Use of drag-free spacecraft in the detection of low-frequency gravitational radiation

Details Use of drag-free spacecraft in the detection of low-frequency gravitational radiation Use of drag-free spacecraft in the detection of low-frequency gravitational radiation

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4856....1j&link_type=abstract

Gravitational-Wave Detection. Edited by Cruise, Mike; Saulson, Peter. Proceedings of the SPIE, Volume 4856, pp. 1-8 (2003).

Physics

Scientific paper

The detection of low-frequency gravitational radiation requires a space-borne detector, principally to escape the effects of seismic noise which plague ground-based detectors at low frequencies. Although the seismic disturbance is eliminated, the space environment introduces its own set of problems. For example, solar radiation pressure. This can be shielded by the technique of 'drag-free control', whereby the spacecraft encompassing the test mass provides protection from the external distrubances. A feedback control system ensures that the spacecraft remains 'centered' on the internal mass, while at the same time being physically de-coupled from it. As well as attenuating the external disturbances, the drag-free controls system must minimize the relative motion between the spacecraft and test mass, in order to reduce forces arising from dynamic coupling between the two. Missions like LISA which will perform ultra-precise interferometric measurements require drag-free thruster and sensor technologies with extremely low noise levels. An overveiw of the requirements and the technologies currently being pursued for the LISA drag-free control system is presented.

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