Evaporative Cooling of a Guided Rubidium Atomic Beam

Details Evaporative Cooling of a Guided Rubidium Atomic Beam Evaporative Cooling of a Guided Rubidium Atomic Beam

2005-05-30

arxiv.org/abs/cond-mat/0505709v1

Physical Review A 72 (2005) 033411

Physics

Condensed Matter

Other Condensed Matter

10 pages, 8 figures

Scientific paper

10.1103/PhysRevA.72.033411

We report on our recent progress in the manipulation and cooling of a magnetically guided, high flux beam of $^{87}{\rm Rb}$ atoms. Typically $7\times 10^9$ atoms per second propagate in a magnetic guide providing a transverse gradient of 800 G/cm, with a temperature $\sim550$ $\mu$K, at an initial velocity of 90 cm/s. The atoms are subsequently slowed down to $\sim 60$ cm/s using an upward slope. The relatively high collision rate (5 s$^{-1}$) allows us to start forced evaporative cooling of the beam, leading to a reduction of the beam temperature by a factor of ~4, and a ten-fold increase of the on-axis phase-space density.

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