Precision measurements of the magnetic parameters of LISA Pathfinder test masses

Abstract

A precise characterization of the magnetic properties of LISA Pathfinder free falling test-masses is of special interest for future gravitational wave observatory in space. Magnetic forces have an important impact on the instrument sensitivity in the low frequency regime below the millihertz. In this paper we report on the magnetic injection experiments performed throughout LISA Pathfinder operations. We show how these experiments allowed a high precision estimate of the instrument magnetic parameters. The remanent magnetic moment was found to have a modulus of $(0.245\pm 0.081){\mathrm{nAm}}^2$, the x-component of the background magnetic field within the test masses position was measured to be $(414\pm 74)$ nT and its gradient had a value of $(-7.4\pm 2.1)\mu$T/m. Finally, we also measured the test mass magnetic susceptibility to be $(-3.35\pm 0.15)\times$10${}^{-5}$ in the low frequency regime. All results are in agreement with on-ground estimates.

References in corpus (5)

• Temperature stability in the sub-milliHertz band with LISA Pathfinder
• Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder
• The LISA PathFinder DMU and Radiation Monitor
• The diagnostics subsystem on board LISA PathFinder and LISA
• Magnetic-induced force noise in LISA Pathfinder free-falling test masses

Cited by in corpus (3)

• Magnetic-induced force noise in LISA Pathfinder free-falling test masses
• Accelerating the time-domain LISA response model with central finite differences and hybridization techniques
• Antenna for the detection of electromagnetic audio-band disturbances on-board LISA