The status of KAGRA underground cryogenic gravitational wave telescope
T. Akutsu, Masaki Ando, A. Araya, N. Aritomi, Hideki Asada, Y. Aso, S. Atsuta, K. Awai, M. A. Barton, K. C. Cannon, K. Craig, W. Creus, Katsumi Doi, Kazunari Eda, Yutaro Enomoto, R. Flaminio, Yoshinori Fujii, M.-K. Fujimoto, T Furuhata, S. Haino, K. Hasegawa, Katsuya Hashino, K. Hayama, Shigeki Hirobayashi, Eiichi Hirose, Adam H. Hsieh, Yoshiyuki Inoue, Kunihito Ioka, Y. Itoh, T. Kaji, T. Kajita, M. Kakizaki, M. Kamiizumi, Shogo Kambara, Nobuyuki Kanda, Shinya Kanemura, Masato Kaneyama, G. Kang, J Kasuya, Y. Kataoka, N. Kawai, Seiji Kawamura, Chong-Sung Kim, H. Kim, J. Kim, Y. Kim, N. Kimura, Tomoya Kinugawa, S Kirii, Y. Kitaoka, Y. Kojima, K. Kokeyama, K. Komori, Kei Kotake, S. Kumar, Hyung Mok Lee, Hyung Mok Lee, Yongying Liu, N. Luca, E. Majorana, Shuhei Mano, M. Marchio, Toshinori Matsui, Fusakazu Matsushima, Yuta Michimura, O. Miyakawa, Takuya Miyamoto, A. Miyamoto, K. Miyo, S. Miyoki, W. Morii, S. Morisaki, Y. Moriwaki, Tatsuru Morozumi, M. Musha, S. Nagano, K Nagano, K. Nakamura, T. Nakamura, Hiroyuki Nakano, M. Nakano, K.-i. Nakao, T. Narikawa, L. Nguyen Quynh, W.-T. Ni, T. Ochi, J. J. Oh, S. H. Oh, M. Ohashi, N. Ohishi, Masashi Ohkawa, K. Okutomi, K Oohara, F. E.Peña Alleano, I. M. Pinto, Norichika Sago, Motoyuki Saijo, Y. Saito, K Sakai, Yusuke Sakai
Abstract
Abstract KAGRA is a 3-km interferometric gravitational wave telescope located in the Kamioka mine in Japan. It is the first km-class gravitational wave telescope constructed underground to reduce seismic noise, and the first km-class telescope to use cryogenic cooling of test masses to reduce thermal noise. The construction of the infrastructure to house the interferometer in the tunnel, and the initial phase operation of the interferometer with a simple 3-km Michelson configuration have been completed. The first cryogenic operation is expected in 2018, and the observing runs with a full interferometer are expected in 2020s. The basic interferometer configuration and the current status of KAGRA are described.