Volume 61, Number 2, January 2003
|Page(s)||187 - 193|
|Section||Atomic and molecular physics|
|Published online||01 January 2003|
Continuous loading of a non-dissipative atom trap
Laboratoire Kastler Brossel - 24 rue Lhomond, F-75231 Paris Cedex 05, France
Accepted: 4 November 2002
We study theoretically a scheme in which particles from an incident beam are trapped in a potential well when colliding with particles already present in the well. The balance between the arrival of new particles and the evaporation of particles from the trapped cloud leads to a steady state that we characterize in terms of particle number and temperature. This scheme is particularly interesting for a cigar-shaped potential where different longitudinal and transverse evaporation thresholds can be chosen. We show that a resonance occurs when the transverse evaporation threshold coincides with the energy of the incident particles. It leads to a dramatic increase in phase space density with respect to the incident beam.
PACS: 32.80.Pj – Optical cooling of atoms; trapping / 05.20.Dd – Kinetic theory / 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena
© EDP Sciences, 2003
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