Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 18: Präzisionsmessungen und Metrologie III

Q 18.5: Vortrag

Dienstag, 11. März 2008, 15:00–15:15, 3D

Novel LISA Payload Architectures with In-Field Pointing — •Dennis Weise¹, Pierangelo Marenaci¹, Peter Weimer¹, Hans Reiner Schulte¹, Peter Gath¹, Claus Braxmaier², Ulrich Johann¹, and Marcello Sallusti³ — ¹EADS Astrium GmbH, Claude-Dornier-Str., 88039 Friedrichshafen — ²HTWG Konstanz, Brauneggerstr. 55, 78462 Konstanz — ³European Space Agency, P.O. Box 299, 2200 AG Noordwijk ZH, The Netherlands

As ESA’s prime contractor within the on-going LISA Mission Formulation Study, EADS Astrium has recently suggested and investigated payload architectures utilizing so-called “In-Field Pointing” for accommodation of seasonal constellation dynamics. Here, the annual variation in the angle between the interferometer arms of roughly ± 1^∘ is compensated by steering the lines of sight of the individual telescopes with a comparatively small actuated mirror located in an intermediate pupil plane inside the telescopes. This introduces a high flexibility for the overall payload configuration and allows for the realization of very compact designs. We will show that despite the presence of an active mirror in the measurement chain it should be feasible to achieve the required pciometer pathlength stability over relevant timescales by employing a specifically designed telescope and a special Gimbal-type pointing mechanism. In combination, these minimize pathlength disturbances to design-values below 1 pm/√Hz by passive means in the measurement band. According payload architectures with both a single active proof mass and two active proof masses per spacecraft will be presented.