Stray light noise from particulate contamination in ground-based GW interferometers
- Document #:
- LIGO-G2502152-v1
- Document type:
- G - Presentations (eg Graphics)
Other Versions:
- Abstract:
- High sensitivity optical measurements, such as those performed in interferometric Gravitational Waves detectors, are prone to stray light noise. Due to the high-quality
optics used in the interferometers, light scattering may be dominated by the residual presence of particles. This can be an issue for the present LIGO and Virgo interferometers as well as for next generation detectors: Cosmic Explorer and
Einstein Telescope. It is therefore crucial to account for all possible light-dust interaction mechanisms and to estimate the noise they can generate. In our work, we performed a detailed analysis of particulate contamination focusing, as a case study, on the beam pipes of Einstein Telescope. There are two main cases for light scattering by particulate contamination inside the beampipes: particles deposited on the baffles and particles moving in the beam pipe volume under vacuum. We study these two cases separately and for each one we estimate
the amount of stray light noise impacting the detector sensitivity. We consider different scenarios of the environmental cleanliness and study the effects also for
different sizes and materials of the particles. This study allows us to establish upper limits on the number and size of dust particles that can be tolerated inside the pipe, therefore setting constraints on the cleanliness of environments and installation procedures. Our results refer specifically to Einstein Telescope, but they can be extended easily to other ground-based interferometers.
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- Associated with Events:
- BTW3 held from 30 Sep 2025 to 02 Oct 2025 in LIGO Hanford