P o S(VERTEX2015)022 AMS tracking in-orbit performance

AMS-02 is a high precision magnetic spectrometer for cosmic rays in the GeV to TeV energy range. Its tracker consists of nine layers of double-sided silicon microstrip sensors. They are used to locate the trajectories of cosmic rays in the 0.14 T field of a cylindrical magnet, thus measur-ing their rigidity p/Z and charge sign. In addition, they deliver a high resolution measurement of the absolute charge |Z|. The detector has been designed to operate in space with a position resolution of about 10 µm for each hit and charge identification capabilities up to Z = 26. In this talk I describe the performance in orbit of this detector component and its impact on the overall performance of the spectrometer. 24th International Workshop on Vertex Detector