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Paper: Magnetic Back Action Effect of Magnetic Sensors for eLISA/NGO
Volume: 467, 9th LISA Symposium
Page: 341
Authors: Mateos, I.; Diaz-Aguiló, M.; Gibert, F.; Lloro, I.; Lobo, A.; Nofrarias, M.; Ramos-Castro, J.
Abstract: The fluxgate magnetometers used in LISA Pathfinder mission are able to perform very low noise measurements at milli-Hertz frequency, however they need to be kept somehow away from the Test Masses (TMs) due to the quantity of ferromagnetic material contained in the fluxgate's core, which constitutes a potential source of disturbance to the performance. As a result, the estimation of the magnetic field and gradient in the TMs is very problematic, despite the excellent quality of the readout data. The design of a magnetic diagnostic measuring system able to deal with the magnetic constraints for eLISA/NGO will imply the magnetic characterization of the sensors in order to estimate the magnetic back action effect on their environment. The magnetic impact caused by the magnetometers also depends on the noise reduction techniques used in the signal conditioning circuit, which is being studied to develop criteria for the best choice of magnetic sensors for eLISA/NGO.
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