Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 26: Poster – Ultracold Matter (joint session Q/A)

A 26.20: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 2. OG

Design and Optimization of a Zeeman Slower for Ultracold Fermionic Dysprosium Experiments — •Ximeng Song, Paula Seyfert, Tim Pohlmann, Lennart Naeve, Lennart Hoenen, Philipp Lunt, and Lauriane Chomaz — Physikalisches Institut (Universität Heidelberg), Im Neuenheimer Feld 226, 69120 Heidelberg

Producing a high-flux, cool beam of atoms from a high-temperature, effusive oven is a fundamental prerequisite for any ultracold quantum gas experiment. The complex hyperfine structure of lanthanide atoms, such as Dysprosium, can render standard two-dimensional magneto-optical traps (2DMOT) inefficient due to optical pumping into dark states.

In this work, we present detailed analysis and optimization of a combined Zeeman slower (ZS) and 2DMOT as a primary cooling stage for ¹⁶¹Dy, based on analytical modelling and numerical simulations using the full 216-level hyperfine structure of the 421-nm cycling transition. We determine optimal magnetic-field profiles, laser detunings, and capture velocities. Crucially, the output of the ZS is matched to a low-gradient 2DMOT, whose parameters were likewise optimized for efficient capture of ¹⁶¹Dy at the reduced velocities. The combined ZS-2DMOT system yields a substantial increase in expected atomic flux into the science chamber, providing an experimentally feasible design for the precooling stage of our new fermionic dysprosium experiment.

References: S. Eckel, D. S. Barker, E. B. Norrgard, and J. Scherschligt. PyLCP: A Python package for computing laser cooling physics. Computer Physics Communications 270 (2022).

Keywords: Fermions; Ultracold Dysprosium; Zeeman Slower; 2D-MOT; Simulation