2010
DOI: 10.1088/0264-9381/27/19/194011
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Noise from scattered light in Virgo's second science run data

Abstract: Virgo is one of the large, ground-based interferometers aimed at detecting gravitational waves. One of the technical problems limiting its sensitivity is caused by light in the output beams which is backscattered by seismically excited surfaces and couples back into the main beam of the interferometer. The resulting noise was thoroughly studied, measured and mitigated before Virgo's second science run (VSR2). The residual noise during VSR2, which increases in periods with a large microseism activity, is accura… Show more

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Cited by 83 publications
(71 citation statements)
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“…Scattered light is a common source of noise in the LIGO and Virgo detectors. Stray light is reflected back into the main interferometer path, resulting in excess power in the data [91,229,230]. Motion of the reflective surface, such as optic mounts, phase shift the reflected light.…”
Section: Scattered Lightmentioning
confidence: 99%
See 1 more Smart Citation
“…Scattered light is a common source of noise in the LIGO and Virgo detectors. Stray light is reflected back into the main interferometer path, resulting in excess power in the data [91,229,230]. Motion of the reflective surface, such as optic mounts, phase shift the reflected light.…”
Section: Scattered Lightmentioning
confidence: 99%
“…The strain noise amplitude of scattered light instrumental artifacts correlates with the intensity of the corresponding ground motion. Additionally, higher velocities of optic motion lead to higher-frequency content in the scattered light [229].…”
Section: Scattered Lightmentioning
confidence: 99%
“…Scattered light is intrinsically non-stationary, since the amplitude and maximum frequency of this noise source depend on the motion of the scattering element. 4 Scattered light has been mitigated with a careful placement of black glass absorbing baffles and beam dumps. All spurious beams from the anti-reflection coated surfaces are intercepted and dumped.…”
mentioning
confidence: 99%
“…In addition the increased seismic isolation will also help in reducing scattered light. Indeed, scattered light up-conversion is highly non-linear: 4 residual motion at few Hz will be the dominant contributor to scattered light phase noise, while the slower 100 mHz motion that we will introduce to periodically stress the cantilevers results in a negligible contribution. The second potentially problematic non-stationary noise source can be traced to the actuation chain which used to apply force on the two test cantilevers.…”
mentioning
confidence: 99%
“…This noise is typically not of a fundamental nature (like shot-noise for example) but coming from other technical sources like scattered light [11] or electronic noise. The contribution of this spurious coupling mechanisms to the detector sensitivity can be directly estimated by means of projection measurements, as already explained in Section 4 of [4].…”
Section: Noise Couplings To Gravitational Channelmentioning
confidence: 99%