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Q: Fachverband Quantenoptik und Photonik
Q 32: Poster: Quantum gases, ultracold atoms and molecules
Q 32.62: Poster
Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais
Optimization of guiding and trapping atomic beams on an atom chip — •Jan Mahnke1, Ilka Geisel1, Andreas Hüper1, Kai Cordes2, Wolfgang Ertmer1, and Carsten Klempt1 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2Institut für Informationsverarbeitung, Leibniz Universität Hannover
We investigate guiding and trapping of rubidium atoms on a mesoscopic chip structure with millimeter-scale wires. This structure is used to create a quadrupole field for a magneto-optical trap, a magnetic guide and a flexible magnetic trapping potential. With this setup, we are able to generate atomic beams with varying speed and temperature, as well as recapturing the launched atoms. These schemes usually require the control and timing of many mutually dependent currents, thus creating a wide range of experimental parameters. The optimization is a time-consuming task for a high-dimensional parameter space with unknown correlations.
Here we automate this process using a genetic algorithm based on Differential Evolution[1]. We find that this algorithm optimizes multiple correlated parameters and is robust against local maxima and experimental noise. The algorithm is flexible, easy to implement and finds better solutions than a manual search faster than existing methods. Especially atom chip experiments with their large sets of parameters, combined with short cycle times, highly benefit from an algorithm-based optimization. However, the proposed optimization is also applicable to a wide range of experimental setups.
[1] I. Geisel, Apll. Phys. Lett. 102, 214105 (2013)