Characterization of disturbance sources for LISA: torsion pendulum results

Details Characterization of disturbance sources for LISA: torsion pendulum results Characterization of disturbance sources for LISA: torsion pendulum results

2004-12-21

arxiv.org/abs/gr-qc/0412103v1

Class.Quant.Grav. 22 (2005) S509-S520

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages, 8 figures, accepted for publication Classical and Quantum Gravity

Scientific paper

10.1088/0264-9381/22/10/051

A torsion pendulum allows ground-based investigation of the purity of free-fall for the LISA test masses inside their capacitive position sensor. This paper presents recent improvements in our torsion pendulum facility that have both increased the pendulum sensitivity and allowed detailed characterization of several important sources of acceleration noise for the LISA test masses. We discuss here an improved upper limit on random force noise originating in the sensor. Additionally, we present new measurement techniques and preliminary results for characterizing the forces caused by the sensor's residual electrostatic fields, dielectric losses, residual spring-like coupling, and temperature gradients.

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