Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 40: Poster: Ultra-cold atoms, ions and BEC

A 40.23: Poster

Thursday, March 15, 2012, 16:30–19:00, Poster.V

Evaporation limited loading of an atomic trap — Markus Falkenau, •Valentin V Volchkov, Jahn Rührig, Hannes Gorniaczyk, Mesut Ceylan, Tilman Pfau, and Axel Griesmaier — 5.Physikalische Institut, Universität Stuttgart, Pfaffenwaldring 57, Stuttgart, 70569

Recently, we have experimentally demonstrated a continuous loading mechanism for an optical dipole trap from a guided atomic beam [1]. The observed evolution of the number of atoms and temperature in the trap are consequences of the unusual trap geometry. On this poster, we present a model based on a set of rate equations to describe the loading dynamics of such a mechanism. We consider the collision statistics in the non-uniform trap potential that leads to twodimensional evaporation. The comparison between the resulting computations and experimental data allows to identify the dominant loss process and suggests ways to enhance the achievable steady-state atom number and phase-space density.

[1] M. Falkenau, V. V. Volchkov, J. Rührig, A. Griesmaier and T. Pfau, Phys. Rev. Lett. 106, 163002 (2011).