http://arxiv.org/abs/1801.01468
We present a novel inertial-isolation scheme based on six degree-of-freedom (6D) interferometric readout of a single reference mass. It is capable of reducing inertial motion by more than two orders of magnitude at 100\,mHz compared with what is achievable with state-of-the-art seismometers. This would in turn dramatically improve the low-frequency sensitivity of gravitational-wave detectors. The scheme is inherently two-stage, the reference mass is softly suspended within the platform to be isolated, which is itself suspended from the ground. The platform is held constant relative to the reference mass and this closed-loop control effectively transfers the low force-noise of the reference mass to the platform. The loop gain also reduces non-linear couplings and dynamic range requirements in the soft-suspension mechanics and the interferometric readout.
C. Mow-Lowry and D. Martynov
Mon, 8 Jan 18
38/117
Comments: N/A