Preliminary results on the suppression of sensing cross-talk in LISA Pathfinder

11th International LISA Symposium

Wanner, Gudrun^1 ; Karnesis, Nikolaos^1

Max Planck Institute for Gravitational Physics, Albert Einstein Institute, Institute for Gravitational Physics, Leibniz Universitt Hannover, Germany^1

关键词: Cross-couplings;    Crosstalk noise;    LISA Pathfinder;    Noise suppression;    Preliminary analysis;    Spacecraft motion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/840/1/012043/pdf
DOI  :  10.1088/1742-6596/840/1/012043

来源: IOP

【 摘 要 】

In the original paper describing the first measurements performed with LISA Pathfinder, a bulge in the acceleration noise was shown in the 200 mHz - 20 mHz frequency band. This bulge noise originated from cross-coupling of spacecraft motion into the longitudinal readout and it was shown that it is possible to subtract this cross-talk noise. We discuss here the model that was used for subtraction as well as an alternative approach to suppress the cross talk by realignment of the test masses. Such a realignment was performed after preliminary analysis of a dedicated cross-talk experiment, and we show the resulting noise suppression. Since then, further experiments have been performed to investigate the cross-coupling behaviour, however analysis of these experiments is still on-going.