Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Precision Measurements and Metrology (Gravity and Miscellaneous) (joint session Q/A)

Q 58.3: Vortrag

Donnerstag, 8. März 2018, 11:00–11:15, K 2.013

Sensor noise measurements for an improved active seismic isolation of the AEI 10m-Prototype — •Robin Kirchhoff — Albert-Einstein / Max-Planck Institut für Gravitationsphysik Hannover, Callinstraße 38, 30167 Hannover

Large scale, ground based interferometric gravitational wave detectors use a combination of passive isolation and active control loops to reduce the coupling of seismic motion into the Michelson interferometer. The active isolation is limited by the self-noise of the in-loop sensors and a precise characterization of this noise is needed to optimize the control loops. In the Albert-Einstein-Institute in Hannover, the Sub-SQL (standard quantum limit) interferometer is under construction, which is a 10 m Michelson interferometer designed to be limited by quantum noise for prototyping techniques to surpass the SQL. To reach the quantum noise limit, all classical and technical noise sources, including seismic noise, must be suppressed below quantum noise levels. The seismic attenuation system (AEI-SAS) provides the required seismic pre-isolation of an optical platform using both passive and active techniques. Several huddle tests were performed using these seismically isolated platforms to precisely measure the noise of different inertial sensors and their amplifier electronics. The initially installed Sercel L-22D geophones were measured to have a higher self-noise compared to Sercel L-4C geophones. The geophones were therefore exchanged and the resulting improvement of the active isolation performance of the AEI-SAS was verified.