LIGO Document T030077-v1
- A full scale version of the Hydraulic External Pre-Isolator (HEPI) has been installed in a BSC chamber LASTI, the LIGO test facility at MIT. HEPI is a 6 Degree-of-freedom alignment and seismic isolation system which is being developed and tested for possible deployment to the LIGO Livingston Observatory (LLO). This document describes the mechanics of the hydraulic isolation system, the location and coordination of the sensors and actuators, the control topology, and the performance we have achieved to date.
- Describes the testing of the HEPI unit in LASTI, for the EPI review of April 2003
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