  This thesis reports the various phases of the life cycle of a cylindrical GEM
detector, developed within the context of the CGEM-IT project. This represents
the Italian proposal for the upgrade of the BESIII inner tracker, which has
been suffering from aging phenomena due to the high luminosity. The
construction of the detector at Frascati National Laboratories and the early
phases of its commissioning at IHEP are described in detail. In the last two
chapters, noise studies on data collected using a CGEM detector with a full
readout chain near the BEPC-II interaction point will be presented, starting
from the quality assurance tests of the on-detector electronics. The
measurements are realized exploiting the different operative phases of the
BEPC-II storage ring and aim to provide an estimate of the noise level
variation due to the surrounding environment.
