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Published March 18, 2021 | Published
Journal Article Open

Vibration isolation systems for the beam splitter and signal recycling mirrors of the KAGRA gravitational wave detector

Akutsu, T. ORCID icon
Ando, M.
Arai, K.
Arai, Y.
Araki, S.
Araya, A. ORCID icon
Aritomi, N.
Asada, H.
Aso, Y. ORCID icon
Bae, S.
Bae, Y. ORCID icon
Baiotti, L.
Bajpai, R.
Barton, M. A. ORCID icon
Cannon, K.
Cao, Z.
Capocasa, E.
Chan, M.
Chen, C.
Chen, K.
Chen, Y.
Chiang, C-Y.
Chu, H.
Chu, Y-K.
Eguchi, S.
Enomoto, Y. ORCID icon
Flaminio, R.
Fujii, Y.
Fujikawa, Y.
Fukunaga, M.
Fukushima, M.
Gao, D.
Ge, G.
Ha, S.
Hagiwara, A.
Haino, S.
Han, W-B.
Hasegawa, K.
Hatoya, R.
Hattori, K.
Hayakawa, H.
Hayama, K.
Himemoto, Y.
Hiranuma, Y.
Hirata, N.
Hirose, E.
Hong, Z.
Hsieh, B.
Huang, G-Z.
Huang, H-Y.
Huang, P.
Huang, Y-C.
Huang, Y.
Hui, D. C. Y.
Ide, S.
Ikenoue, B.
Imam, S.
Inayoshi, K. ORCID icon
Inoue, Y.
Ioka, K.
Ito, K.
Itoh, Y.
Izumi, K.
Jeon, C.
Jin, H-B.
Jung, K.
Jung, P.
Kaihotsu, K.
Kajita, T.
Kakizaki, M.
Kamiizumi, M.
Kanda, N. ORCID icon
Kang, G
Kawaguchi, K.
Kawai, N.
Kawasaki, T.
Kim, C. ORCID icon
Kim, J.
Kim, J. C.
Kim, W. S.
Kim, Y-M.
Kimura, N.
Kita, N.
Kitazawa, H.
Kojima, Y.
Kokeyama, K.
Komori, K.
Kong, A. K. H. ORCID icon
Kotake, K.
Kozakai, C.
Kozu, R.
Kumar, R.
Kume, J.
Kuo, C.
Kuo, H-S.
Kuromiya, Y.
Kuroyanagi, S.
Kusayanagi, K.
Kwak, K.
Lee, H. K.
Lee, H. W. ORCID icon
Lee, R. ORCID icon
Leonardi, M.
Li, K. L.
Lin, L. C-C. ORCID icon
Lin, C-Y. ORCID icon
Lin, F-K.
Lin, F-L.
Lin, H. L.
Liu, G. C.
Luo, L-W.
Majorana, E.
Marchio, M.
Michimura, Y. ORCID icon
Mio, N.
Miyakawa, O.
Miyamoto, A.
Miyazaki, Y.
Miyo, K. ORCID icon
Miyoki, S.
Mori, Y.
Morisaki, S.
Moriwaki, Y.
Nagano, K.
Nagano, S.
Nakamura, K. ORCID icon
Nakano, H. ORCID icon
Nakano, M.
Nakashima, R.
Nakayama, Y.
Narikawa, T.
Naticchioni, L.
Negishi, R.
Nguyen Quynh, L. ORCID icon
Ni, W-T. ORCID icon
Nishizawa, A.
Nozaki, S.
Obuchi, Y.
Ogaki, W.
Oh, J. J. ORCID icon
Oh, K.
Oh, S. H.
Ohashi, M.
Ohishi, N.
Ohkawa, M.
Ohta, H.
Okutani, Y.
Okutomi, K.
Oohara, K.
Ooi, C.
Oshino, S.
Otabe, S.
Pan, K.
Pang, H.
Parisi, A.
Park, J. ORCID icon
Peña Arellano, F. E. ORCID icon
Pinto, I.
Sago, N.
Saito, S.
Saito, Y.
Sakai, K.
Sakai, Y.
Sakuno, Y.
Sato, S.
Sato, T.
Sawada, T.
Sekiguchi, T.
Sekiguchi, Y.
Shao, L.
Shibagaki, S.
Shimizu, R.
Shimoda, T.
Shimode, K.
Shinkai, H. ORCID icon
Shishido, T.
Shoda, A. ORCID icon
Somiya, K.
Son, E. J. ORCID icon
Sotani, H.
Sugimoto, R.
Suresh, J.
Suzuki, T.
Suzuki, T.
Tagoshi, H.
Takahashi, H.
Takahashi, R. ORCID icon
Takamori, A.
Takano, S.
Takeda, H.
Takeda, M.
Tanaka, H.
Tanaka, K.
Tanaka, K.
Tanaka, T.
Tanaka, T.
Tanioka, S. ORCID icon
Tapia San Martin, E. N.
Telada, S.
Tomaru, T.
Tomigami, Y.
Tomura, T.
Travasso, F. ORCID icon
Trozzo, L.
Tsang, T.
Tsao, J-S.
Tsubono, K.
Tsuchida, S.
Tsutsui, T.
Tsuzuki, T.
Tuyenbayev, D.
Uchikata, N.
Uchiyama, T.
Ueda, A.
Uehara, T. ORCID icon
Ueno, K.
Ueshima, G.
Uraguchi, F.
Ushiba, T. ORCID icon
van Putten, M. H. P. M.
Vocca, H. ORCID icon
Wang, J.
Washimi, T. ORCID icon
Wu, C.
Wu, H.
Wu, S.
Xu, W-R.
Yamada, T.
Yamamoto, K. ORCID icon
Yamamoto, K.
Yamamoto, T. ORCID icon
Yamashita, K.
Yamazaki, R.
Yang, Y.
Yokogawa, K.
Yokoyama, J.
Yokozawa, T.
Yoshioka, T.
Yuzurihara, H.
Zeidler, S.
Zhan, M.
Zhang, H.
Zhao, Y.
Zhu, Z-H. ORCID icon


