Bassan, M.M.BassanCavalleri, A.A.CavalleriDe Laurentis, M.M.De LaurentisDe Marchi, F.F.De MarchiDe Rosa, R.R.De RosaDi Fiore, L.L.Di FioreDolesi, R.R.DolesiFinetti, N.N.FinettiGarufi, F.F.GarufiGRADO, ANIELLOANIELLOGRADOHueller, M.M.HuellerMarconi, L.L.MarconiMilano, L.L.MilanoPucacco, G.G.PucaccoStanga, R.R.StangaVISCO, MassimoMassimoVISCOVitale, S.S.VitaleWeber, W. J.W. J.Weber2020-07-162020-07-1620160031-9007http://hdl.handle.net/20.500.12386/26462A torsion pendulum with 2 soft degrees of freedom (DOFs), realized by off-axis cascading two torsion fibers, has been built and operated. This instrument helps characterize the geodesic motion of a test mass for LISA Pathfinder or any other free-fall space mission, providing information on cross talk and other effects that cannot be detected when monitoring a single DOF. We show that it is possible to simultaneously measure both the residual force and the residual torque acting on a quasifree test mass. As an example of the investigations that a double pendulum allows, we report the measurement of the force-to-torque cross talk, i.e., the amount of actuation signal, produced by applying a force on the suspended test mass, that leaks into the rotational DOF, detected by measuring the corresponding (unwanted) torque.STAMPAenArticle10.1103/PhysRevLett.116.0511042-s2.0-84957824354000369495000002https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.0511042016PhRvL.116e1104BFIS/01 - FISICA SPERIMENTALE