We report the efficient production of a large Bose-Einstein condensate in ⁸⁷Rb atoms. This is achieved by quickly reducing the radio frequency of the magnetic field at a rate of -96.80.3em0exkHz∕s during the final stage of evaporative cooling, and we have produced a condensate with (2.2±0.1)×10⁶ atoms against a serious three-body recombination loss. We observed the dependence of the cooling efficiency on the rate at which the truncated energy changes by measuring the condensate growth for three kinds of radio-frequency sweep. The experimental results quantitatively agree with calculations based on the quantum kinetic theory of a Bose gas.
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Mukai et al. (2004) studied this question.
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