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Loading an ultra-cold ensemble into a static magnetic trap involvesunavoidable loss of phase space density when the gravitational energy dominatesthe kinetic energy of the ensemble. In such a case the gravitational energy istransformed into heat, making a subsequent evaporation process slower and lessefficient. We apply a high phase space loading scheme on a sub-doppler cooledensemble of Rubidium atoms, with a gravitational energy much higher than itstemperature of $1~\rm{\mu K}$. Using the regular configuration of a quadrupolemagnetic trap, but driving unequal currents through the coils to allow the trapcenter to fall, we dissipate most of the gravitational energy and obtain a20-fold improvement in the phase space density as compared to optimal loadinginto a static magnetic trap. Applying this scheme, we start an efficient andfast evaporation process as a result of the sub-second thermalization rate ofthe magnetically trapped ensemble.

High phase space density loading of a falling magnetic trap