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

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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

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.

Original languageEnglish
Article number012002
JournalJournal of Physics: Conference Series
Volume1857
Issue number1
DOIs
Publication statusPublished - 2021 Apr 19
Event10th Asian Conference on Applied Superconductivity and Cryogenics, ACASC 2020, 2nd International Cryogenic Materials Conference in Asia, Asian-ICMC 2020 and CSSJ Joint Conference - Okinawa, Japan
Duration: 2020 Jan 62020 Jan 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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