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Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA
Akiyama, Y,Akutsu, T,Ando, M,Arai, K,Arai, Y,Araki, S,Araya, A,Aritomi, N,Asada, H,Aso, Y,Bae, S,Baiotti, L,Barton, M A,Cannon, K,Capocasa, E,Chen, C-S,Chiu, T-W,Cho, K,Chu, Y-K,Craig, K,Dattilo, V,Do Institute of Physics 2019 Classical and quantum gravity Vol.36 No.9
<P>A vibration isolation system called the Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics.</P>