Düsseldorf 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 42: Präzisionsmessungen II
Q 42.1: Vortrag
Mittwoch, 21. März 2007, 14:00–14:15, 5K
New Payload Architectures for LISA — •Dennis Weise1, Wolfgang Holota1, Hans Reiner Schulte1, Peter Gath1, Claus Braxmaier1,2, and Ulrich Johann1 — 1EADS Astrium GmbH, Claude-Dornier-Str., 88090 Immenstaad — 2Fachhochschule Konstanz, Brauneggerstr. 55, 78462 Konstanz
We discuss new concepts for the realization of the LISA metrology system and payload, which have been developed in the context of the LISA Mission Formulation Study currently led by EADS Astrium under ESA contract. Main characteristic is the use of only a single active gravity reference sensor per spacecraft, which serves both associated interferometer arms. While such payload architectures offer an intrinsic elegance and conceptual simplicity, they pose new challenges for the optical payload design. In particular, new approaches are required for the compensation of constellation dynamics. The seasonal variation of the angle between the interferometer arms of approx. 60 ± 1∘ can for example be accommodated by a method known as “in-field pointing". Furthermore, newly introduced payload components include an off-axis telescope (Schiefspiegler), and an active optical truss for monitoring of detrimental path length changes within the optical system. Depending on the final realization of the payload architecture, alternative proof mass shapes (spherical or hexagonal) appear advantageous. The overall layout is driven by the requirement to minimize geometrical projection effects in the measurement chain.