Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Ultracold Atoms (Trapping and Cooling)

Q 21.4: Talk

Tuesday, March 10, 2020, 15:00–15:15, f442

Slowing Krypton with Permanent Magnets — •Ergin Simsek, Carsten Sieveke, Pablo Woelk, Daniel Voigt, Malte Peters, and André Lohde — Carl Friedrich von Weizsäcker-Zentrum für Naturwissenschaft und Friedensforschung (ZNF), Universität Hamburg

Krypton is an excellent indicator for the detection of nuclear reprocessing activities and ground water dating. The Atom Trap Trace Analysis (ATTA) promises to be the next generation instrument for measuring the concentration of Krypton isotopes in air and water samples. Here the concentration is determined by measuring the capture rate in a MOT setup. For precooling the atoms to velocities below the MOT capture limit the use of a Zeeman slower is a suitable option. Due to the rapid development of magnetic materials in recent time, permanent magnets are now an attractive alternative to the commonly used magnetic coils for the generation of a strong and precisely shaped magnetic field. Our setup combines a purely optical preparation of metastable Krypton and a Zeeman Slower with transversal magnetic field in Halbach configuration, consisting of several small Neodym magnets. The transversal shape of the field makes it necessary to carefully prepare the atoms into the correct Zeeman sublevel. Here we present a thorough evaluation of our setup with respect to beam forming, metastable generation, state preparation and beam deceleration and analyse its suitability for ATTA.