Parametrization selection and online adaptation of subtraction filters for gravitational wave detectors
Mathyn van Dael (Nikhef, Eindhoven University of Technology)
Marjolein Daanen (Eindhoven University of Technology)
Koen Tiels (Eindhoven University of Technology)
Gert Witvoet (TNO, Eindhoven University of Technology)
Bas Swinkels (Nikhef)
Diego Bersanetti (Sezione Di Genova)
Julia Casanueva (European Gravitational Observatory (EGO))
Manuel Pinto (European Gravitational Observatory (EGO))
Maddalena Mantovani (European Gravitational Observatory (EGO))
Piernicola Spinicelli (European Gravitational Observatory (EGO))
Camilla de Rossi (European Gravitational Observatory (EGO))
Mattia Boldrini (Sezione di Roma)
Paolo Ruggi (European Gravitational Observatory (EGO))
Tom Oomen (Eindhoven University of Technology, TU Delft - Mechanical Engineering)
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Abstract
Noise from auxiliary subsystems, amplified by their own control system, can couple to the output signal of gravitational wave detectors, limiting the maximum attainable sensitivity. Subtraction filters can be used to mitigate this coupling of noise by adding a secondary disturbance path with the purpose of canceling the noise in the output of the detector. The aim of this paper is to develop a systematic approach for the design and online adaptive estimation of subtraction filters. The proposed method adaptively updates the subtraction filter without the need for external perturbations to the system, providing a robust approach towards handling the time-varying couplings in the system as well as reducing the need for detector downtime. The method is validated on a representative simulation of the Advanced Virgo+ gravitational wave detector, illustrating that the method is capable of suppressing the coupling of noise from an auxiliary subsystem while the coupling varies over time.
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