LIGO Document G0900578-v1

Control of AIGO High Performance Vibration Isolation System in an 80 m Fabry-Perot Cavity

Document #:
LIGO-G0900578-v1
Document type:
G - Presentations (eg Graphics)
Abstract:
Two high performance passive vibration isolation systems are used in an 80m optical cavity at ACIGA’s Gingin high optical power facility. . We present the control and performance of the vibration isolation system. Optical lever were used to c achieving low angular noise. Initial run with high damping of inverse pendulum has residual motion performance at nanometre level (~3 nm per test mass). Improved feedback scheme using differential motion of the inverse pendulum and Roberts linkage stage allows orders of magnitude improvement.
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