Control and Performance of the Hydraulic External Pre-Isolator at LASTI

Document #:

LIGO-T030077-v1

Document type:

T - Technical notes

Abstract:

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.

Files in Document:

• Control and Performance of HEPI T030077.pdf (545.9 kB)
• Control and Performance of HEPI.doc (981.5 kB)

Topics:

• Basic R&D
• Seismic Isolation

Authors:

• Brian Lantz
• Corwin Hardham

Keywords:

HEPI SEI LASTI EPI review

Notes and Changes:

Describes the testing of the HEPI unit in LASTI, for the EPI review of April 2003

Referenced by:

• LIGO-M2000231: Documents for the External Pre-Isolator (EPI) review of April 2003