van Dongen, J., Prokhorov, L., Cooper, S. J., Barton, M. A., Bonilla, E., Dooley, K.L.  ORCID: https://orcid.org/0000-0002-1636-0233, Driggers, J. C., Effler, A., Holland, N. A., Huddart, A., Kasprzack, M., Kissel, J. S., Lantz, B., Mitchell, A. L., O'Dell, J., Pele, A., Robertson, C. and Mow-Lowry, C. M.
2023.
Reducing control noise in gravitational wave detectors with interferometric local damping of suspended optics.
Review of Scientific Instruments
94
(5)
, 054501.
10.1063/5.0144865
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Abstract
Control noise is a limiting factor in the low-frequency performance of the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO). In this paper, we model the effects of using new sensors called Homodyne Quadrature Interferometers (HoQIs) to control the suspension resonances. We show that if we were to use HoQIs, instead of the standard shadow sensors, we could suppress resonance peaks up to tenfold more while simultaneously reducing the noise injected by the damping system. Through a cascade of effects, this will reduce the resonant cross-coupling of the suspensions, allow for improved stability for feed-forward control, and result in improved sensitivity of the detectors in the 10–20 Hz band. This analysis shows that improved local sensors, such as HoQIs, should be used in current and future detectors to improve low-frequency performance.
| Item Type: | Article |
|---|---|
| Date Type: | Published Online |
| Status: | Published |
| Schools: | Physics and Astronomy |
| Publisher: | American Institute of Physics |
| ISSN: | 0034-6748 |
| Date of First Compliant Deposit: | 7 March 2024 |
| Date of Acceptance: | 26 April 2023 |
| Last Modified: | 20 Mar 2024 12:38 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/166991 |
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