AugerPrime: Expectations and first results

With the knowledge and statistical power derived from two decades of measurements, the Pierre Auger Observatory has significantly advanced our understanding of ultra-high-energy cosmic rays whilst unearthing an increasingly complex astrophysical scenario and tensions with hadronic interaction models. The field now demands primary mass as an observable with an exposure that only the surface array of the Observatory can provide. Access to the primary mass hinges on the disentanglement of the electromagnetic and muonic components of extensive air showers. To this end, a scintillator and radio detector have been installed atop each existing water-herenkov detector of the surface array, whose dynamic range has also been enhanced through the installation of small area PMTs. The timing and signal resolution of all detector stations has additionally been improved with upgraded station electronics, and underground muon counters have been nstalled in a region of the array with denser spacing. As the commissioning of AugerPrime reaches its conclusion and the enhanced array comes fully online, we discuss expectations for its performance and the first physics results of this now multi-hybrid detector.