LISA Pathfinder platform stability and drag-free performance

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Title: LISA Pathfinder platform stability and drag-free performance
Authors: Armano, M
Audley, H
Baird, J
Binetruy, P
Born, M
Bortoluzzi, D
Castelli, E
Cavalleri, A
Cesarini, A
Cruise, AM
Danzmann, K
De Deus Silva, M
Diepholz, I
Dixon, G
Dolesi, R
Ferraioli, L
Ferroni, V
Fitzsimons, ED
Freschi, M
Gesa, L
Gibert, F
Giardini, D
Giusteri, R
Grimani, C
Grzymisch, J
Harrison, I
Heinzel, G
Hewitson, M
Hollington, D
Hoyland, D
Hueller, M
Inchauspe, H
Jennrich, O
Jetzer, P
Karnesis, N
Kaune, B
Korsakova, N
Killow, CJ
Lobo, JA
Lloro, I
Liu, L
Lopez-Zaragoza, JP
Maarschalkerweerd, R
Mance, D
Meshksar, N
Martin, V
Martin-Polo, L
Martino, J
Martin-Porqueras, F
Mateos, I
McNamara, PW
Mendes, J
Mendes, L
Nofrarias, M
Paczkowski, S
Perreur-Lloyd, M
Petiteau, A
Pivato, P
Plagnol, E
Ramos-Castro, J
Reiche, J
Robertson, DI
Rivas, F
Russano, G
Slutsky, J
Sopuerta, CF
Sumner, T
Texier, D
Thorpe, JI
Vetrugno, D
Vitale, S
Wanner, G
Ward, H
Wass, PJ
Weber, WJ
Wissel, L
Wittchen, A
Zweifel, P
Item Type: Journal Article
Abstract: The science operations of the LISA Pathfinder mission have demonstrated the feasibility of sub-femto-g free fall of macroscopic test masses necessary to build a gravitational wave observatory in space such as LISA. While the main focus of interest, i.e., the optical axis or the x-axis, has been extensively studied, it is also of great importance to evaluate the stability of the spacecraft with respect to all the other degrees of freedom (d.o.f.). The current paper is dedicated to such a study: the 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 component of the in-loop coordinates spectral density. As will be presented, this model gives very good agreement with LISA Pathfinder flight data. It allows one to identify the noise source at the origin and the physical phenomena underlying the couplings. From this, the stability performance of the spacecraft with respect to its geodesic is extracted as a function of frequency. Close to 1 mHz, the stability of the spacecraft on the XSC, YSC and ZSC d.o.f. is shown to be of the order of 5.0×10−15  m s−2 Hz−1/2 for X, 6.0×10−14  m s−2 Hz−1/2 for Y, and 4.0×10−14  m s−2 Hz−1/2 for Z. For the angular d.o.f., the values are of the order of 3×10−12  rad s−2  Hz−1/2 for ΘSC, 5×10−13  rad s−2  Hz−1/2 for HSC, and 3×10−13  rad s−2  Hz−1/2 for ΦSC. Below 1 mHz, however, the stability performances are worsened significantly by the effect of the star tracker noise on the closed-loop system. It is worth noting that LISA is expected to be spared from such concerns, as differential wave-front sensing, an attitude sensor system of much higher precision, will be utilized for attitude control.
Issue Date: 15-Apr-2019
Date of Acceptance: 8-Mar-2019
ISSN: 1550-2368
Publisher: American Physical Society
Journal / Book Title: Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume: 99
Issue: 8
Copyright Statement: © 2019 American Physical Society
Sponsor/Funder: Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST/R001871/1
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Physics, Particles & Fields
Publication Status: Published
Open Access location:
Article Number: ARTN 082001
Online Publication Date: 2019-04-16
Appears in Collections:Physics
High Energy Physics

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