Actuation crosstalk in free-falling systems: Torsion pendulum results for the engineering model of the LISA pathfinder gravitational reference sensor

Year: 2018

Authors: Bassan M.; Cavalleri A.; De Laurentis M.; De Marchi F.; De Rosa R.; Di Fiore L.; Dolesi R.; Finetti N.; Garufi F.; Grado A.; Hueller M.; Marconi L.; Milano L.; Minenkov Y.; Pucacco G.; Stanga R.; Vetrugno D.; Visco M.; Vitale S.; Weber W.J.

Autors Affiliation: Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133 Roma, Italy; INFN – Sezione di Roma Tor Vergata, I-00133 Roma, Italy; Dipartimento di Fisica, Università di Trento and INFN – TIFPA, I-38050 Povo (TN), Italy; Dipartimento di Fisica, Università di Napoli “Federico II”, I-80126, Napoli, Italy; INFN – Sezione di Napoli, I-80126, Napoli, Italy; Dipartimento di Ingegneria Meccanica e Aerospaziale, DIMA, Sapienza, Università di Roma – 00184 Roma, Italy; Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell

Abstract: In this paper we report on measurements on actuation crosstalk, relevant to the gravitational reference sensors for LISA Pathfinder and LISA. In these sensors, a Test Mass (TM) falls freely within a system of electrodes used for readout and control. These measurements were carried out on ground with a double torsion pendulum that allowed us to estimate both the torque injected into the sensor when a control force is applied and, conversely, the force leaking into the translational degree of freedom due to the applied torque.
The values measured on our apparatus (the engineering model of the LISA Pathfinder sensor) agree to within 0.2% (over a maximum measured crosstalk of 1%) with predictions of a mathematical model when measuring force to torque crosstalk, while it is somewhat larger than expected (up to 3.5%) when measuring torque to force crosstalk. However, the values in the relevant range, i.e. when the TM is well centered (+/- 10 mu m) in the sensor, remain smaller than 0.2%, satisfying the LISA Pathfinder requirements. (C) 2017 Elsevier B.V. All rights reserved.


Volume: 97      Pages from: 19  to: 26

KeyWords: Control equipment; Degrees of freedom (mechanics); Pendulums; Space probes; Torsional stress, Actuation; Degree of freedom; Engineering modeling; Gravitational reference sensors; Inertial motions; LISA; LISA Pathfinder; Torsion pendulum; Crosstalk
DOI: 10.1016/j.astropartphys.2017.10.010

Citations: 8
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