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Evaporative cooling of an atomic beam

  • E. Mandonnet
  • A. Minguzzi
  • R. Dum
  • I. Carusotto
  • Y. Castin
  • J. Dalibard

Abstract:

We present a theoretical analysis of the evaporative cooling of an atomic beam propagating in a magnetic guide. Cooling is provided by transverse evaporation. The atomic dynamics inside the guide is analyzed by solving the Boltzmann equation with two different approaches: an approximate analytical ansatz and a Monte-Carlo simulation. Within their domain of validity, these two methods are found to be in very good agreement with each other. They allow us to determine how the phase-space density and the flux of the beam vary along its direction of propagation. We find a significant increase for the phase-space density along the guide for realistic experimental parameters. By extrapolation, we estimate the length of the beam needed to reach quantum degeneracy.

PACS. 05.30.Jp Boson systems - 03.75.Fi Phase coherent atomic ensembles; quantum condensation phenomena - 32.80.Pj Optical cooling of atoms; trapping 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • E. Mandonnet
    • 1
  • A. Minguzzi
    • 2
  • R. Dum
    • 1
  • I. Carusotto
    • 2
  • Y. Castin
    • 1
  • J. Dalibard
    • 1
  1. 1.Laboratoire Kastler Brossel, 24 rue Lhomond, 75005 Paris, FranceFR
  2. 2.INFM, Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, ItalyIT

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