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The Advanced Virgo Photon Calibrators

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arxiv 2009.08103 v2 pith:PQ6PVOPB submitted 2020-09-17 astro-ph.IM gr-qc

The Advanced Virgo Photon Calibrators

D. Estevez , P. Lagabbe , A. Masserot , L. Rolland , M. Seglar-Arroyo , D. Verkindt This is my paper
classification astro-ph.IM gr-qc
keywords virgoadvancedcalibrationpcalligobeencalibratorsdetectors
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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As the sensitivities of LIGO, Virgo and KAGRA detectors improve, calibration of the interferometers output is becoming more and more important and may impact scientific results. For the observing run O3, Virgo used for the first time photon calibrators (PCal) to calibrate the interferometer, using radiation pressure of a modulated auxiliary laser beam impinging on the Advanced Virgo end mirrors. Those optical devices, also used in LIGO, are now the calibration reference for the global gravitational wave detectors network. The intercalibration of LIGO and Virgo PCals, based on the same absolute reference called the Gold Standard, has allowed to remove a systematic bias of 3.92% that would have been present in Virgo calibration using the PCal. The uncertainty budget on the PCal-induced displacement of the end mirrors (NE and WE) of Advanced Virgo has been estimated to be 1.36% for O3a and 1.40% on NE PCal (resp. 1.74% on WE PCal) for O3b. This uncertainty is the limiting one for the global calibration of Advanced Virgo. It is expected to be reduced below 1% for the next observing runs.

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