De Rosa, Rosario and Garufi, Fabio and La Rana, Adele and Milano, Leopoldo (2011) An optical readout system for the drag free control of the LISA spacecraft. [Pubblicazione in rivista scientifica]

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Tipologia del documento:	Pubblicazione in rivista scientifica
Titolo:	An optical readout system for the drag free control of the LISA spacecraft
Autori:	Autore Email De Rosa, Rosario [non definito] Garufi, Fabio [non definito] La Rana, Adele [non definito] Milano, Leopoldo [non definito]
Autore/i:	Di Fiore, L.; Grado, A.
Data:	Gennaio 2011
Numero di pagine:	6
Dipartimento:	Scienze fisiche
Sezione di dipartimento:	UniTA
Numero identificativo:	10.1016/j.astropartphys.2010.10.014
URL ufficiale:	http://www.sciencedirect.com/science/article/pii/S...
Titolo del periodico:	Astroparticle Physics
Data:	Gennaio 2011
ISSN:	0927-6505
Volume:	34
Numero:	6
Intervallo di pagine:	pp. 394-400
Numero di pagine:	6
Parole chiave:	Gravitational wave detection; Interferometric space antenna; Inertial sensor; Drag free control; Optical sensor
Numero identificativo:	10.1016/j.astropartphys.2010.10.014
Settori scientifico-disciplinari del MIUR:	Area 02 - Scienze fisiche > FIS/07 - Fisica applicata (a beni culturali, ambientali, biologia e medicina)
Depositato il:	30 Giu 2011 14:15
Ultima modifica:	30 Apr 2014 19:46
URI:	http://www.fedoa.unina.it/id/eprint/8466

Abstract

LISA is an ESA–NASA joint project for the realization of a space interferometric gravitational wave (GW) antenna. LISA is designed for the measurement of GWs in a very low frequency band (0.1–100 mHz). The antenna is composed by three spacecraft (SC) in suitable heliocentric orbits placed at the corners of a huge equilateral triangle, each side being 5 million km long. The SCs are linked by lasers, forming a sort of optical transponder. By means of phase locking techniques, any round-trip phase delay change gives a measurement of a change in the SC distance (measured as light transit time), due to incoming GWs. An essential requirement is that the SCs are set as close as possible to pure geodetic motion, in the measurement frequency band. This is hardly fulfilled because the SCs are disturbed by several external forces, like solar radiation pressure, cosmic rays etc. In each SC there are two free falling proof masses (PM) that are as much isolated as possible by all external force but gravity. The relative position between each PM and the SC is measured, in six degrees of freedom, by the so-called inertial sensor (IS). The IS signal is then used for drag-free servo-loops that force the SC to follow the geodetic motion of the PMs. The current solution for the IS is the adoption of capacitive sensing. This gives a reliable device but poses several limitations due to back action and cross couplings. In this work, we present an optical lever sensor as an alternative solution. In particular we analyze the potential sensitivity and discuss the advantages in terms of relaxed specifications for the drag free control loops. We also report on bench-top measurements that confirm the performance in the required frequency band.

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