  High energy particles' behavior including fusion born alpha particles in an
ITER like tokamak in the presence of background driftwave turbulence is
investigated by an orbit following calculation. The background turbulence is
given by the toroidal driftwave eigenmode combined with a random number
generator. The transport level is reduced as the particle energy increase; the
widths of the guiding center islands produced by the passing particles are
inverse proportional to the square root of parallel velocities. On the other
hand, the trapped particles are sensitive to $E \times B$ drift at the banana
tips whose radial displacement is larger for lower energy particles. Coulomb
collisional effects are incorporated which modifies the transport process of
the trapped high energy particles whose radial excursion resides in limited
radial domains without collisions.
