The microstrip silicon tracker of the PAMELA experiment

The trackingsystem for the PAMELA spectrometer is actually under construction usingdouble-sided double metal AC coupled microstrip silicon sensors. To study the performances of the silicon detectors and of the readout electronics several tests have been performed, usingminimum ionizingparticles. The characteristics of the detectors are described and the main results obtained from the July ’97 test-beam are presented, with particular reference to the spatial resolution.