The AMS Experiment: Cosmic Ray Measurements in Space
Markus Cristinziani
Universite' de Geneve

Abstract
The Alpha Magnetic Spectrometer performed a successful test flight (AMS-01) in June 1998 onboard Space Shuttle Discovery. Data recorded during the 10 days of operation enabled an accurate measurement of primary and second cosmic ray spectra and a search for antimatter. The improved AMS-02 version of the detector is now being constructed and will be installed on the International Space Station for a three years operation. The extended physics program will also include high energy photon measurements. Results and status of AMS will be presented.