Upper limits to surface-force disturbances on LISA proof masses and the possibility of observing galactic binaries
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology2007Vol. 75(4)
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Ludovico Carbone, G. Ciani, R. Dolesi, M. Hueller, D Tombolato, S. Vitale, W. J. Weber, A. Cavalleri
Abstract
We have measured surface-force noise on a hollow replica of a LISA proof mass surrounded by its capacitive motion sensor. Forces are detected through the torque exerted on the proof mass by means of a torsion pendulum in the 0.1--30 mHz range. The sensor and electronics have the same design as for the flight hardware, including 4 mm gaps around the proof mass. The measured upper limit for forces would allow detection of a number of galactic binaries signals with signal-to-noise ratio up to $\ensuremath{\approx}40$ for 1 yr integration. We also discuss how LISA Pathfinder will substantially improve this limit, approaching the LISA performance.
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