Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field

Details Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field

2007-09-18

arxiv.org/abs/0709.2841v1

Journal of Physics B: Atomic and Molecular Physics 40 (2007) 4013

Physics

Atomic Physics

6 pages, 6 figures; to appear in J. Phys. B

Scientific paper

10.1088/0953-4075/40/20/004

We observe the spontaneous evaporation of atoms confined in a bubble-like rf-dressed trap (Zobay and Garraway, 2001). The atoms are confined in a quadrupole magnetic trap and are dressed by a linearly polarized rf field. The evaporation is related to the presence of holes in the trap, at the positions where the rf coupling vanishes, due to its vectorial character. The final temperature results from a competition between residual heating and evaporation efficiency, which is controlled via the height of the holes with respect to the bottom of the trap. The experimental data are modeled by a Monte-Carlo simulation predicting a small increase in phase space density limited by the heating rate. This increase was within the phase space density determination uncertainty of the experiment.

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