2014/07/23 by Fabrice Matichard, F. Matichard, Matichard, Fabrice +103 · 4 citations
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #FOS: Physical sciences #Geophysics and Gravity Measurements #Geophysics and Sensor Technology #Instrumentation and Detectors (physics.ins-det) #Magnetic Bearings and Levitation Dynamics #Magnetic confinement fusion research #Pulsars and Gravitational Waves Research #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1407.6377
arxiv created 2014/07/23 · openalex publication_date 2014/07/23 · arxiv updated 2014/07/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
New generations of gravity wave detectors require unprecedented levels of vibration isolation. This paper presents the final design of the vibration isolation and positioning platform used in Advanced LIGO to support the interferometers core optics. This five-ton two-and-half-meter wide system operates in ultra-high vacuum. It features two stages of isolation mounted in series. The stages are imbricated to reduce the overall height. Each stage provides isolation in all directions of translation and rotation. The system is instrumented with a unique combination of low noise relative and inertial sensors. The active control provides isolation from 0.1 Hz to 30 Hz. It brings the platform motion down to 10^(-11) m/Hz^(0.5) at 1 Hz. Active and passive isolation combine to bring the platform motion below 10^(-12) m/Hz^(0.5) at 10 Hz. The passive isolation lowers the motion below 10^(-13) m/Hz^(0.5) at 100 Hz. The paper describes how the platform has been engineered not only to meet the isolation requirements, but also to permit the construction, testing, and commissioning process of the fifteen units needed for Advanced LIGO observatories.