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ALICE is one of the four experiments at the CERN Large Hadron Collider (LHC)specifically designed to study nuclear matter at extreme conditions oftemperature and pressure. The LHC Run 3 started officially in July 2022 withproton-proton (pp) collisions at a centre-of-mass energy $\sqrt{s}$ = 13.6 TeVafter a shutdown of more than two years to allow for the upgrade of both theaccelerator and the experiments. To fulfill the requirements of the ALICEphysics program for Run 3, new timing, tracking and multiplicity detectors havebeen installed in the ALICE central barrel both at mid- and forward rapidities,the readout electronics of the majority of the detectors has been upgraded andthe ALICE Offline and Online computing farm has been completely renewed. A keydetector of the apparatus is the new, ultra-light, high-resolution InnerTracking System (ITS2) that significantly enhances the resolution on thedetermination of the distance of closest approach to the primary vertex, thetracking efficiency at low transverse momenta, and the read-out ratecapabilities with respect to what was achieved in the LHC Run 2 with the oldertracker. The new tracker consists of seven layers, azimuthally segmented intoStaves, equipped with silicon Monolithic Active Pixel Sensors with a pixel sizeof 27$\times$29 $\mu$m$^{2}$ covering a sensitive area of about 10 m$^2$. Along effort allowed the construction, characterization, installation andcommissioning of the ITS2 before starting Run 3. The in-pixel discriminatorthreshold calibration represents a challenging procedure due to the huge numberof channels and it is carried out by exploiting the power of the ALICE Offlineand Online farm. The detector took data for the full 2022 and its firstperformance results represent the second key part of this article.

Commissioning and Performance of the New ALICE Inner Tracking System in the First Phase of LHC Run 3