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Gravitational Sisyphus Cooling of ⁸⁷Rb in a Magnetic Trap

N. R. Newbury

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Physics Department, University of Colorado, Boulder, Colorado 80309-0440, USA

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C. J. Myatt

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Physics Department, University of Colorado, Boulder, Colorado 80309-0440, USA

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E. A. Cornell

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Physics Department, University of Colorado, Boulder, Colorado 80309-0440, USA

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C. E. Wieman

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

National Institute of Standards and Technology, 100 Bureau Drive, Stop 1070, Gaithersburg, MD 20899-1070, USA

Physics Department, University of Colorado, Boulder, Colorado 80309-0440, USA

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https://doi.org/10.1142/9789812813787_0051Cited by:0 (Source: Crossref)

Abstract:

We describe a method for cooling magnetically trapped ⁸⁷Rb atoms by irreversibly cycling the atoms between two trapped states. The cooling force is proportional to gravity. The atoms are cooled to 1.5 μK in the vertical dimension. We have extended this cooling method to two dimensions through anharmonic mixing, achieving a factor of 25 increase in the phase space density over an uncooled sample. This cooling method should be an important intermediate step toward achieving a Bose-Einstein condensate of Rb atoms.

PACS: 32.80.Pj

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Gravitational Sisyphus Cooling of ⁸⁷Rb in a Magnetic Trap