Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Poster: Quantum Optics and Photonics II

Q 40.22: Poster

Wednesday, March 8, 2017, 17:00–19:00, P OG2

Magnetic shielding of an atomic chip trap — •Florian Grewe and Reinhold Walser — Institut für Angewandte Physik, Technische Universität Darmstadt, Hochschulstr. 4a, 64289 Darmstadt

In context of the QUANTUS project, degenerated quantum gases are created in weightlessness for high precision measurements. In order to achieve degeneracy, atoms have to be trapped and cooled down over several steps. A combination of coils and a carefully designed atomic chip [1, 2, 3, 4] is used to generated magnetic fields to trap, cool and manipulate the cold atomic gas. In addition to the atomic chip, there is a cylindrical mu-metal shielding to cancel the earth's magnetic field and other residual perturbations. Clearly, this shield has also an effect on the field created by the chip trap.

Here we present our analysis of the magnetic field inside the shielding leading to corrections of the atomic magnetic potential.

[1] W. Herr, Eine kompakte Quelle quantenentarteter Gase hohen Flusses für die Atominterferometrie unter Schwerelosigkeit, PhD thesis, Gottfried Wilhelm Leibniz Universität Hannover, 2013.

[2] J. Fortágh, C. Zimmermann, Rev. Mod. Phys. 79, 235 (2007).

[3] J. Schmiedmayer, et al., Adv. At. Mol. Opt. Phy. 48, 263 (2002).

[4] T. W. Hänsch, J. Reichel, et al., Nature 413, 498 (2001).