The AMS Experiment: Cosmic Ray Measurements in Space<br> 
Markus Cristinziani<br> 
Universite' de Geneve<br><br> 
Abstract<br> 

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.