Efficient magnetic guiding and deflection of atomic beams with moderate velocities

We have studied guidance and deflection of a beam of cesium atoms by a stro ng toroidal magnetic quadrupole field. The beam guide is made from permanen t magnets sustaining a radial field gradient of 2.8 T/cm. Atoms with modera te longitudinal velocities ranging from 30 m/s to 70 m/s were inserted acro ss the 10-mm-diameter aperture of a 24.5 degrees are with radius 300 mm. We have measured transmission and beam divergence and find good agreement wit h ray-tracing calculations and analytical estimates. The magnetic beam guid e allows for 100% transmission of heavy atoms over large angles.