End benches scattered light modeling and subtraction in Advanced Virgo

Abstract

Advanced Virgo end benches were a significant source of scattered light noise during the third observing run that lasted from April 1 2019 until March 27 2020. We describe how that noise could be subtracted using auxiliary channels during the online strain data reconstruction. We model in detail the scattered light noise coupling and demonstrate that further noise subtraction can be achieved. We also show that the fitted model parameters can be used to optically characterized the interferometer and in particular provide a novel way of establishing an absolute calibration of the detector strain data.

arXiv comment12 pages, 5 figures, Accepted in Class. Quantum Grav

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• Calibration of Advanced Virgo and reconstruction of detector strain h(t) during the Observing Run O3
• Tunable coherence laser interferometry: demonstrating 40dB of straylight suppression and compatibility with resonant optical cavities
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