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1. Application of the independent component analysis to the iKAGRA data

Author

KAGRA Collaboration, Akutsu, T., Ando, M., Arai, K., Arai, Y., Araki, S., Araya, A., Aritomi, N., Asada, H., Aso, Y., Atsuta, S., Awai, K., Bae, S., Bae, Y., Baiotti, L., Bajpai, R., Barton, M. A., Cannon, K., Capocasa, E., Chan, M., Chen, C., Chen, K., Chen, Y., Chu, H., Chu, Y-K., Craig, K., Creus, W., Doi, K., Eda, K., Eguchi, S., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Fukunaga, M., Fukushima, M., Furuhata, T., Ge, G., Hagiwara, A., Haino, S., Hasegawa, K., Hashino, K., Hayakawa, H., Hayama, K., Himemoto, Y., Hiranuma, Y., Hirata, N., Hirobayashi, S., Hirose, E., Hong, Z., Hsieh, B. H., Huang, G-Z., Huang, P., Huang, Y., Ikenoue, B., Imam, S., Inayoshi, K., Inoue, Y., Ioka, K., Itoh, Y., Izumi, K., Jung, K., Jung, P., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kanbara, S., Kanda, N., Kanemura, S., Kaneyama, M., Kang, G., Kasuya, J., Kataoka, Y., Kawaguchi, K., Kawai, N., Kawamura, S., Kawasaki, T., Kim, C., Kim, J. C., Kim, W. S., Kim, Y. -M., Kimura, N., Kinugawa, T., Kirii, S., Kita, N., Kitaoka, Y., 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., Kuroyanagi, S., Kusayanagi, K., Kwak, K., Lee, H. K., Lee, H. M., Lee, H. W., Lee, R., Leonardi, M., Lin, C., Lin, C-Y., Lin, F-L., Liu, G. C., Liu, Y., Luo, L., Majorana, E., Mano, S., Marchio, M., Matsui, T., Matsushima, F., Michimura, Y., Mio, N., Miyakawa, O., Miyamoto, A., Miyamoto, T., Miyazaki, Y., Miyo, K., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Morozumi, T., Musha, M., Nagano, K., Nagano, S., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Nakao, K., Nakashima, R., Narikawa, T., Naticchioni, L., Negishi, R., Quynh, L. Nguyen, Ni, W. -T., Nishizawa, A., Obuchi, Y., Ochi, T., 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., Pang, H., Park, J., Arellano, F. E. Pena, Pinto, I., Sago, N., Saijo, M., Saito, S., Saito, Y., Sakai, K., Sakai, Y., Sakuno, Y., Sasaki, M., Sasaki, Y., Sato, S., Sato, T., Sawada, T., Sekiguchi, T., Sekiguchi, Y., Seto, N., Shibagaki, S., Shibata, M., Shimizu, R., Shimoda, T., Shimode, K., Shinkai, H., Shishido, T., Shoda, A., Somiya, K., Son, E. J., Sotani, H., Suemasa, A., Sugimoto, R., Suzuki, T., Tagoshi, H., Takahashi, H., Takahashi, R., Takamori, A., Takano, S., Takeda, H., Takeda, M., Tanaka, H., Tanaka, K., Tanaka, T., Tanioka, S., Martin, E. N. Tapia San, Tatsumi, D., Telada, S., Tomaru, T., Tomigami, Y., Tomura, T., Travasso, F., Trozzo, L., Tsang, T., Tsubono, K., Tsuchida, S., Tsuzuki, T., Tuyenbayev, D., Uchikata, N., Uchiyama, T., Ueda, A., Uehara, T., Ueki, S., Ueno, K., Ueshima, G., Uraguchi, F., Ushiba, T., van Putten, M. H. P. M., Vocca, H., Wada, S., Wakamatsu, T., Wang, J., Wu, C., Wu, H., Wu, S., Xu, W-R., Yamada, T., Yamamoto, A., Yamamoto, K., Yamamoto, S., Yamamoto, T., Yokogawa, K., Yokoyama, J., Yokozawa, T., Yoon, T. H., Yoshioka, T., Yuzurihara, H., Zeidler, S., Zhao, Y., and Zhu, Z. -H.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology
Abstract

We apply the independent component analysis (ICA) to the real data from a gravitational wave detector for the first time. Specifically we use the iKAGRA data taken in April 2016, and calculate the correlations between the gravitational wave strain channel and 35 physical environmental channels. Using a couple of seismic channels which are found to be strongly correlated with the strain, we perform ICA. Injecting a sinusoidal continuous signal in the strain channel, we find that ICA recovers correct parameters with enhanced signal-to-noise ratio, which demonstrates usefulness of this method. Among the two implementations of ICA used here, we find the correlation method yields the optimal result for the case environmental noises act on the strain channel linearly., Comment: 27 pages, 12 figures : published in PTEP with added discussion about the relation between ICA and Wiener filtering

