What happens if the test masses rotate?
The masses will spin slowly at an initially undetermined rate after uncaging. They will spin about the center of their inner bore, rather than the center of mass, because of the slow rotation and stiffness of the bearings. There are several areas of concern. 1. The ends of the masses may not be exactly perpendicular to the rotation axis. This could cause an apparent position shift of the mass as a function of the angle of rotation, proportional to the offset of the spin axis from the axis of the SQUID position sensors and the difference from perpendicularity. The apparent shift would be at the frequency of rotation of the mass (and its harmonics). 2. The ends of the masses may not be parallel to each other. This does not cause an apparent position shift of the mass, but causes a change in sensitivity proportional to the offset of the spin axis from the axis of the SQUID sensors and the difference in angle of the ends. If the mass is not exactly centered this would in turn cause an appa
