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| The schematic shows the time sequence of the experiment.
(A) The sample was exposed to the magnetic field of interest for 0 - 14 ms and analyzed in-situ for loss measurement or after 4.6 ms time-of-flight for the measurement of kinetic energy and the axial size of the cloud. The Feshbach fields were suddenly switched off at a rate of 1G/μs, preventing the conversion of interaction energy into kinetic energy during the expansion.
(B) This absorption image shows the |1> component of the cloud trapped at 812 G (left), and after 4.6 ms ballistic expansion imaged at zero field (right). The field of view is 840μm×550μm. The magnetic field ramp was limited by eddy currents to 4.5 ms. Spectroscopic measurements of the magnetic field showed that the field was trailing behind the current which was controlled with a time constant faster than 1 ms.
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