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Published March 2017 | Published
Journal Article Open

Design of a tuned mass damper for high quality factor suspension modes in Advanced LIGO


We discuss the requirements, design, and performance of a tuned mass damper which we have developed to damp the highest frequency pendulum modes of the quadruple suspensions which support the test masses in the two advanced detectors of the Laser Interferometric Gravitational-Wave Observatory. The design has to meet the requirements on mass, size, and level of damping to avoid unduly compromising the suspension thermal noise performance and to allow retrofitting of the dampers to the suspensions with minimal changes to the existing suspensions. We have produced a design satisfying our requirements which can reduce the quality factor of these modes from ∼500 000 to less than 10 000, reducing the time taken for the modes to damp down from several hours to a few minutes or less.

Additional Information

© 2017 AIP Publishing LLC. Received 10 January 2017; accepted 4 March 2017; published online 30 March 2017. We wish to thank colleagues in the LIGO Scientific Collaboration for their support and interest in this work. We thank our colleagues at the LIGO Livingston Observatory for taking data on the BRD performance in situ. We also acknowledge the following colleagues for input on various aspects of the design and implementation of the BRDs: Ben Abbott, Rich Abbott, Stuart Aston, Dennis Coyne, Brian Lantz, Travis Sadecki, Eddie Sanchez, Evan Sloan, Bob Taylor, Gary Traylor, and Betsy Weaver. We acknowledge the support provided by the National Science Foundation for this work. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation and operates under Cooperative Agreement No. PHY-0757058. Advanced LIGO was built under Award No. PHY-0823459. The work at Stanford University is supported by Cooperative Agreement No. PHY-1404430. This paper has LIGO document No. P1600328.

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