Abstract. The very low specific-force noise specification of the LISA mission requires a drag-free satellite for its realization. Not only is the lowest specific-force noise most likely to be achieved by a completely free-floating proof mass with a wide gap and no applied forces or torques, but the performance of such a system can be assured by prior drag-free satellite experience so that a technology demonstration mission for the drag-free specification would not be needed. Better performance can be achieved if it is possible to present a defined reflecting surface to the laser beam. This paper discusses the techniques of having a defined surface and other issues involved with spherical proof masses.

PACS numbers: 0480N, 9555Y

Print publication: Issue 19 (7 October 2001)
Received 5 July 2001
Published 17 September 2001