Measuring the Virgo area tilt noise with a laser gyroscope

TL;DR

This paper presents measurements of tilt noise at the Virgo gravitational wave detector site using a ring laser gyroscope, exploring its potential to enhance seismic suspension control systems.

Contribution

It demonstrates the use of a ring laser gyroscope to measure tilt noise and assesses its coherence with existing control signals for improved seismic control.

Findings

High coherence between ring laser signal and control signals in 20-200 mHz range

Potential for using laser gyroscope data to improve seismic suspension control

Successful measurement of tilt noise at Virgo site

Abstract

We report on the measurements of tilt noise performed at the Virgo site with a ring laser gyroscope. The apparatus is a He-Ne laser operating in a square cavity mounted on a vertical plane perpendicular to the north-south arm of the inteferometer. We discuss the possibility of using the ring laser signal to improve the performances of the control system of the Virgo seismic suspensions. The comparison between the ring laser signal and the control signals for the longitudinal translations of the inverted pendulum (IP) shows remarkable coherence in the frequency range 20-200 mHz.