Hannover 2003 – wissenschaftliches Programm

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Q: Quantenoptik

Q 14: Quantengase 2

Q 14.7: Vortrag

Montag, 24. März 2003, 18:00–18:15, F303

Loading of a cold atomic beam into a magnetic guide — •Christian Roos, Philippe Cren, Thierry Lahaye, Jean Dalibard, and David Guéry-Odelin — Laboratoire Kastler Brossel, Ecole normale supérieure, Paris

A spectacular challenge in the field of Bose-Einstein condensation consists in the achievement of a continuous beam operating in the quantum degenerate regime. For this purpose, a non-degenerate, but already slow and cold beam of particles, is injected into a magnetic guide where transverse evaporation is going to take place. If the elastic collision rate is large enough, efficient evaporative cooling can lead to quantum degeneracy at the exit of the guide.
In this talk, we present the loading of a slow and cold beam of ⁸⁷Rb atoms into a magnetic guide. A two-dimensional magneto-optical trap is used to produce an intense beam of slow atoms that are recaptured in a second trap which combines a moving molasses with transverse confinement. Its purpose consists in further reducing the beam’s velocity, in cooling the atoms and in injecting them into a magnetic guide. This trap provides a continuous flux larger than 10⁹ atoms/s with an adjustable mean velocity ranging from 0.3 to 3 m/s, and with longitudinal and transverse temperatures smaller than 100 µK. Up to 3× 10⁸ atoms/s are injected into the guide and subsequently guided over a distance of up to 2.2 m.