LISA Pathfinder Performance Confirmed in an Open-Loop Configuration: Results from the Free-Fall Actuation Mode

30 Aug 2019 Armano M. Audley H. Baird J. Binetruy P. Born M. Bortoluzzi D. Castelli E. Cavalleri A. Cesarini A. Cruise A. M. Danzmann K. Silva M. de Deus Diepholz I. Dixon G. Dolesi R. Ferraioli L. Ferroni V. Fitzsimons E. D. Freschi M. Gesa L. Gibert F. Giardini D. Giusteri R. Grimani C. Grzymisch J. Harrison I. Hartig M-S. Heinzel G. Hewitson M. Hollington D. Hoyland D. Hueller M. Inchauspé H. Jennrich O. Jetzer P. Karnesis N. Kaune B. Korsakova N. Killow C. J. Lobo J. A. Liu L. Llopez-Zaragoza J. P. Maarschalkerweerd R. Mance D. Meshksar N. Martìn V. Martin-Polo L. Martino J. Martin-Porqueras F. Mateos I. McNamara P. W. Mendes J. Mendes L. Nofrarias M. Paczkowski S. Perreur-Lloyd M. Petiteau A. Pivato P. Plagnol E. Ramos-Castro J. Reiche J. Robertson D. I. Rivas F. Russano G. Slutsky J. Sopuerta C. F. Sumner T. Texier D. Thorpe J. I. Vetrugno D. Vitale S. Wanner G. Ward H. Wass P. J. Weber W. J. Wissel L. Wittchen A. Zweifel P.

We report on the results of the LISA Pathfinder (LPF) free-fall mode experiment, in which the control force needed to compensate the quasistatic differential force acting on two test masses is applied intermittently as a series of "impulse" forces lasting a few seconds and separated by roughly 350 s periods of true free fall. This represents an alternative to the normal LPF mode of operation in which this balancing force is applied continuously, with the advantage that the acceleration noise during free fall is measured in the absence of the actuation force, thus eliminating associated noise and force calibration errors... (read more)

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