Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Präzisionsmessungen und Metrologie 2

Q 11.6: Talk

Monday, March 12, 2012, 15:45–16:00, V7.03

Seismic isolation for the 10m Prototype — •Gerald Bergmann for the AEI 10m Prototype Team — Leibniz Universität Hannover und MPG für Gravitationsphysik (AEI),

A 10m arm length prototype interferometer is currently being setup at the AEI in Hanover, Germany. This facility will not only be used for developing novel techniques for future gravitational wave detectors but will also provide a platform for high precision experiments such as measuring the standard quantum limit (SQL). To achieve a suitable environment for these experiments, a very good isolation from the surrounding, especially from seismic motion, is required.

In this talk, the basic isolation stage will be introduced which is realized as a set of passive attenuation tables. These are based on the Advanced Ligo HAM-SAS design; geometric anti-spring filters provide vertical isolation, attenuation in the horizontal direction is provided by inverted pendulum legs. In first experiments, seismic attenuation of about 60dB at low frequencies could be shown by pure mechanical passive isolation. Several sensors and a Suspension Platform Interferometer will further be used to measure table motion signals. It will be fed back to actuators which will actively damp eigenmodes and position the tables in DC.