A toroidal trap for cold ${}^{87}Rb$ atoms using an rf-dressed quadrupole trap

Abstract

We demonstrate the trapping of cold ${}^{87}Rb$ atoms in a toroidal geometry using a radio frequency (rf) dressed quadrupole magnetic trap formed by superposing a strong rf-field on a quadrupole trap. This rf-dressed quadrupole trap has the minimum potential away from the quadrupole trap centre on a circular path which facilitates trapping in toroidal geometry. In these experiments, the laser cooled atoms were first trapped in a quadrupole trap, then cooled evaporatively using a weak rf-field, and finally trapped in an rf-dressed quadrupole trap. The radius of the toroid could be varied by varying the frequency of the dressing rf-field. It has also been demonstrated that a single rf source and an antenna can be used for the rf-evaporative cooling as well as for the rf-dressing of atoms. The atoms trapped in the toroidal trap may have applications in the realization of an atom gyroscope as well as in studying the quantum gases in low dimensions.

7 pages, 8 figures

References in corpus (11)

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• Anisotropic two-dimensional RF-dressed potentials for ultracold atoms
• Temperature and phase-space density of cold atom cloud in a quadrupole magnetic trap

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• Superfluid vortex dynamics on a torus and other toroidal surfaces of revolution
• Different atom trapping geometries with time averaged adiabatic potentials
• Dynamics of Vortex Clusters on a Torus
• Resonance enhancement of two photon absorption by magnetically trapped atoms in strong rf-fields