The Current Status and Future Prospects of KAGRA, the Large-Scale Cryogenic Gravitational Wave Telescope Built in the Kamioka Underground
H. Abe, T. Akutsu, Masaki Ando, A. Araya, N. Aritomi, Hideki Asada, Y. Aso, Sang-Wook Bae, R. Bajpai, K. C. Cannon, Zhoujian Cao, E. Capocasa, M. Chan, D. Chen, Yi-Ru Chen, M. Eisenmann, R. Flaminio, Heather Fong, Yuta Fujikawa, Y. Fujimoto, I. P. W. Hadiputrawan, S. Haino, Wen-Biao Han, K. Hayama, Y. Himemoto, N. Hirata, Chiaki Hirose, Tsung-Chieh Ho, Bin-Hua Hsieh, H-F. Hsieh, C Hsiung, Hsiang-Yu Huang, Panwei Huang, Y-C. Huang, Yun-Jing Huang, David Hui, Kohei Inayoshi, Yuki Inoue, Y. Itoh, P. Jung, T. Kajita, Masahiro Kamiizumi, Nobuyuki Kanda, Takashi Kato, Chunglee Kim, Jaewan Kim, Y.-M. Kim, Y. Kobayashi, Kazunori Kohri, K. Kokeyama, A. K. H. Kong, Naoki Koyama, Chihiro Kozakai, J. Kume, Sachiko Kuroyanagi, K. Kwak, Eunsub Lee, Hyung Lee, Ray‐Kuang Lee, M. Leonardi, Kwan-Lok Li, Pengbo Li, L. C.-C. Lin, Chun-Yu Lin, En-Tzu Lin, Hong‐Lin Lin, Guo-Chin Liu, L.-W. Luo, M. Ma’arif, Yuta Michimura, Norikatsu Mio, O. Miyakawa, K. Miyo, S. Miyoki, N. Morisue, K. Nakamura, Hiroyuki Nakano, Masayuki Nakano, Tatsuya Narikawa, Lan Quynh, T. Nishimoto, A. Nishizawa, Y. Obayashi, Kwangmin Oh, Masatake Ohashi, T. Ohashi, Masashi Ohkawa, Yoshihiro Okutani, Ken-ichi Oohara, S. Oshino, K. Pan, A. Parisi, June Park, F. E. Peña Arellano, Surojit Saha, Kazuki Sakai, T. Sawada, Yuichiro Sekiguchi, Lijing Shao, Yutaka Shikano
Abstract
KAGRA is a gravitational-wave (GW) detector constructed in Japan with two unique key features: It was constructed underground, and the test-mass mirrors are cooled to cryogenic temperatures. These features are not included in other kilometer-scale detectors but will be adopted in future detectors such as the Einstein Telescope. KAGRA performed its first joint observation run with GEO600 in 2020. In this observation, the sensitivity of KAGRA to GWs was inferior to that of other kilometer-scale detectors such as LIGO and Virgo. However, further upgrades to the detector are ongoing to reach the sensitivity for detecting GWs in the next observation run, which is scheduled for 2022. In this article, the current situation, sensitivity, and future perspectives are reviewed.