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A: Fachverband Atomphysik

A 14: Poster: Precision spectroscopy of atoms and ions (with Q)

A 14.22: Poster

Monday, March 17, 2014, 16:30–18:30, Spree-Palais

Active control of the magnetic field in an ion trap — •Matthias Kreis, Stephan Kucera, and Jürgen Eschner — Experimentalphysik, Universität des Saarlandes, Saarbrücken, Germany

Experiments using coherent atom–photon interaction require control of the energy splitting of the involved atomic levels and therefore a controlled magnetic field. Magnetic–field noise is caused by electric appliances and current fluctuations in bias field coils but cannot directly be measured at the position of the trapped ions. We present a method for servo control of the magnetic field whereby we calculate the magnetic–field value at the ion’s location from values measured with several sensors positioned outside the trap chamber. We demonstrate the compensation of different noise contributions.