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Q: Fachverband Quantenoptik und Photonik

Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology

Q 16.69: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

The AEI-SAS: Seismic isolation for the 10 m Prototype Interferometer — •Gerald Bergmann — for the AEI 10 m Prototype Team

A 10 m arm length prototype interferometer is currently being set up at the AEI in Hannover, Germany. This facility will not only be used for developing novel techniques for future gravitational wave detectors, but furthermore it will provide a platform for high precision experiments such as measuring the standard quantum limit (SQL) of interferometry. To achieve the high requirements on displacement noise for these experiments very good isolation from seismic motion is required.
The first stage of seismic isolation for the 10 m prototype interferometer is a set of passively isolated optical tables. Geometric anti-spring filters provide vertical attenuation, and the tables are mounted on inverted pendulum legs which provide isolation in horizontal direction. Purely mechanically passive attenuation of more than 60 dB below 10 Hz was shown in first experiments. The table motion agrees very well with the predicted performance. Several sensors and a Suspension Platform Interferometer measure the residual table motion. These signals are used for actively controling the tables. This even improve the passive table’s performance around its fundamental resonances. Currently two out of three tables are installed in the vacuum envelope.