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.
|Autori:||Muller JH; Morsch O; Ciampini D; Anderlini M; Mannella R; Arimondo E|
|Titolo:||Beyond the usual approximations: Time-dependent magnetic traps revisited|
|Anno del prodotto:||2001|
|Digital Object Identifier (DOI):||10.1016/S1296-2147(01)01188-X|
|Appare nelle tipologie:||1.1 Articolo in rivista|