Hannover 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 29: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 29.7: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Imaging vortices in a Bose–Einstein condensate with tracer particles — •Chris Billington^{1, 2}, Philip Starkey¹, Shaun Johnstone¹, Mikhail Egorov¹, and Kristian Helmerson¹ — ¹School of Physics, Monash University, Victoria, Australia — ²Physikalisches Institut, Universität Tübingen, Tübingen, Germany

Vortex cores in Bose–Einstein condensates are minima in atomic density. As such, an atom experiencing repulsive interactions with a condensate will see vortex cores as potential wells, and may become trapped within them. We are developing an experiment to image vortices in-situ using this effect. We will introduce ⁸⁷Rb atoms to a ⁴¹K condensate containing vortices, and image the ⁸⁷Rb atoms in order to discern the positions of vortex cores.

In order to perform this and other experiments, we have developed a powerful control and analysis system called labscript. In labscript, experiments are written as code in a high level language, before being compiled to hardware instructions suitable for programming into devices. Many such experiments can be compiled at once—scanning over one or more input parameters to the experiment—and will be queued up and executed one after the other on the hardware. User-written analysis routines run automatically as new data arrives from the experiment, with plots updating in real time. Analysis results can also determine the input parameters to the next experiment, which we use for closed loop optimization of experiment results using a genetic algorithm.