LIGO Document T080194-v1

Dynamic Vibration Absorber

Document #:
Document type:
T - Technical notes
Other Versions:
13 Mar 2009, 08:01
One approach to mitigating or eliminating the risk of parametric instability, due to the coupling
of optical and acoustic modes in the Advanced LIGO Fabry-Perot arm cavities, is to add
passive damping to the acoustic modes by the addition of one or more passive dynamic
dampers. In this technical memo we define the dynamics of the coupled test mass and
absorber dynamics.

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