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Q: Fachverband Quantenoptik und Photonik

Q 11: Poster: Quantum Optics and Photonics I

Q 11.9: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Simulation of magnetic chip traps — •Johannes Battenberg and Reinhold Walser — TU Darmstadt, Deutschland

Trapping magnetizable atoms with magnetic traps is the basic tool to experiments with ultracold atomic gases [1, 2, 3]. In the QUANTUS experiment, which is performed in the drop tower in Bremen (ZARM), the required magnetic field is created by a multi-layer microchip. These multiple current conducting layers provide a multitude of current combinations and offer a variety of different magnetic traps of different shapes, minimum locations and spatial alignments. From the experimental point of view, it is desirable to choose the general trap parameters and look up the required current. Therefore, one needs a simulation to provide this reverse map.

A modular framework was developed in Python to calculate the static magnetic field of the chip. We employ a finite element method using the Biot-Savart-Law. With this tool we can characterize the trap potential and identify key properties like trap frequencies and anharmonicities.

[1] W. Hänsel et al., Bose-einstein condensation on a microelectronic chip, Nature 413, 498–501 (2001)

[2] J. Fortágh and C. Zimmermann, Magnetic microtraps for ultracold atoms, Rev. Mod. Phys. 79, 235–289 (2007)

[3] R. Folman et al., Microscopic atom optics: From wires to an atom chip, Adv. At. Mol. Opt. Phys. 48, 263–356 (2002)