Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA
physics.ins-det
/ Authors
Y. Akiyama, T. Akutsu, M. Ando, K. Arai, Y. Arai, S. Araki, A. Araya, N. Aritomi, H. Asada, Y. Aso
and 164 more authors
S. Bae, L. Baiotti, M. A. Barton, K. Cannon, E. Capocasa, C-S. Chen, T-W. Chiu, K. Cho, Y-K. Chu, K. Craig, V. Dattilo, K. Doi, Y. Enomoto, R. Flaminio, Y. Fujii, M. -K. Fujimoto, M. Fukunaga, M. Fukushima, T. Furuhata, S. Haino, K. Hasegawa, Y. Hashimoto, K. Hashino, K. Hayama
/ Abstract
A vibration isolation system called 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.