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We report the efficient production of a large Bose-Einstein condensate in$^{87}$Rb atoms. This is achieved by quickly reducing the radio-frequency ofthe magnetic field at a rate of -96.8 kHz/s during the final stage ofevaporative cooling, and we have produced a condensate with ${(2.2 \pm 0.1)\times 10^{6}}$ atoms against a serious three-body recombination loss. Weobserved the dependence of the cooling efficiency on the rate at which thetruncated energy changes by measuring the condensate growth for three kinds ofradio-frequency sweep. The experimental results quantitatively agree withcalculations based on the quantum kinetic theory of a Bose gas.Comment: 5 pages, REVTeX4, 4 eps figures, Phys. Rev. A in pres

Efficient rapid production of a Bose-Einstein condensate by overcoming serious three-body loss