Achieving geodetic motion for LISA test masses: ground testing result

Details Achieving geodetic motion for LISA test masses: ground testing result Achieving geodetic motion for LISA test masses: ground testing result

2003-07-02

arxiv.org/abs/gr-qc/0307008v2

Phys.Rev.Lett. 91 (2003) 151101; Erratum-ibid. 91 (2003) 179903

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages (revtex4) with 4 figures

Scientific paper

10.1103/PhysRevLett.91.151101

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 fNm/sqrt{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 mV level.

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