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Proceedings Paper

Seismic isolation and suspension systems for Advanced LIGO
Author(s): Norna A. Robertson; Benjamin Abbott; R. Abbott; R. Adhikari; Graham S. Allen; Helena Armandula; Stuart Mark Aston; A. Baglino; Mark Barton; B. Bland; Rolf Bork; J. Bogenstahl; Gianpietro Cagnoli; C. Campbell; C. A. Cantley; K. Carter; D. Cook; D. Coyne; David R.M. Crooks; Edward J. Daw; Daniel B. DeBra; E. Elliffe; J. Faludi; Peter Fritschel; A. Ganguli; Joseph A. Giaime; S. Gossler; A. Grant; J. Greenhalgh; M. Hammond; Jonathan Hanson; C. Hardham; Gregory M. Harry; Alistair Heptonstall; Jay Heefner; James Hough; D. Hoyland; Wensheng Hua; L. Jones; R. Jones; Jonathan E. Kern; J. LaCour; Brian T. Lantz; K. Lilienkamp; N. Lockerbie; Harald Lueck; M. MacInnis; K. Mailand; Ken Mason; R. Mittleman; Samir A. Nayfeh; J. Nichol; David J. Ottaway; H. Overmier; M. Perreur-Lloyd; J. Phinney; M. V. Plissi; W. Rankin; D. I. Robertson; J. Romie; Sheila Rowan; R. Scheffler; David H. Shoemaker; P. Sarin; Peter H. Sneddon; Clive C. Speake; O. Spjeld; G. Stapfer; Kenneth A. Strain; C. I. Torrie; G. Traylor; J. van Niekerk; Alberto Vecchio; Shirong Wen; P. Willems; I. Wilmut; Harry Ward; M. Zucker; Lei Zuo
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Paper Abstract

To meet the overall isolation and alignment requirements for the optics in Advanced LIGO, the planned upgrade to LIGO, the US laser interferometric gravitational wave observatory, we are developing three sub-systems: a hydraulic external pre-isolator for low frequency alignment and control, a two-stage active isolation platform designed to give a factor of ~1000 attenuation at 10 Hz, and a multiple pendulum suspension system that provides passive isolation above a few hertz. The hydraulic stage uses laminar-flow quiet hydraulic actuators with millimeter range, and provides isolation and alignment for the optics payload below 10 Hz, including correction for measured Earth tides and the microseism. This stage supports the in-vacuum two-stage active isolation platform, which reduces vibration using force feedback from inertial sensor signals in six degrees of freedom. The platform provides a quiet, controlled structure to mount the suspension system. This latter system has been developed from the triple pendulum suspension used in GEO 600, the German/UK gravitational wave detector. To meet the more stringent noise levels required in Advanced LIGO, the baseline design for the most sensitive optics calls for a quadruple pendulum, whose final stage consists of a 40 kg sapphire mirror suspended on fused silica ribbons to reduce suspension thermal noise.

