Measurement of the stray light in the Advanced Virgo input mode cleaner cavity using an instrumented baffle

Creators: Ballester, O.; Blanch, O.; Cardiel, L.; Cavalli-Sforza, M.; Chiummo, A.; García, C.; Illa, J. M.; Karathanasis, C.; Kolstein, M.; Martínez, M.; Menéndez-Vázquez, A.; Mir, Ll M.; Mundet, J.; Romero-Rodríguez, A.; Serrano, D.; Yamamoto, H.

Abstract

A new instrumented baffle was installed in Spring 2021 at Virgo surrounding the suspended mirror in the input mode cleaner triangular cavity. It serves as a demonstrator of the technology designed to instrument the baffles in the main arms in the near future. We present, for the first time, results on the measured scattered light distribution inside the cavity as determined by the new device using data collected between May and July 2021, with Virgo in commissioning phase and operating with an input laser power in the cavity of 28.5 W. The sensitivity of the baffle is discussed and the data is compared to scattered light simulations.

Additional Information

© 2022 IOP Publishing Ltd. Received 17 January 2022; Revised 14 April 2022; Accepted 26 April 2022; Published 13 May 2022. The authors gratefully acknowledge the European Gravitational Observatory(EGO) and the Virgo Collaboration for providing access to the facilities and the support from EGO and the University of Pisa during the installation of the new instrument in Virgo. The LIGO Observatories were constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation under cooperative agreement PHY-9210038. The LIGO Laboratory operates under cooperative agreement PHY-1764464. 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. Data availability statement: The data that support the findings of this study are available upon reasonable request from the authors.

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