TY - JOUR
T1 - Interferometric readout of a monolithic accelerometer, towards the fm/√Hz resolution
AU - van Heijningen, J. V.
AU - Bertolini, A.
AU - Van Den Brand, J. F J
PY - 2016/7/11
Y1 - 2016/7/11
N2 - The European Gravitational wave Observatory Virgo is undergoing an upgrade to increase its strain sensitivity to about 3×10-241/√Hz in the detection band of 10 Hz-10 kHz. The upgrade for this detector necessitates seismically isolating sensing optics in a vacuum environment that were on an optical bench outside vacuum in previous Virgo configurations. For this purpose, Nikhef has designed and built the five compact isolators, called MultiSAS. To measure the residual motion of the optical components and the transfer function of the isolator in full assembly, no (commercial) sensor is available that has sufficient sensitivity. A novel vibration sensor has been built at Nikhef that features an interferometric readout for a horizontal monolithic accelerometer. It will be able to measure in the vicinity of the fm/Hz regime from 10 Hz onwards. Current results show unprecedented (self) noise levels around 35 fm/Hz from 25 Hz onwards. In spite of these excellent results, it is still higher than the modeled noises. Several possible unmodeled noise sources and possible solutions have been identified.
AB - The European Gravitational wave Observatory Virgo is undergoing an upgrade to increase its strain sensitivity to about 3×10-241/√Hz in the detection band of 10 Hz-10 kHz. The upgrade for this detector necessitates seismically isolating sensing optics in a vacuum environment that were on an optical bench outside vacuum in previous Virgo configurations. For this purpose, Nikhef has designed and built the five compact isolators, called MultiSAS. To measure the residual motion of the optical components and the transfer function of the isolator in full assembly, no (commercial) sensor is available that has sufficient sensitivity. A novel vibration sensor has been built at Nikhef that features an interferometric readout for a horizontal monolithic accelerometer. It will be able to measure in the vicinity of the fm/Hz regime from 10 Hz onwards. Current results show unprecedented (self) noise levels around 35 fm/Hz from 25 Hz onwards. In spite of these excellent results, it is still higher than the modeled noises. Several possible unmodeled noise sources and possible solutions have been identified.
KW - Accelerometer
KW - Gravitational waves
KW - Interferometer
KW - Seismic attenuation
KW - Shot-noise limited
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U2 - 10.1016/j.nima.2015.09.108
DO - 10.1016/j.nima.2015.09.108
M3 - Article
AN - SCOPUS:84951768661
SN - 0168-9002
VL - 824
SP - 665
EP - 669
JO - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
ER -
