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Seismic isolation enhancements for initial and Advanced LIGO

R Abbott et al 2004 Class. Quantum Grav. 21 S915-S921   doi: 10.1088/0264-9381/21/5/081  Help

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R Abbott1, R Adhikari2, G Allen3, D Baglino3, C Campbell3, D Coyne1, E Daw4, D DeBra5, J Faludi3, P Fritschel2, A Ganguli3, J Giaime4, M Hammond6, C Hardham3, G Harry2, W Hua3, L Jones1, J Kern6, B Lantz3, K Lilienkamp2, K Mailand1, K Mason2, R Mittleman2, S Nayfeh2, D Ottaway2, J Phinney2, W Rankin2, N Robertson3, R Scheffler3, D H Shoemaker2, S Wen4, M Zucker6 and L Zuo2
1 LIGO Laboratory, MS 18-34, California Institute of Technology, Pasadena, CA 91125, USA
2 LIGO Laboratory, Bldg. NW17-161, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
3 Ginzton Laboratory, Stanford University, Stanford, CA 94305, USA
4 Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA
5 Department of Aeronautics and Astronautics, Stanford University, Stanford, CA 94305, USA
6 LIGO Livingston Observatory, Box 940, Livingston, LA 70754, USA
E-mail: giaime@phys.lsu.edu

Abstract. A seismic isolation system for the proposed 'Advanced LIGO' detector upgrade is under development. It consists of a two-stage in-vacuum active isolation platform that is supported by an external hydraulic actuation stage. A full-scale preliminary-design technology demonstrator of the in-vacuum platform has been assembled and is being tested at Stanford's engineering test facility. Unanticipated excess ground motion from local human activity at LIGO Livingston has prompted accelerated development of the external stage for installation and use in the initial Livingston detector. As an interim measure, active external isolation in the laser beam direction is implemented using existing PZT external actuators.

PACS numbers: 04.80.Nn, 07.05.Dz, 07.07.Tw, 07.10.Fq

Print publication: Issue 5 (7 March 2004)
Received 3 October 2003
Published 11 February 2004

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