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Type: Journal article
Title: Hydraulic external pre-isolator system for LIGO
Author: Wen, S.
Mittleman, R.
Mason, K.
Giaime, J.
Abbott, R.
Kern, J.
O'Reilly, B.
Bork, R.
Hammond, M.
Hardham, C.
Lantz, B.
Hua, W.
Coyne, D.
Traylor, G.
Overmier, H.
Evans, T.
Hanson, J.
Spjeld, O.
Macinnis, M.
Mailand, K.
et al.
Citation: Classical and Quantum Gravity, 2014; 31(23):235001-1-235001-15
Publisher: IOP Publishing
Issue Date: 2014
ISSN: 0264-9381
Statement of
S Wen, R Mittleman, K Mason, J Giaime, R Abbott, J Kern, B OʼReilly, R Bork, M Hammond, C Hardham, B Lantz, W Hua, D Coyne, G Traylor, H Overmier, T Evans, J Hanson, O Spjeld, M Macinnis, K Mailand, D Ottaway, D Sellers, K Carter and P Sarin
Abstract: The hydraulic external pre-isolator (HEPI) is the first six degrees of freedom active seismic isolation system implemented at the Laser Interferometer Gravitational Wave Observatory (LIGO). Implementation was first completed at the LIGO Livingston Observatory (LLO) prior to LIGOʼs fifth science run7, successfully cutting down the disturbance seen by LLOʼs suspended optics in the two most prominent seismic disturbance bands, the microseism (0.1–0.3 Hz) and the anthropogenic (1–3 Hz) bands, by a factor of a few to tens. The improvement in seismic isolation contributed directly to LLOʼs much improved duty cycle of 66.7% and LIGOʼs triple coincident duty cycle of 53%. We report the design, control scheme, and isolation performance of HEPI at LLO in this paper. Aided by this success, funding for incorporating HEPI into the LIGO Hanford Observatory was approved and installation is currently underway.
Keywords: Gravitational wave detectors and experiments; applied fluid mechanics; structural acoustics and vibration
Rights: © 2014 IOP Publishing Ltd
RMID: 0030033323
DOI: 10.1088/0264-9381/31/23/235001
Appears in Collections:Chemistry and Physics publications

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