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Number of entries: 1

22
November 2019

Magnetic environment and experiments on-board LISA Pathfinder


Start: 12:15h
Speaker: Juan Pedro López Zaragoza
Place: Sala Alberto Lobo (ICE building, Campus UAB)

The differential acceleration measurement between two free-falling test masses on-board LISA Pathfinder is limited in the low frequency regime by force noise applied to the test masses. Several effects can contribute as force noise on the inertial masses and, amongst them, magnetically-induced forces…
Start: 12:15h
Speaker: Juan Pedro López Zaragoza
Place: Sala Alberto Lobo (ICE building, Campus UAB)

The differential acceleration measurement between two free-falling test masses on-board LISA Pathfinder is limited in the low frequency regime by force noise applied to the test masses. Several effects can contribute as force noise on the inertial masses and, amongst them, magnetically-induced forces are precisely one of the effects limiting the performance of the instrument in the milliHertz band. The origin of this disturbance is the coupling of the residual magnetisation and susceptibility of the test masses with the environmental magnetic field. In order to fully understand this term of the noise model, a set of coils and magnetometers are integrated as a part of the LISA Pathfinder diagnostics subsystem.
In this talk we will explain which are the different magnetic experiments we have carried on board LISA Pathfinder in order to extract the magnetic parameters that characterise LISA Pathfinder's test masses. Moreover, we will also give a complete overview of which was the magnetic field on-board the satellite during mission operations and the effects it had on the mission performance. We will finally describe how, by analysing the movement of the test masses during magnetic experiments, we can extract not only information about their magnetic properties, but also about the environment that surrounds them. We also provide the magnetic contribution to the LISA Pathfinder noise budget.
 
Institute of Space Sciences (IEEC-CSIC)

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Email: ice@ice.csic.es
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An institute of the Consejo Superior de Investigaciones Científicas

An institute of the Consejo Superior de Investigaciones Científicas
Affiliated with the Institut d'Estudis Espacials de Catalunya

Affiliated with the Institut d'Estudis Espacials de Catalunya