Paper Details

Date Published: 29 September 2004
PDF: 11 pages
Proc. SPIE 5500, Gravitational Wave and Particle Astrophysics Detectors, (29 September 2004); doi: 10.1117/12.552469
Show Author Affiliations
Norna A. Robertson, Stanford Univ. (United States)
Univ. of Glasgow (United Kingdom)
Benjamin Abbott, LIGO Lab./California Institute of Technology (United States)
R. Abbott, LIGO Livingston Observatory (United States)
R. Adhikari, LIGO Lab./Massachussetts Institute of Technology (United States)
Graham S. Allen, Stanford Univ. (United States)
Helena Armandula, LIGO Lab./California Institute of Technology (United States)
Stuart Mark Aston, Univ. of Birmingham (United Kingdom)
A. Baglino, Stanford Univ. (United States)
Mark Barton, LIGO Lab./California Institute of Technology (United States)
B. Bland, LIGO Hanford Observatory (United States)
Rolf Bork, LIGO Lab./California Institute of Technology (United States)
J. Bogenstahl, Univ. Hannover (Germany)
Univ. of Glasgow (United Kingdom)
Gianpietro Cagnoli, Univ. of Glasgow (United Kingdom)
C. Campbell, Stanford Univ. (United States)
C. A. Cantley, Univ. of Glasgow (United Kingdom)
K. Carter, LIGO Livingston Observatory (United States)
D. Cook, LIGO Hanford Observatory (United States)
D. Coyne, LIGO Lab./California Institute of Technology (United States)
David R.M. Crooks, Univ. of Glasgow (United Kingdom)
Edward J. Daw, Louisiana State Univ. (United States)
Daniel B. DeBra, Stanford Univ. (United States)
E. Elliffe, Univ. of Glasgow (United Kingdom)
J. Faludi, Stanford Univ. (United States)
Peter Fritschel, LIGO Lab./Massachusetts Institute of Technology (United States)
A. Ganguli, Stanford Univ. (United States)
Joseph A. Giaime, Louisiana State Univ. (United States)
LIGO Livingston Observatory (United States)
S. Gossler, Univ. Hannover (Germany)
A. Grant, Univ. of Glasgow (United Kingdom)
J. Greenhalgh, Rutherford Appleton Lab. (United Kingdom)
M. Hammond, LIGO Livingston Observatory (United States)
Jonathan Hanson, LIGO Livingston Observatory (United States)
C. Hardham, Stanford Univ. (United States)
Gregory M. Harry, LIGO Lab./Massachusetts Institute of Technology (United States)
Alistair Heptonstall, Univ. of Glasgow (United Kingdom)
Jay Heefner, LIGO Lab./California Institute of Technology (United States)
James Hough, Univ. of Glasgow (United Kingdom)
D. Hoyland, Univ. of Birmingham (United Kingdom)
Wensheng Hua, Stanford Univ. (United States)
L. Jones, LIGO Lab./California Institute of Technology (United States)
R. Jones, Univ. of Glasgow (United Kingdom)
Jonathan E. Kern, LIGO Livingston Observatory (United States)
J. LaCour, LIGO Livingston Observatory (United States)
Brian T. Lantz, Stanford Univ. (United States)
K. Lilienkamp, LIGO Lab./Massachusetts Institute of Technology (United States)
N. Lockerbie, Univ. of Strathclyde (United Kingdom)
Harald Lueck, Univ. Hannover (Germany)
M. MacInnis, LIGO Lab./Massachusetts Institute of Technology (United States)
K. Mailand, LIGO Lab./California Institute of Technology (United States)
Ken Mason, LIGO Lab./Massachusetts Institute of Technology (United States)
R. Mittleman, LIGO Lab./Massachusetts Institute of Technology (United States)
Samir A. Nayfeh, LIGO Lab./Massachusetts Institute of Technology (United States)
J. Nichol, Stanford Univ. (United States)
David J. Ottaway, LIGO Lab./Massachusetts Institute of Technology (United States)
H. Overmier, LIGO Livingston Observatory (United States)
M. Perreur-Lloyd, Univ. of Glasgow (United Kingdom)
J. Phinney, LIGO Lab./Massachusetts Institute of Technology (United States)
M. V. Plissi, Univ. of Glasgow (United Kingdom)
W. Rankin, LIGO Lab./Massachusetts Institute of Technology (United States)
D. I. Robertson, Univ. of Glasgow (United Kingdom)
J. Romie, LIGO Lab./California Institute of Technology (United States)
Sheila Rowan, Univ. of Glasgow (United Kingdom)
R. Scheffler, Stanford Univ. (United States)
David H. Shoemaker, LIGO Lab./Massachusetts Institute of Technology (United States)
P. Sarin, LIGO Lab./Massachusetts Institute of Technology (United States)
Peter H. Sneddon, Univ. of Glasgow (United Kingdom)
Clive C. Speake, Univ. of Birmingham (United Kingdom)
O. Spjeld, LIGO Livingston Observatory (United States)
G. Stapfer, LIGO Livingston Observatory (United States)
Kenneth A. Strain, Univ. of Glasgow (United Kingdom)
C. I. Torrie, LIGO Lab./California Institute of Technology (United States)
G. Traylor, LIGO Livingston Observatory (United States)
J. van Niekerk, Stanford Univ. (United States)
Alberto Vecchio, Univ. of Birmingham (United Kingdom)
Shirong Wen, Louisiana State Univ. (United States)
P. Willems, LIGO Lab./California Institute of Technology (United States)
I. Wilmut, Rutherford Appleton Lab. (United Kingdom)
Harry Ward, Univ. of Glasgow (United Kingdom)
M. Zucker, LIGO Livingston Observatory (United States)
Lei Zuo, LIGO Lab./Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 5500:
Gravitational Wave and Particle Astrophysics Detectors
James Hough; Gary H. Sanders, Editor(s)

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