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Optics Communications

Time of flight technique to determine temperature of atoms in a ring-shaped trap

M. T. de Araújo, R. J. Horowicz, D. M. B. P. Milori, A M Tuboy, Robin Kaiser, Sérgio Carlos Zílio, Vanderlei Salvador Bagnato

Published Aug 1, 1995• 7 citations
Publisher
DOI
10.1016/0030-4018(95)00252-4

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We analyse the time-of-flight method of measuring the temperature of cold trapped atoms in the specific case of short distances of the probe beam from the trap centre and finite atomic cloud size. We theoretically examine the influence of the probe beam shape and its distance from the initial position of the cloud on the temperature evaluation. These results are then verified with a three-dimensional Monte Carlo simulation and applied to our experimental data to show that the proposed procedure allows accurate and reliable determination of the temperature.
School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332(Dated: February 2, 2008)We have created a Bose-Einstein condensate whose spin orientation is metastable. Condensateswere transferred into a quadrupole magnetic trap, where Majorana transitions limited the lifetime toa few hundred milliseconds, about 30 times the trapping period. Atoms held in the trap frequentlydisplayed a ring-shaped time-of-flight distribution. We speculate that such a ring could be either aquantized vortex or a feature of the Majorana loss dynamics in the quantum regime.