Determination of the Stray Light-Induced Noise from the Baffle in the Cryogenic Trapping Area of Advanced Virgo in O5

Creators: Romero-Rodríguez, Alba; Martínez, Mario; Mir, Lluïsa M.; Yamamoto, Hiroaki

Abstract

As part of the Advanced Virgo upgrade for the O5 observation run in 2026, a more powerful laser and larger end mirrors in the Fabry–Perot cavities will be installed. The new optical configuration will increase the laser beam waist in the cryogenic trapping area close to the end towers. This could require enlarging the apertures in the vacuum pipe, now dictated by the presence of a baffle, in order to avoid beam clipping and noise due to coupling with baffle vibrations, potentially leading to a significant background to the gravitational-wave signals. This is a delicate operation that would require displacing the cryotrap and the end tower. In this study, we compute the expected back-scattering from the existing cryogenic trap baffle and compare it to the expected Virgo sensitivity in O5 to determine whether the existing hardware configuration constitutes a threat for the future performance of the detector.

Additional Information

© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Received: 20 June 2022 / Revised: 21 July 2022 / Accepted: 29 July 2022 / Published: 2 August 2022. (This article belongs to the Special Issue Research and Development for Gravitational Wave Detector). We would like to thank Michal Was and Jerome Degallaix for their continuous feedback and help. We also wanted to thank Irene Fiori, Antonino Chiummo, Antonio Pasqualetti and Maddalena Mantovani for their very useful contributions. Finally, we want to thank Eleonora Polini for providing the GPS times at which there were high micro-seisms and to Manuel Pinto for his help with the mechanical TF of the cryobaffle. This work is partially supported by the Spanish MCIN/AEI/ 10.13039/501100011033 under the grants SEV-2016-0588, PGC2018-101858-B-I00, and PID2020-113701GB-I00, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya. Part of this material is based upon work supported by LIGO Laboratory, a major facility operated by Caltech and MIT for the U.S. National Science Foundation and funded under Cooperative Agreement No. PHY-1764464. Author Contributions: Conceptualization, H.Y.; Formal analysis, A.R.-R. and H.Y.; Funding acquisition, M.M.; Investigation, A.R.-R., L.M.M. and H.Y.; Methodology, A.R.-R., L.M.M. and H.Y.; Supervision, M.M. and L.M.M.; Validation, H.Y., M.M. and L.M.M.; Writing—original draft, A.R.-R. and L.M.M.; Writing—review and editing, H.Y. All authors have read and agreed to the published version of the manuscript. The authors declare no conflict of interest. Institutional Review Board Statement: Not applicable. Informed Consent Statement: Not applicable. Data Availability Statement: Not applicable.

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