241083