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We have developed an evaporative cooling technique that accelerates thecirculation of an ultra-cold $^{87}$Rb gas, confined in a static harmonicpotential. As a normal gas is evaporatively spun up and cooled below quantumdegeneracy, it is found to nucleate vorticity in a Bose-Einstein condensate.Measurements of the condensate's aspect ratio and surface-wave excitations areconsistent with effective rigid-body rotation. Rotation rates of up to 94% ofthe centrifugal limit are inferred. A threshold in the normal cloud's rotationis observed for the intrinsic nucleation of the first vortex. The thresholdvalue lies below the prediction for a nucleation mechanism involving theexcitation of surface-waves of the ground-state condensate.Comment: 5 revtex pages, 3 embedded figure

Driving Bose-Einstein-Condensate Vorticity with a Rotating Normal Cloud