  The Large Area Telescope (LAT) on board the Gamma-ray Large-Area Space
Telescope (GLAST) is a pair-conversion gamma-ray detector designed to explore
the gamma-ray universe in the 20 MeV-300 GeV energy band. The Tracker subsystem
of the LAT will perform tracking of electron and positrons to determine the
origin of the gamma-ray. The design and performance of the GLAST LAT Tracker
are described in this paper.
