Dispersion management using betatron resonances in an ultracold-atom storage ring

Abstract

Specific velocities of particles circulating in a storage ring can lead to betatron resonances at which static perturbations of the particles' orbit yield large transverse (betatron) oscillations. We have observed betatron resonances in an ultracold-atom storage ring by direct observation of betatron motion. These resonances caused a near-elimination of the longitudinal dispersion of atomic beams propagating at resonant velocities, an effect which can improve the performance of atom interferometric devices. Both the resonant velocities and the strength of the resonances were varied by deliberate modifications to the storage ring.

4 pages, 5 figures. Also available at http://physics.berkeley.edu/research/ultracold

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• Adjustable microchip ring trap for cold atoms and molecules
• Acceleration and localization of matter in a ring trap
• A ring accelerator for matter-wave solitons
• Probing the quantum state of a guided atom laser pulse
• Geometric phase of an atom inside an adiabatic radio frequency potential