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A: Fachverband Atomphysik
A 2: Ultracold atoms and BEC - I (with Q)
A 2.3: Vortrag
Montag, 6. März 2017, 15:15–15:30, N 1
QUANTUS-2 - Ultra Low Expansion Atomic Source for Matter Wave Interferometry in Extended Free Fall — •Peter Stromberger1, Alexander Grote1, Andre Wenzlawski1, Patrick Windpassinger1, and the QUANTUS-Team1,2,3,4,5,6,7 — 1Institut für Physik, Johannes Gutenberg Universität Mainz — 2Institut für Physik, Humboldt-Universität zu Berlin — 3Ferdinand-Braun-Institut, Leibniz Institut für Höchstfrequenztechnik Berlin — 4Institut für Quantenoptik, Leibniz-Universität Hannover — 5ZARM, Universität Bremen — 6Institut für Quantenphysik, Universität Ulm — 7Institut für angewandte Physik, TU Darmstadt
QUANTUS-2 is a mobile high-flux rubidium BEC source used for experiments under microgravity in the drop tower in Bremen. To further decrease the expansion rate of the BEC, magnetic lensing - also known as delta-kick cooling - is crucial for observations after long evolution times in the range of seconds. Long evolution times are desirable, because the sensitivity of atom interferometers enhances quadratically with the interrogation time. Here we present our results of a lens, which leads to an observability of the BEC of up to 2.7 s after free expansion. This expansion rate is equivalent to an expansion rate of a thermal ensemble with a temperature below 100 pK in all three dimensions.
The QUANTUS project is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economic Affairs and Energy under grant numbers DLR 50 WM 1552-1557.