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New generations of gravity wave detectors require unprecedented levels ofvibration isolation. This paper presents the final design of the vibrationisolation and positioning platform used in Advanced LIGO to support theinterferometers core optics. This five-ton two-and-half-meter wide systemoperates in ultra-high vacuum. It features two stages of isolation mounted inseries. The stages are imbricated to reduce the overall height. Each stageprovides isolation in all directions of translation and rotation. The system isinstrumented with a unique combination of low noise relative and inertialsensors. The active control provides isolation from 0.1 Hz to 30 Hz. It bringsthe platform motion down to 10^(-11) m/Hz^(0.5) at 1 Hz. Active and passiveisolation combine to bring the platform motion below 10^(-12) m/Hz^(0.5) at 10Hz. The passive isolation lowers the motion below 10^(-13) m/Hz^(0.5) at 100Hz. The paper describes how the platform has been engineered not only to meetthe isolation requirements, but also to permit the construction, testing, andcommissioning process of the fifteen units needed for Advanced LIGOobservatories.

Advanced LIGO Two-Stage Twelve-Axis Vibration Isolation and Positioning Platform. Part 1: Design and Production Overview