Input optics systems of the KAGRA detector during O3GK

Creators: Akutsu, T.; Ando, M.; Arai, K.; Arai, Y.; Araki, S.; Araya, A.; Aritomi, N.; Asada, H.; Aso, Y.; Bae, S.; Bae, Y.; Baiotti, L.; Bajpai, R.; Barton, M. A.; Cannon, K.; Cao, Z.; Capocasa, E.; Chan, M.; Chen, C.; Chen, K.; Chen, Y.; Chiang, C.-I.; Chu, H.; Chu, Y.-K.; Eguchi, S.; Enomoto, Y.; Flaminio, R.; Fujii, Y.; Fujikawa, Y.; Fukunaga, M.; Fukushima, M.; Furuhata, T.; Gao, D.; Ge, G.-G.; Ha, S.; Hagiwara, A.; Haino, S.; Han, W.-B.; Hasegawa, K.; Hattori, K.; Hayakawa, H.; Hayama, K.; Himemoto, Y.; Hiranuma, Y.; Hirata, N.; Hirose, E.; Hong, Z.; Hsieh, B.-H.; Huang, G.-Z.; Huang, H.-Y.; Huang, P.; Huang, Y.-C.; Huang, Y.-J.; Hui, D. C. Y.; Ide, S.; Ikenoue, B.; Imam, S.; Inayoshi, K.; 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.; Kanbara, S.; Kanda, N.; Kang, G.; Kataoka, Y.; Kawaguchi, K.; Kawai, N.; Kawasaki, T.; Kim, C.; 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.; 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.; Lee, R.; Leonardi, M.; Li, K. L.; Lin, L. C.-C.; Lin, C.-Y.; Lin, F.-K.; Lin, F.-L.; Lin, H. L.; Liu, G. C.; Luo, L.-W.; Majorana, E.; Marchio, M.; Michimura, Y.; Mio, N.; Miyakawa, O.; Miyamoto, A.; Miyazaki, Y.; Miyo, K.; Miyoki, S.; Mori, Y.; Morisaki, S.; Moriwaki, Y.; Nagano, K.; Nagano, S.; Nakamura, K.; Nakano, H.; Nakano, M.; Nakashima, R.; Nakayama, Y.; Narikawa, T.; Naticchioni, L.; Negishi, R.; Nguyen Quynh, L.; Ni, W-T; Nishizawa, A.; Nozaki, S.; Obuchi, Y.; Ogaki, W.; Oh, J. J.; 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.-C.; Pang, H.; Parisi, A.; Park, J.; Peña Arellano, F. E.; 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.; Shishido, T.; Shoda, A.; Somiya, K.; Son, E. J.; Sotani, H.; Sugimoto, R.; Suresh, J.; Suzuki, T.; Suzuki, T.; Tagoshi, H.; Takahashi, H.; Takahashi, R.; Takamori, A.; Takano, S.; Takeda, H.; Takeda, M.; Tanaka, H.; Tanaka, K.; Tanaka, K.; Tanaka, T.; Tanaka, T.; Tanioka, S.; Tapia San Martín, E. N.; Telada, S.; Tomaru, T.; Tomigami, Y.; Tomura, T.; Travasso, F.; 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.; Ueno, K.; Ueshima, G.; Uraguchi, F.; Ushiba, T.; van Putten, M. H. P. M.; Vocca, H.; Wang, J.; Washimi, T.; Wu, C.; Wu, H.; Wu, S.; Xu, W.-R.; Yamada, T.; Yamamoto, K.; Yamamoto, K.; Yamamoto, T.; Yamashita, K.; Yamazaki, R.; Yang, Y.; Yano, K.; Yokogawa, K.; Yokoyama, J.; Yokozawa, T.; Yoshioka, T.; Yuzurihara, H.; Zeidler, S.; Zhan, M.; Zhang, H.; Zhao, Y.; Zhu, Z.-H.; Goetz, R.; Heintze, M.; Liu, J.; Müller, C.; Savage, R. L.; Tanner, D. B.

Abstract

KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25 to March 10, 2020, and its first joint observation with the GEO 600 detector from April 7 to April 21, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensity and frequency stabilization systems, modulators, a Faraday isolator, mode-matching telescopes, and a high-power beam dump. These optics were successfully delivered to the KAGRA interferometer and operated stably during the observations. The laser frequency noise was observed to limit the detector sensitivity above a few kilohertz, whereas the laser intensity did not significantly limit the detector sensitivity.

Additional Information

© The Author(s) 2022. Published by Oxford University Press on behalf of the Physical Society of Japan. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. 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 and 20H05639, JSPS Grant-in-Aid for Transformative Research Areas (A) 20A203: JP20H05854, the joint research program of the Institute for Cosmic Ray Research, University of Tokyo, National Research Foundation (NRF), Computing Infrastructure Project of KISTI-GSDC, Korea Astronomy and Space Science Institute (KASI), and Ministry of Science and ICT (MSIT) 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, and Mechanical Engineering Center of KEK.

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