Determination of the light exposure on the photodiodes of a new instrumented baffle for the Virgo input mode cleaner end-mirror
As part of the upgrade program of the advanced Virgo interferometer, the installation of new instrumented baffles surrounding the main test masses is foreseen. As a demonstrator, and to validate the technology, the existing baffle in the area of the input mode cleaner end-mirror will be first replaced by a baffle equipped with photodiodes. This paper presents detailed simulations of the light distribution on the input mode cleaner baffle. They served to validate the proposed layout of the sensors in the baffle, and determine the light exposure of the photodiodes under different scenarios of the interferometer operations, in order to define mitigation strategies for preserving the detector integrity.
© 2020 IOP Publishing Ltd. Received 1 September 2020; Revised 26 November 2020; Accepted 27 November 2020; Published 24 December 2020. The authors gratefully acknowledge the European Gravitational Observatory (EGO) and the Virgo Collaboration for providing access to the facilities. 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 was partially supported by the Spanish MINECO under the Grant Nos. SEV-2016-0588 and PGC2018-101858 B-I00, some of which include ERDF funds from the European Union. IFAE is partially funded by the CERCA program of the Generalitat de Catalunya.
Submitted - 2008.13740.pdf