J. Phys. IV France 116 (2004) 259-264
How to reach the collisional regime on a magnetically guided atomic beamJ.M. Vogels1, T. Lahaye1, C.F. Roos2, J. Dalibard1 and D. Guéry-Odelin1
1 Laboratoire Kastler Brossel, École normale supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
2 Institut für Experimentalphysik, Innsbruck University, 6020 Innsbruck, Austria
In this paper, we report our progress towards the realization of a continuous guided atomic beam in the degenerate regime. So far, we have coupled into a magnetic guide a flux of a few 108 atoms/s at 60 cm/s with a propagation in the guide over more than 2 meters. At this stage, the collision rate is not high enough to start an efficient forced evaporative cooling. Here we describe a new approach to reach the collisional regime. It is based on a pulsed feeding of the magnetic guide at a high repetition rate. The overlap of the packets of atoms occurs in the guide and leads to a continuous guided beam. We discuss different ways to increase the collision rate of this beam while keeping the phase space density constant by shaping the external potential.
© EDP Sciences 2004