Tilt-to-length coupling in LISA Pathfinder: Long-term stability

Author:

Armano M.1,Audley H.23,Baird J.4,Binetruy P.5,Born M.23,Bortoluzzi D.67,Castelli E.8,Cavalleri A.9,Cesarini A.10,Cruise A. M.11,Danzmann K.23,de Deus Silva M.1,Diepholz I.23,Dixon G.11,Dolesi R.8,Ferraioli L.12,Ferroni V.8,Fitzsimons E. D.13,Freschi M.1,Gesa L.1415,Giardini D.12,Gibert F.8,Giusteri R.23,Grimani C.10,Grzymisch J.1,Harrison I.1,Hartig M-S.23ORCID,Heinzel G.23,Hewitson M.23,Hollington D.16,Hoyland D.11,Hueller M.8,Inchauspé H.17,Jennrich O.1,Jetzer P.18,Johann U.19,Johlander B.1,Karnesis N.20,Kaune B.23,Killow C. J.21,Korsakova N.4,Lobo J. A.1415,López-Zaragoza J. P.14,Maarschalkerweerd R.1,Mance D.12,Martín V.1415,Martin-Polo L.1,Martin-Porqueras F.1,Martino J.4,McNamara P. W.1,Mendes J.1,Mendes L.1,Meshksar N.12,Nofrarias M.1415,Paczkowski S.23,Perreur-Lloyd M.21,Petiteau A.45,Plagnol E.4,Ramos-Castro J.22,Reiche J.23,Rivas F.23,Robertson D. I.21,Russano G.8,Sanjuan J.24,Slutsky J.25,Sopuerta C. F.1415,Sumner T.1624,Texier D.1,Thorpe J. I.25,Vetrugno D.8,Vitale S.8,Wanner G.32,Ward H.21,Wass P. J.1624,Weber W. J.8,Wissel L.23,Wittchen A.23,Zweifel P.12

Affiliation:

1. European Space Agency

2. Max Planck Institute for Gravitational Physics (Albert-Einstein-Institut)

3. Leibniz Universität Hannover

4. Université de Paris

5. Université Paris-Saclay

6. University of Trento

7. Trento Institute for Fundamental Physics and Application/INFN

8. Università di Trento

9. Istituto di Fotonica e Nanotecnologie

10. Università di Urbino Carlo Bo

11. University of Birmingham

12. ETH Zürich

13. The UK Astronomy Technology Centre

14. Institut de Ciències de l’Espai (ICE, CSIC)

15. Institut d’Estudis Espacials de Catalunya (IEEC)

16. Imperial College London

17. Universität Heidelberg

18. Universität Zürich

19. Airbus Defence and Space

20. Aristotle University of Thessaloniki

21. University of Glasgow

22. Universitat Politècnica de Catalunya

23. Universidad Loyola Andalucia

24. University of Florida

25. NASA Goddard Space Flight Center

Abstract

The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We show that they drifted slowly (by 1μm/rad and 6×106 in 100 days) and were strongly correlated to temperature changes within the satellite (8μm/rad/K and 30×106/K). Based on analytical tilt-to-length coupling models, we attribute the temperature-driven coupling changes to rotations of the test masses and small distortions in the optical setup. Particularly, our findings lead to the conclusion that LISA Pathfinder’s optical baseplate was bent during the cooldown experiment, which started in late 2016 and lasted several months. Published by the American Physical Society 2024

Funder

Bundesministerium für Wirtschaft und Energie

Deutsche Forschungsgemeinschaft

Centre National d’Etudes Spatiales

Centre National de la Recherche Scientifique

Observatoire de Paris, Université de Recherche Paris Sciences et Lettres

Agence Nationale de la Recherche

Agenzia Spaziale Italiana

Istituto Nazionale di Fisica Nucleare Sezione di Padova

Ministerio de Economía y Competitividad

Generalitat de Catalunya

Fundación General CSIC

ETH Zürich Foundation

European Space Agency

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

UK Space Agency

Scottish Universities Physics Alliance

University of Glasgow

University of Birmingham

Imperial College London

National Aeronautics and Space Administration

German Space Agency

Publisher

American Physical Society (APS)

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