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Tilt-to-length coupling in LISA Pathfinder: A data analysis


Abstract

We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimizing routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.

Abstract

We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimizing routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Nuclear and High Energy Physics
Language:English
Date:3 November 2023
Deposited On:01 Jan 2024 14:48
Last Modified:28 Jun 2024 03:32
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/physrevd.108.102003
Project Information:
  • : FunderDeutsches Zentrum für Luft- und Raumfahrt
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  • : FunderBundesministerium für Wirtschaft und Energie
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  • : FunderDeutsche Forschungsgemeinschaft
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  • : FunderCentre National d’Etudes Spatiales
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  • : FunderCentre National de la Recherche Scientifique
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  • : FunderObservatoire de Paris, Université de Recherche Paris Sciences et Lettres
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  • : FunderUniversité Paris Diderot
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  • : FunderLabex UnivEarthS
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  • : FunderUniversité Sorbonne Paris Cité
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  • : FunderAgence Nationale de la Recherche
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  • : FunderAgenzia Spaziale Italiana
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  • : FunderIstituto Nazionale di Fisica Nucleare Sezione di Padova
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  • : FunderMinisterio de Ciencia e Innovación
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  • : FunderMinisterio de Economía y Competitividad
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  • : FunderAgència de Gestió d’Ajuts Universitaris i de Recerca
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  • : FunderGeneralitat de Catalunya
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  • : FunderEidgenössische Technische Hochschule Zürich
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  • : FunderEuropean Space Agency
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  • : FunderSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
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  • : FunderUK Space Agency
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  • : FunderScottish Universities Physics Alliance
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  • : FunderUniversity of Glasgow
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  • : FunderUniversity of Birmingham
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  • : FunderImperial College London
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  • : FunderNational Aeronautics and Space Administration
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  • : FunderSwiss Space Office
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  • Content: Published Version
  • Language: English
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)