ABSTRACT: 75 years after the cyclotron was invented at Berkeley, we have developed a storage ring of a much different character for ultracold atoms. Bose-Einstein condensates of rubidium produced in a magnetic ring waveguide of radius of ~1mm are accelerated into single-transverse-mode propagation for many revolutions and exhibit long-range coherence. The ring shape is ideally suited for studies of vorticity in a multiply-connected geometry, and holds promise as a rotation sensor. We have exploited transverse motional (betatron) resonances to manage velocity dispersion yielding atom pulses with a longitudinal kinetic temperature of <100 pK, the lowest measured to date.

Contact: Luis Orozco