PETER: A DOUBLE TORSION PENDULUM TO TEST QUASI FREE-FALL ON TWO DEGREES OF FREEDOM

Di Fiore, L.; Bassan, M.; De Laurentis, M.; De Marchi, F.; De Rosa, R.; Finetti, N.; Garufi, F.; Grado, A.; Marconi, L.; Milano, L.

PETER: A DOUBLE TORSION PENDULUM TO TEST QUASI FREE-FALL ON TWO DEGREES OF FREEDOM

L. Di Fiore
(
- INFN, Naples
)
,
M. Bassan
(
- Rome U., Tor Vergata and
- INFN, Rome2
)
,
M. De Laurentis
(
- INFN, Naples and
- Naples U.
)
,
F. De Marchi
(
- Facolta di Ingegneria, Rome
)
,
R. De Rosa
(
- INFN, Naples and
- Naples U.
)

2017

4 pages

Part of Proceedings, 52nd Rencontres de Moriond on Gravitation (Moriond Gravitation 2017) : La Thuile, Italy, March 25-April 1, 2017, 97-100

Contribution to:

- Moriond Gravitation 2017
, 97-100

Published: 2017

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Abstract: (Grobid)

Torsion pendulums are the best approximation, in the laboratory, to a body in free fall: the extremely low restoring force exerted by the torsion fiber approaches the absence of interaction with the surrounding, but only on a single degree of freedom (DOF), namely the rotation around the fiber. We present a peculiar pendulum where we achieved, by cascading two torsion fibers, almost- free motion on two DOFs: rotation around a vertical axis and translation along one axis. The apparatus was developed to serve as a test facility for LISA Pathfinder(LPF) pre-flight investigations of cross talk between different degrees of freedom, and is presently being upgraded to improve performances and reduce coupling of displacement noise to torsional degrees of freedom. We shall describe the instrument, review the cross-talk measurements performed on it for the electrostatic actuators of LPF and discuss how new experiments can benefit of the peculiarity of two (and potentially more) soft DOFs

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