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LISA Pathfinder platform stability and drag-free performance - Working Papers


Armano, M; et al (2018). LISA Pathfinder platform stability and drag-free performance - Working Papers. arXiv 1812.05491, University of Zurich.

Abstract

The science operations of the LISA Pathfinder mission has demonstrated the feasibility of sub-femto-g free-fall of macroscopic test masses necessary to build a LISA-like gravitational wave observatory in space. While the main focus of interest, i.e. the optical axis or the x-axis, has been extensively studied, it is also of interest to evaluate the stability of the spacecraft with respect to all the other degrees of freedom. The current paper is dedicated to such a study, with a focus set on an exhaustive and quantitative evaluation of the imperfections and dynamical effects that impact the stability with respect to its local geodesic. A model of the complete closed-loop system provides a comprehensive understanding of each part of the in-loop coordinates spectra. As will be presented, this model gives very good agreements with LISA Pathfinder flight data. It allows one to identify the physical noise source at the origin and the physical phenomena underlying the couplings. From this, the performances of the stability of the spacecraft, with respect to its geodesic, are extracted as a function of frequency. Close to 1mHz, the stability of the spacecraft on the XSC, YSC and ZSC degrees of freedom is shown to be of the order of 5.0 10−15m s−2/Hz−−−√ for X and 4.0 10−14m s−2/Hz−−−√ for Y and Z. For the angular degrees of freedom, the values are of the order 3 10−12rad s−2/Hz−−−√ for ΘSC and 3 10−13rad s−2/Hz−−−√ for HSC and ΦSC.

Abstract

The science operations of the LISA Pathfinder mission has demonstrated the feasibility of sub-femto-g free-fall of macroscopic test masses necessary to build a LISA-like gravitational wave observatory in space. While the main focus of interest, i.e. the optical axis or the x-axis, has been extensively studied, it is also of interest to evaluate the stability of the spacecraft with respect to all the other degrees of freedom. The current paper is dedicated to such a study, with a focus set on an exhaustive and quantitative evaluation of the imperfections and dynamical effects that impact the stability with respect to its local geodesic. A model of the complete closed-loop system provides a comprehensive understanding of each part of the in-loop coordinates spectra. As will be presented, this model gives very good agreements with LISA Pathfinder flight data. It allows one to identify the physical noise source at the origin and the physical phenomena underlying the couplings. From this, the performances of the stability of the spacecraft, with respect to its geodesic, are extracted as a function of frequency. Close to 1mHz, the stability of the spacecraft on the XSC, YSC and ZSC degrees of freedom is shown to be of the order of 5.0 10−15m s−2/Hz−−−√ for X and 4.0 10−14m s−2/Hz−−−√ for Y and Z. For the angular degrees of freedom, the values are of the order 3 10−12rad s−2/Hz−−−√ for ΘSC and 3 10−13rad s−2/Hz−−−√ for HSC and ΦSC.

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Additional indexing

Item Type:Working Paper
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Physics and Astronomy (miscellaneous)
Language:English
Date:13 December 2018
Deposited On:25 Jan 2019 14:46
Last Modified:22 Dec 2020 08:27
Series Name:arXiv
ISSN:2331-8422
OA Status:Hybrid
Free access at:Official URL. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevD.99.082001
Official URL:https://arxiv.org/pdf/1812.05491.pdf
Related URLs:https://www.zora.uzh.ch/id/eprint/175979/
https://arxiv.org/abs/1812.05491

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