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We describe an experiment to produce 87Rb Bose-Einstein condensates in anoptically plugged magnetic quadrupole trap, using a blue-detuned laser. Due tothe large detuning of the plug laser with respect to the atomic transition, theevaporation has to be carefully optimized in order to efficiently overcome theMajorana losses. We provide a complete theoretical and experimental study ofthe trapping potential at low temperatures and show that this simple modeldescribes well our data. In particular we demonstrate methods to reliablymeasure the trap oscillation frequencies and the bottom frequency, based onperiodic excitation of the trapping potential and on radio-frequencyspectroscopy, respectively. We show that this hybrid trap can be operated in awell controlled regime that allows a reliable production of degenerate gases.

Rubidium-87 Bose-Einstein condensate in an optically plugged quadrupole trap