We report on a double torsion pendulum, where motion along two degrees of freedom (DoFs) is almost free. The Test Mass (TM) is enclosed in a replica of the LISA-Pathfinder electrostatic readout and actuation system. This apparatus is designed to perform extensive ground testing of undesired effects such as leakage of the readout noise from one DoF to another, or actuation cross talks with closed feedback loop. Such investigation is relevant to the noise budget of LISA and LISA-Pathfinder missions, as the TM will be sensitive to weak forces along all 6 degrees of freedom (DoFs). The instrument being developed in Firenze is capable of measuring the forces and stiffnesses acting simultaneously along the 2 soft DoFs. We have completed an upgrade of the apparatus to a definitive configuration and we report on both advances in the commissioning tests and on measurements of residual charge, with the first DoF released.
A double torsion pendulum with two cascade soft degrees of freedom
Amaldi, Edoardo Amaldi conference on gravitational waves, 9, NRDA, Numerical Relativity - Data Analysis meeting, 2011 ; 012049/1-012049/6
2012
6 Seiten, 13 Quellen
Conference paper
English
Torsion Pendulum Investigation of Electromagnetic Inertia Manipulation Thrusting
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|Platform with six degrees of freedom
Engineering Index Backfile | 1965
|Reentry with two degrees of freedom
NTRS | 1958