KAGRA is an underground interferometric gravitational wave detector which is currently being commissioned. This detector relies on high-performance vibration-isolation systems to suspend its key optical components. These suspensions come in four different configurations, of which the type-B is used for the beam splitter and signal recycling mirrors. The type-B suspension comprises the payload, three geometric anti-spring filters for vertical isolation and one inverted pendulum for horizontal isolation. The payload comprises the optic, its marionette and their recoil masses, which hold local displacement sensors and coil magnet actuators used for damping the resonant modes of oscillation of the suspension itself. The beam splitter version has a modified lower section to accommodate a wider optical component. The payload is also equipped with an optical lever, used to monitor and control the position of the suspended optics from the ground. All four suspensions have now been installed in vacuum chambers. We describe the mechanical, electrical and control design, and the measured performance compared to requirements.

Additional Information

© 2021 IOP Publishing Ltd. Received 23 September 2020; Revised 29 November 2020; Accepted 6 January 2021; Published 5 March 2021. We appreciate the contributions from Takanori Sekiguchi, Riccardo DeSalvo, Gianni Gennaro and Joris van Heijningen during the prototype development. This work was supported by MEXT, JSPS Leading-edge Research Infrastructure Program, JSPS Grant-in-Aid for Specially Promoted Research 26000005, JSPS Grant-in-Aid for Scientific Research on Innovative Areas 2905: JP17H06358, JP17H06361 and JP17H06364, JSPS Core-to-Core Program A. Advanced Research Networks, JSPS Grant-in-Aid for Scientific Research (S) 17H06133, the joint research program of the Institute for Cosmic Ray Research, University of Tokyo, National Research Foundation (NRF) and Computing Infrastructure Project of KISTI-GSDC in Korea, Academia Sinica (AS), AS Grid Center (ASGC) and the Ministry of Science and Technology (MoST) in Taiwan under grants including AS-CDA-105-M06, Advanced Technology Center (ATC) of NAOJ, Mechanical Engineering Center of KEK, the LIGO project, and the Virgo project.

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August 20, 2023
October 23, 2023