Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 5: Precision Measurements and Metrology I
Q 5.9: Talk
Monday, March 11, 2019, 12:30–12:45, S SR 111 Maschb.
A highly homogeneous magnetic environment for Very Long Baseline Atom Interferometry — •Etienne Wodey1, Michael Müller2, Mischa Widmer2, Urs Schläpfer2, Stefan Stuiber3, Dorothee Tell1, Wolfgang Ertmer1, Christian Schubert1, Dennis Schlippert1, Peter Fierlinger3, and Ernst M. Rasel1 — 1Leibniz Universität Hannover — 2IMEDCO AG — 3Technische Universität München
Atom-interferometric measurement instruments of e.g. inertial forces owe their remarkable stability and well-known bias to the fine understanding of interactions between the atoms and external fields. Controlling spurious fields coupling to the atomic test masses is therefore of utmost importance. Here, magnetic field gradients play a dominant role through the quadratic Zeeman effect which is not canceled for states with vanishing magnetic quantum number.
In this contribution, we present the baseline section of the Hannover Very Long Baseline Atom Interferometry facility (VLBAI). In a fully passive and scalable design, we realized a ten-meter long magnetic shield that provides high magnetic field homogeneity over more than eight meters length. This allows constraining the corresponding error for acceleration measurements to a few parts in 1013. A paramagnetic ultra-high vacuum vessel equipped with temperature sensors distributed along the whole length completes the part to make it suitable for high-performance atom interferometry.
The VLBAI facility is a major research instrument funded by the DFG with support from the CRCs 1128 “geo-Q” and 1227 “DQ-mat”.