Astrophysics with the AMS-02 experiment

Abstract

The Alpha Magnetic Spectrometer (AMS), whose final version AMS-02 is to be installed on the International Space Station (ISS) for at least 3 years, is a d etector designed to measure charged cosmic ray spectra with energies up to the TeV region and with high energy photon detection capability up to a few hundred GeV, using state-of-the-art particle identification techniques. Following the successful flight of the detector prototype (AMS- 01) aboard the space shuttle, AMS-02 is expected to provide a significant improvement on the curre nt knowledge of the elemental and isotopic composition of hadronic cosmic rays due to its long exposure time (minimum of 3 years) and large acceptance (0.5 m 2 sr) which will enable it to collect a total statistics of more than 10 10 nuclei. Detector capabilities for charge, velocity and mas s identification, estimated from ion beam tests and detailed Monte Carlo simulations, are presented. Relevant issues in cosmic ray astrophysics addressed by AMS-02, including the test of cosmic ray propagation models, galactic confinement times and the influence of solar cycles on the l ocal cosmic ray flux, are briefly discussed.