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Refroidissement par évaporation d'un jet atomique guidé magnétiquement

Abstract : This manuscript deals with the experimental realization of an ultracold, magnetically guided atomic beam in the collisional regime. After a detailed description of the experimental setup developed for this purpose, a method to measure the beam temperature with radio-frequency spectroscopy is proposed theoretically and demonstrated experimentally. The variations in temperature, phase-space density and elastic collision rate of the beam during a cycle evaporation-rethermalization are calculated. Two-antenna radio-frequency evaporation experiments are then described. They allow one to demonstrate the occurrence of elastic collisions within the atomic beam. Two hamiltonian methods allowing one to increase the elastic collision rate are then studied theoretically and investigated experimentally. The elastic collision rate obtained this way is then used in order to cool the beam by means of ten evaporation zones, thus increasing the beam's phase-space density by one order of magnitude.
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https://tel.archives-ouvertes.fr/tel-00011260
Contributor : Thierry Lahaye <>
Submitted on : Thursday, December 22, 2005 - 7:03:01 PM
Last modification on : Thursday, October 29, 2020 - 3:01:15 PM
Long-term archiving on: : Friday, September 14, 2012 - 4:40:54 PM

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  • HAL Id : tel-00011260, version 1

Citation

Thierry Lahaye. Refroidissement par évaporation d'un jet atomique guidé magnétiquement. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011260⟩

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