  We demonstrate the bi-directional propagation of more than 10 7 atoms (87 Rb)
around a "stadium" shaped magnetic ring that encloses an area of 10.9 cm 2,
with a flux density exceeding 10 11 atoms sec -1 cm -2 . Atoms are loaded into
the guide from a 2D + MOT at one side of the "stadium". An optical standing
wave pulse is applied to increase the propagation velocity of atoms along the
waveguide. The atom sample fills the entire ring in 200 ms when
counterpropagating atom sections of the original atom cloud recombine at their
initial positions after a full revolution. We discuss a possible extension of
this result to a guided atom ring interferometer.
