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Type: Journal article
Title: Reducing scattered light in LIGO's third observing run
Author: Soni, S.
Austin, C.
Effler, A.
Schofield, R.M.S.
Gonzalez, G.
Frolov, V.V.
Driggers, J.C.
Pele, A.
Urban, A.L.
Valdes, G.
Abbott, R.
Adams, C.
Adhikari, R.X.
Ananyeva, A.
Appert, S.
Arai, K.
Areeda, J.S.
Asali, Y.
Aston, S.M.
Baer, A.M.
et al.
Citation: Classical and Quantum Gravity, 2021; 38(2):025016-1-025016-23
Publisher: IOP Publishing
Issue Date: 2021
ISSN: 0264-9381
Statement of
S. Soni ... D D Brown ... A A Ciobanu ... D J Ottaway ... P J Veitch ... et al. (The LIGO Scientific Collaboration)
Abstract: 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 LIGOandVirgo’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 itsmitigation.We find that relativemotion 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.
Keywords: scattered light; LIGO; ground motion; interferometry
Description: Published 14 December 2020
Rights: © 2020 IOP Publishing Ltd
DOI: 10.1088/1361-6382/abc906
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