Simulations of light distribution on new instrumented baffles surrounding Virgo end mirrors

TL;DR

This paper presents optical simulations of instrumented baffles with photosensors around Virgo end mirrors, demonstrating their potential to monitor stray light, detect mirror misalignments, and assist in pre-alignment during the Advanced Virgo upgrade.

Contribution

It introduces new optical simulations for instrumented baffles with photosensors, enhancing real-time stray light monitoring and mirror alignment in gravitational wave detectors.

Findings

Simulations show effective stray light monitoring capabilities.

Sensors can detect mirror misalignments and surface defects.

Potential to improve pre-alignment procedures in Virgo.

Abstract

As part of the second phase of Advanced Virgo upgrade program, instrumented baffles are being constructed to be installed around the end mirrors in the main arms, in continuation of what has been implemented for the input mode cleaner end mirror during phase I. These baffles will be equipped with photosensors, allowing for real-time monitoring of the stray light around the mirrors. In this paper, we present optical simulations of the light distribution in the detector main cavities to assess the ability of the sensors to effectively monitor misalignment and defects on the mirrors surface and to play a role in the pre-alignment of the interferometer.