Control of the laser frequency in the Virgo interferometer: Dynamic noise budgeting for controller optimization

Mathyn van Dael (Corresponding author), Julia Casanueva, Gert Witvoet, Bas Swinkels, Diego Bersanetti, Manuel Pinto, Paolo Ruggi, Maddalena Mantovani, Camilla de Rossi, Piernicola Spinicelli, Mattia Boldrini, Tom Oomen

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Abstract

This paper presents a framework for the derivation of a noise budget and the subsequent utilization in the optimization of the control design, using the laser frequency stabilization loop in the Virgo interferometer, which is a complex nested feedback system, as an experimental case study. First, the system dynamics and noise sources are modeled and experimentally verified to produce the noise budget, after which an optimization problem using the H2 norm is formulated and tailored to the specific design requirements for the detector. The structure of the synthesized controller is then used to produce an improved control design. Experimental verification of the developed controller on the Virgo interferometer shows roughly a factor 3 reduction in root-mean-square error, illustrating the effectiveness of the presented method.

Original languageEnglish
Article number103028
Number of pages11
JournalAstroparticle Physics
Volume164
Early online date8 Aug 2024
DOIs
Publication statusPublished - Jan 2025

Bibliographical note

Publisher Copyright:
© 2024 The Authors

Keywords

  • Advanced Virgo Plus
  • Gravitational Waves
  • Laser frequency stabilization
  • Noise budget
  • Systematic control design
  • ℋ synthesis

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