Hannover 2003 – scientific programme
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Q: Quantenoptik
Q 14: Quantengase 2
Q 14.7: Talk
Monday, March 24, 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.