  The Alpha Magnetic Spectrometer (AMS) is a particle detector, designed to
search for cosmic antimatter and dark matter and to study the elemental and
isotopic composition of primary cosmic rays, that will be installed on the
International Space Station (ISS) in 2008 to operate for at least three years.
The detector will be equipped with a ring imaging Cherenkov detector (RICH)
enabling measurements of particle electric charge and velocity with
unprecedented accuracy. Physics prospects and test beam results are shortly
presented.
