The Anti Matter Spectrometer (AMS-02): a Particle Physics Detector In Space

AMS-02 is a space borne magnetic spectrometer designed to measure with accuracies up to one part in 10 9 the composition of Cosmic Rays near Earth. With a large acceptance (5000 cm 2 sr), an intense magnetic field from a superconducting magnet (0.7 T) and an accurate particle identifications AMS-02 will provide the highest accuracy in Cosmic Rays measurements up to the TeV region. During a three years long mission on the ISS AMS-02 will achieve a sensitivity of one part in a billion to the existence of anti-He in the Cosmic Ray as well as important informations on the origin of Dark Matter. We review the status of the construction of the AMS-02 experiment in preparation for the three years mission on the ISS