Large atom number Bose-Einstein condensate of sodium
K. M. R. van der Stam, E. D. van Ooijen, R. Meppelink, J. M. Vogels, P. van der Straten
Abstract
We describe the setup to create a large Bose-Einstein condensate containing more than 120x106 atoms. In the experiment a thermal beam is slowed by a Zeeman slower and captured in a dark-spot magneto-optical trap (MOT). A typical dark-spot MOT in our experiments contains 2.0x1010 atoms with a temperature of 320 microK and a density of about 1.0x1011 atoms/cm3. The sample is spin polarized in a high magnetic field, before the atoms are loaded in the magnetic trap. Spin polarizing in a high magnetic field results in an increase in the transfer efficiency by a factor of 2 compared to experiments without spin polarizing. In the magnetic trap the cloud is cooled to degeneracy in 50 s by evaporative cooling. To suppress the 3-body losses at the end of the evaporation the magnetic trap is decompressed in the axial direction.
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