  The future Electron-Ion Collider (EIC) will explore several fundamental
questions in a broad Bjorken-x ($x_{BJ}$) and $Q^{2}$ phase space. Heavy flavor
and jet products are ideal probes to precisely study the tomography of
nucleon/nuclei structure, help solve the proton spin puzzle and understand the
hadronizaton processes in vacuum or in the QCD medium. Due to the asymmetric
collisions at the EIC, most of the final state hadrons are produced in the
nucleon/nuclei beam going (forward) direction. A silicon vertex/tracking is
critical to precisely measure these forward hadrons at the EIC. Details of
different conceptual designs of the proposed Forward Silicon Tracker (FST) and
the relevant detector performance are presented in this technical note. The
associated heavy flavor and jet studies with the evaluated FST performance are
discussed as well.
