1. Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Bremen, Germany;
2. Deutsches Zentrum für Luft- und Raumfahrt, Institute of Space Systems (DLR-RY), Bremen, Germany;
3. Max Planck Institute for Gravitational Physics (Albert Einstein Institute) and Institute for Gravitational Physics of the Leibniz Universität Hannover, Hannover, Germany