Freiburg 2019 – wissenschaftliches Programm
FM 12.7: Talk
Montag, 23. September 2019, 15:45–16:00, 2006
An optical dipole trap as a source of ultracold atoms in microgravity; the PRIMUS project — •Christian Vogt1, Marian Woltmann1, Sven Herrmann1, and the PRIMUS Team1,2 — 1University of Bremen, Center of Applied Space Technology and Microgravity (ZARM) — 2LU Hannover, Institute of Quantum Optics
Cold atom based sensor have proven to be effective tools with wide applications in measuring weakest forces and thereby in testing fundamental physics e.g. the weak equivalence principle. As the sensitivity of atom interferometer measurements scales with the square of interrogation time, great effort has been made to bring these techniques to microgravity (µ g) environments. For example the first BEC in space was created and effective temperatures down to the pK regime were demonstrated in the drop tower in Bremen. While all of these results in µ g were achieved with magnetic traps on atom chips, the PRIMUS-project develops an optical dipole trap for use in weightlessness as an alternative source of cold atom ensembles. Dipole traps have several advantages like a symmetric trap shape and the accessibility of Feshbach resonances. They are well established in ground-based experiments and will most likely play a significant role in space-borne experiments as well. In this manner our project also serves as a pathfinder experiment for future cold atom experiments in weightlessness. With this talk we will present the current staus of the experiment and latest results of evaporative cooling in an optical dipole trap in µ g. The PRIMUS-Project is supported by the DLR with funds provided by the BMWi under grant No. DLR 50 WM 1642.