Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Ultracold Atoms (Trapping and Cooling)

Q 21.5: Talk

Tuesday, March 10, 2020, 15:15–15:30, f442

Evaluation of precooling Krypton for a Zeeman slower — •André Lohde, Ergin Simsek, Carsten Sieveke, Pablo Woelk, and Daniel Voigt — 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 measured by measuring the capturing rate in a MOT setup. For precooling the atoms to velocities below the MOT capture limit we use a Zeeman slower. The necessary beam forming is done with a capillary system and transverse laser cooling. The crucial preparation into the metastable state is done optically. We are aiming towards a short Zeeman slower setup so the beam diverges less and the atoms can be trapped more efficiently. Consequently at room temperature a large portion of the atoms are above the capture limit of the Zeeman slower. Liquid nitrogen or thermoelectric precooling increases the number of atoms below the capture limit. Additionally the metastable preparation efficiency is enhanced but also the beam forming by the capillary system is altered. In this talk we present precooling Krypton with both approaches, firstly a thermoelectric cooling and secondly liquid nitrogen cooling. We also give an evaluation based on simulations and measurements on how precooling enhances the efficiencies at different stages of our setup.