The magnetic spectrometer of the PAMELA experiment: on-ground test of the flight model

The magnetic spectrometer of the PAMELA satellite experiment is composed of a microstrip silicon tracking system inserted inside the cavity of a permanent magnet. Providing that an accurate alignment of the tracking sensors is performed and adequate position-finding algorithms are applied, a spatial resolution of less than 3 mu m can be achieved. The tracking system performances combined with the magnetic field of the permanent magnet will allow the measurement of the high-energy cosmic-ray particle spectrum. The detector has been intensively tested during the long integration phase with both parti cle beams and ground muons. Results on the spectrometer performances in the flight configuration will be presented.