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Published April 19, 2021 | Published
Journal Article Open

Radiative Cooling of the Thermally Isolated System in KAGRA Gravitational Wave Telescope

Akutsu, T. ORCID icon
Ando, M.
Arai, K.
Arai, Y.
Araki, S.
Araya, A.
Aritomi, N.
Aso, Y.
Bae, S.-W.
Bae, Y.-B.
Baiotti, L.
Bajpai, R.
Barton, M. A.
Cannon, K.
Capocasa, E.
Chan, M.-L.
Chen, C.-S.
Chen, K.-H.
Chen, Y.-R.
Chu, H.-Y.
Chu, Y.-K.
Eguchi, S.
Enomoto, Y.
Flaminio, R.
Fujii, Y.
Fukunaga, M.
Fukushima, M.
Ge, G.-G.
Hagiwara, A.
Haino, S.
Hasegawa, K.
Hayakawa, H.
Hayama, K.
Himemoto, Y.
Hiranuma, Y.
Hirata, N.
Hirose, E.
Hong, Z.
Hsieh, B.-H.
Huang, G.-Z.
Huang, P.-W.
Huang, Y.-J.
Ikenoue, B.
Imam, S.
Inayoshi, K.
Inoue, Y.
Ioka, K.
Itoh, Y.
Izumi, K.
Jung, K.
Jung, P.
Kajita, T.
Kamiizumi, M.
Kanda, N.
Kang, G.-W.
Kawaguchi, K.
Kawai, N.
Kawasaki, T.
Kim, C.
Kim, J.
Kim, W.
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.-M.
Kuo, H.-S.
Kuroyanagi, S.
Kusayanagi, K.
Kwak, K.
Lee, H.-K.
Lee, H.-W.
Lee, R.-K.
Leonardi, M.
Lin, C.-Y.
Lin, F.-L.
Lin, L. C.-C.
Liu, G.-C.
Luo, L.-W.
Marchio, M.
Michimura, Y.
Mio, N.
Miyakawa, O.
Miyamoto, A.
Miyazaki, Y.
Miyo, K.
Miyoki, S.
Morisaki, S.
Moriwaki, Y.
Nagano, K.
Nagano, S.
Nakamura, K.
Nakano, H.
Nakano, M.
Nakashima, R.
Narikawa, T.
Negishi, R.
Ni, W.-T.
Nishizawa, A.
Obuchi, Y.
Ogaki, W.
Oh, J. J.
Oh, S.-H.
Ohashi, M.
Ohishi, N.
Ohkawa, M.
Okutomi, K.
Oohara, K.
Ooi, C.-P.
Oshino, S.
Pan, K.-C.
Pang, H.-F.
Park, J.
Peiia 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.
Shibagaki, S.
Shimizu, R.
Shimoda, T.
Shimode, K.
Shinkai, H.
Shishido, T.
Shoda, A.
Somiya, K.
Son, E. J.
Sotani, H.
Sugimoto, R.
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 Martin, E. N.
Telada, S.
Tomaru, T.
Tomigami, Y.
Tomura, T.
Travasso, F.
Trozzo, L.
Tsang, T. T. L.
Tsubono, K.
Tsuchida, S.
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.
Wu, C.-M.
Wu, H.-C.
Wu, S.-R.
Xu, W.-R.
Yamada, T.
Yamamoto, K.
Yamamoto, K.
Yamamoto, T.
Yokogawa, K.
Yokoyama, J.
Yokozawa, T.
Yoshioka, T.
Yuzurihara, H.
Zeidler, S.
Zhao, Y.
Zhu, Z.-H.


Radiative cooling of the thermally isolated system is investigated in KAGRA gravitational wave telescope. KAGRA is a laser interferometer-based detector and main mirrors constituting optical cavities are cool down to 20K to reduce noises caused by the thermal fluctuation. The mirror is suspended with the multi-stage pendulum to isolate any vibration. Therefore, this mirror suspension system has few heat links to reduce vibration injection. Thus, this system is mainly cooled down with thermal radiation. In order to understand the process of radiative cooling of the mirror, we analyzed cooling curve based on mass and specific heat. As a result, it was newly found that a cryogenic part called "cryogenic duct-shield" seems to have large contribution in the beginning of the mirror cooling. This finding will help to design new cooling system for the next generation cryogenic gravitational wave detector.

Additional Information

© 2021 The Author(s). Published under licence by IOP Publishing Ltd. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. 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, the LIGO project, and the Virgo project.

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