The Lisa test-mass (TM) is sensitive to weak forces along all 6 Degrees of Freedom (DoFs). Extensive ground testing is required in order to evaluate the influence of cross-talks of read-outs and actuators operating on different DoFs. To best represent the flight conditions, we developed in Firenze a facility with 2 soft DoFs. Using this facility we measure the forces and stiffnesses acting simultaneously along the 2 soft DoFs and, more specifically we will measure actuation cross-talks with closed feedback loop. The facility is now completed with a replica ao GRS (Gravitational Reference Sensor) and the flight model of the electronics boards.
Torsion Pendulum with 2 DoF for the study of residual couplings between the TM and the GRS: approaching thermal noise limited sensitivity / L. Marconi; R. Stanga; C. Grimani; M. Bassan; L. di Fiore; R. de Rosa; F. Garufi. - STAMPA. - 1:(2011), pp. 451-452. (Intervento presentato al convegno 46th Rencontres de Moriond on Gravitational Waves and Experimental Gravity tenutosi a La Thuile nel 20-27 Marzo 2011).
Torsion Pendulum with 2 DoF for the study of residual couplings between the TM and the GRS: approaching thermal noise limited sensitivity
MARCONI, LORENZO;STANGA, RUGGERO;
2011
Abstract
The Lisa test-mass (TM) is sensitive to weak forces along all 6 Degrees of Freedom (DoFs). Extensive ground testing is required in order to evaluate the influence of cross-talks of read-outs and actuators operating on different DoFs. To best represent the flight conditions, we developed in Firenze a facility with 2 soft DoFs. Using this facility we measure the forces and stiffnesses acting simultaneously along the 2 soft DoFs and, more specifically we will measure actuation cross-talks with closed feedback loop. The facility is now completed with a replica ao GRS (Gravitational Reference Sensor) and the flight model of the electronics boards.
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