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Sub-Femto-g free fall for space-based gravitational wave observatories : LISA Pathfinder results

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PhysRevLett.116.231101-1.pdf (656,0Kb)
 
10.1103/PhysRevLett.116.231101
 
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hdl:2117/102419

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Armano, M.
Audley, H.
Auger, G.
Nofrarias Serra, Miquel
Sanjuán Muñoz, Josep
Ramos Castro, Juan JoséMés informacióMés informacióMés informació
Document typeArticle
Defense date2016-06-07
Rights accessOpen Access
Attribution 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution 3.0 Spain
Abstract
We report the first results of the LISA Pathfinder in-flight experiment. The results demonstrate that two free-falling reference test masses, such as those needed for a space-based gravitational wave observatory like LISA, can be put in free fall with a relative acceleration noise with a square root of the power spectral density of 5.2 +/- 0.1 fm s(-2)/root Hz, or (0.54 +/- 0.01) x 10(-15) g/root Hz, with g the standard gravity, for frequencies between 0.7 and 20 mHz. This value is lower than the LISA Pathfinder requirement by more than a factor 5 and within a factor 1.25 of the requirement for the LISA mission, and is compatible with Brownian noise from viscous damping due to the residual gas surrounding the test masses. Above 60 mHz the acceleration noise is dominated by interferometer displacement readout noise at a level of (34.8 +/- 0.3) fm/root Hz, about 2 orders of magnitude better than requirements. At f <= 0.5 mHz we observe a low-frequency tail that stays below 12 fm s(-2)/root Hz down to 0.1 mHz. This performance would allow for a space-based gravitational wave observatory with a sensitivity close to what was originally foreseen for LISA.
CitationArmano, M., Audley, H., Auger, G., Nofrarias Serra, Miquel, Sanjuán, J., Ramos, J. Sub-Femto-g free fall for space-based gravitational wave observatories : LISA Pathfinder results. "Physical review letters", 7 Juny 2016, vol. 116, núm. 23. 
URIhttp://hdl.handle.net/2117/102419
DOI10.1103/PhysRevLett.116.231101
ISSN0031-9007
Publisher versionhttp://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.231101
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