Beyond the usual approximations: Time-dependent magnetic traps revisited

Year: 2001

Authors: Mueller J.H., Morsch O., Ciampini D., Anderlini M., Mannella R., Arimondo E.

Autors Affiliation: Univ Pisa, Dipartimento Fis, INFM, I-56127 Pisa, Italy

Abstract: The motion of atoms in time-orbiting potential (TOP) traps is usually described by applying adiabatic and time-averaging approximations. In this work we show that careful experimental analysis reveals corrections to both of these approximations in the shape of a micromotion of the atoms at the frequency of the time-dependent trapping field and of a dependence of the equilibrium position of the atoms on the sense of rotation of the bias field. Whereas the former can be easily explained theoretically, the latter requires a more sophisticated analytical treatment involving geometric forces. We present experimental results and numerical simulations which agree well with the data. Furthermore, implications for Bose-Einstein condensation experiments are discussed. (C) 2001 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.

Journal/Review: COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE IV PHYSIQUE ASTROPHYSIQUE

Volume: 2 (4)      Pages from: 649  to: 656

KeyWords: Ultra-cold atoms
DOI: 10.1016/S1296-2147(01)01188-X

Citations: 5
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