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Reducing scattered light in LIGO's third observing run

MPG-Autoren
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Bode,  N.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

Booker ,  P.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Liu,  J.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Meylahn,  F.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Willke,  B.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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2007.14876.pdf
(Preprint), 13MB

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Zitation

Soni, S., Austin, C., Effler, A., Schofield, R. M. S., Gonzalez, G., Frolov, V. V., et al. (2021). Reducing scattered light in LIGO's third observing run. Classical and Quantum Gravity, 38(2): 025016. doi:10.1088/1361-6382/abc906.


Zitierlink: https://hdl.handle.net/21.11116/0000-0006-D490-7
Zusammenfassung
Noise due to scattered light has been a frequent disturbance in the Advanced
LIGO gravitational wave detectors, hindering the detection of gravitational
waves. The non stationary scatter noise caused by low frequency motion can be
recognized as arches in the time-frequency plane of the gravitational wave
channel. In this paper, we characterize the scattering noise for LIGO's third
observing run O3 from April, 2019 to March, 2020. We find at least two
different populations of scattering noise and we investigate the multiple
origins of one of them as well as its mitigation. We find that relative motion
between two specific surfaces is strongly correlated with the presence of
scattered light and we implement a technique to reduce this motion. We also
present an algorithm using a witness channel to identify the times this noise
can be present in the detector.