Achieving Geodetic Motion for LISA Test Masses: Ground Testing Results

Ludovico Carbone, A Cavalleri, R Dolesi, CD Hoyle, M Hueller, S Vitale, WJ Weber

Research output: Contribution to journalArticle


The low-frequency resolution of space-based gravitational wave observatories such as LISA (Laser Interferometry Space Antenna) hinges on the orbital purity of a free-falling reference test mass inside a satellite shield. We present here a torsion pendulum study of the forces that will disturb an orbiting test mass inside a LISA capacitive position sensor. The pendulum, with a measured torque noise floor below 10 fN m/square root of Hz from 0.6 to 10 mHz, has allowed placement of an upper limit on sensor force noise contributions, measurement of the sensor electrostatic stiffness at the 5% level, and detection and compensation of stray dc electrostatic biases at the millivolt level.
Original languageEnglish
Article number151101
JournalPhysical Review Letters
Issue number15
Early online date1 Oct 2003
Publication statusPublished - 1 Oct 2003


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