CaltechAUTHORS
Published December 7, 2014 | Version Submitted
Journal Article Open

Hydraulic external pre-isolator system for LIGO

Creators

  • 1. ROR icon Laser Interferometer Gravitational Wave Observatory
  • 2. ROR icon Louisiana State University
  • 3. ROR icon Massachusetts Institute of Technology
  • 4. ROR icon California Institute of Technology
  • 5. ROR icon Stanford University

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 LIGO's fifth science run, successfully cutting down the disturbance seen by LLO's 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 LLO's much improved duty cycle of 66.7% and LIGO's 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.

Additional Information

© 2014 IOP Publishing Ltd. Received 30 April 2014, revised 14 August 2014. Accepted for publication 26 August 2014. Published 13 November 2014. The authors acknowledge financial support from the National Science Foundation through grants PHY-0071316, 0107417, 0140297, 0304924, and 9801158, as well as the Louisiana Board of Regents contract LEQSF(2000–03)-RD-A-06.

Attached Files

Submitted - 1309.5685v1.pdf

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1309.5685v1.pdf

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Additional details

Identifiers

Eprint ID
53203
Resolver ID
CaltechAUTHORS:20150106-100448346

Related works

Describes
http://arxiv.org/abs/1309.5685v1 (URL)

Funding

NSF
PHY-0071316
NSF
PHY-0107417
NSF
PHY-0140297
NSF
PHY-0304924
NSF
PHY-9801158
Louisiana Board of Regents
LEQSF(2000–03)-RD-A-06

Dates

Created
2015-01-06
Created from EPrint's datestamp field
Updated
2022-07-12
Created from EPrint's last_modified field