LISA Pathfinder test mass injection in geodesic motion: status of the on-ground testing (Articolo in rivista)

Type
Label
  • LISA Pathfinder test mass injection in geodesic motion: status of the on-ground testing (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • D. Bortoluzzi, L. Baglivo, M. Benedetti, F. Biral, P. Bosetti, A. Cavalleri, M. Da Lio, M. De Cecco, R. Dolesi, M. Lapolla, W. Weber ans S. Vitale (2009)
    LISA Pathfinder test mass injection in geodesic motion: status of the on-ground testing
    in Classical and quantum gravity (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • D. Bortoluzzi, L. Baglivo, M. Benedetti, F. Biral, P. Bosetti, A. Cavalleri, M. Da Lio, M. De Cecco, R. Dolesi, M. Lapolla, W. Weber ans S. Vitale (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 26 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Pubblicazione su rivista ISI-JCR (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Mechanical and Structural Engineering and INFN, University of Trento, 38050 Trento, Italy Department of Mechanical Engineering, University of Padova, 35122 Padova, Italy Department of Materials Engineering and Industrial Technologies and INFN, University of Trento, 38050 Trento, Italy Department of Physics and INFN, University of Trento, 38050 Trento, Italy Thales Alenia Space Italia, 20090 Milano, Italy (literal)
Titolo
  • LISA Pathfinder test mass injection in geodesic motion: status of the on-ground testing (literal)
Abstract
  • : The LISA Technology Package (LTP) onboard the LISA Pathfinder mission aims to demonstrate, in orbit, several critical technology milestones for LISA, including the purest geodesic motion ever achieved for a macroscopic body. The gravitational reference sensor in the LTP hosts a heavy test mass (TM) surrounded by electrodes, at a relatively large ‘gap’ distance of several mm, which are used to measure and control the TM position and attitude. The large gaps-–necessary to minimize the force noise acting on the TM-–limit the available level of electrostatic actuation force that can be applied to the TM and thus the authority to control its position and velocity. Due to the large mass and gaps, a caging mechanism is required to securely hold the TM during the launch phase, when the whole payload endures large accelerations. Later in orbit, the TM must be injected into its geodesic trajectory, through the release from the caging mechanism and subsequent capture by the electrostatic actuation. During the release phase, the constraining device must limit adhesion forces that exert a net impulse upon rupture, such that the required forces needed to control the TM do not exceed the actuation authority. The TM injection into geodesic motion, and most critically the release phase, constitutes a potential point of failure for the mission. The on-ground verification of this phase is performed by measuring the momentum transferred between TM-representative surfaces and the release device, reproducing the dynamics that will take place in flight. This paper reports on the testing activities performed at the Department of Mechanical and Structural Engineering of the University of Trento (literal)
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