Published
2019
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2. First cryogenic test operation of underground km-scale gravitational-wave observatory KAGRA

Author

KAGRA Collaboration, Akutsu, T., Ando, M., Arai, K., Arai, Y., Araki, S., Araya, A., Aritomi, N., Asada, H., Aso, Y., Atsuta, S., Awai, K., Bae, S., Baiotti, L., Barton, M. A., Cannon, K., Capocasa, E., Chen, C-S., Chiu, T-W., Cho, K., Chu, Y-K., Craig, K., Creus, W., Doi, K., Eda, K., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Fukunaga, M., Fukushima, M., Furuhata, T., Hagiwara, A., Haino, S., Hasegawa, K., Hashino, K., Hayama, K., Hirobayashi, S., Hirose, E., Hsieh, B. H., Huang, C-Z., Ikenoue, B., Inoue, Y., Ioka, K., Itoh, Y., Izumi, K., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kanbara, S., Kanda, N., Kanemura, S., Kaneyama, M., Kang, G., Kasuya, J., Kataoka, Y., Kawai, N., Kawamura, S., Kawasaki, T., Kim, C., Kim, J., Kim, J. C., Kim, W. S., Kim, Y. -M., Kimura, N., Kinugawa, T., Kirii, S., Kitaoka, Y., Kitazawa, H., Kojima, Y., Kokeyama, K., Komori, K., Kong, A. K. H., Kotake, K., Kozu, R., Kumar, R., Kuo, H-S., Kuroyanagi, S., Lee, H. K., Lee, H. M., Lee, H. W., Leonardi, M., Lin, C-Y., Lin, F-L., Liu, G. C., Liu, Y., Majorana, E., Mano, S., Marchio, M., Matsui, T., Matsushima, F., Michimura, Y., Mio, N., Miyakawa, O., Miyamoto, A., Miyamoto, T., Miyo, K., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Morozumi, T., Murakami, I., Musha, M., Nagano, K., Nagano, S., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Nakao, K., Namai, Y., Narikawa, T., Naticchioni, L., Quynh, L. Nguyen, Ni, W. -T., Nishizawa, A., Obuchi, Y., Ochi, T., Oh, J. J., Oh, S. H., Ohashi, M., Ohishi, N., Ohkawa, M., Okutomi, K., Ono, K., Oohara, K., Ooi, C. P., Pan, S-S., Park, J., Arellano, F. E. Peña, Pinto, I., Sago, N., Saijo, M., Saito, Y., Saitou, S., Sakai, K., Sakai, Y., Sasai, M., Sasaki, M., Sasaki, Y., Sato, N., Sato, S., Sato, T., Sekiguchi, Y., Seto, N., Shibata, M., Shimoda, T., Shinkai, H., Shishido, T., Shoda, A., Somiya, K., Son, E. J., Suemasa, A., Suzuki, T., Tagoshi, H., Tahara, H., Takahashi, H., Takahashi, R., Takamori, A., Takeda, H., Tanaka, H., Tanaka, K., Tanaka, T., Tanioka, S., Martin, E. N. Tapia San, Tatsumi, D., Terashima, S., Tomaru, T., Tomura, T., Travasso, F., Tsubono, K., Tsuchida, S., Uchikata, N., Uchiyama, T., Ueda, A., Uehara, T., Ueki, S., Ueno, K., Uraguchi, F., Ushiba, T., van Putten, M. H. P. M., Vocca, H., Wada, S., Wakamatsu, T., Watanabe, Y., Xu, W-R., Yamada, T., Yamamoto, A., Yamamoto, K., Yamamoto, S., Yamamoto, T., Yokogawa, K., Yokoyama, J., Yokozawa, T., Yoon, T. H., Yoshioka, T., Yuzurihara, H., Zeidler, S., and Zhu, Z. -H.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology, Physics - Instrumentation and Detectors
Abstract

KAGRA is a second-generation interferometric gravitational-wave detector with 3-km arms constructed at Kamioka, Gifu in Japan. It is now in its final installation phase, which we call bKAGRA (baseline KAGRA), with scientific observations expected to begin in late 2019. One of the advantages of KAGRA is its underground location of at least 200 m below the ground surface, which brings small seismic motion at low frequencies and high stability of the detector. Another advantage is that it cools down the sapphire test mass mirrors to cryogenic temperatures to reduce thermal noise. In April-May 2018, we have operated a 3-km Michelson interferometer with a cryogenic test mass for 10 days, which was the first time that km-scale interferometer was operated at cryogenic temperatures. In this article, we report the results of this "bKAGRA Phase 1" operation. We have demonstrated the feasibility of 3-km interferometer alignment and control with cryogenic mirrors., Comment: 23 pages, 11 figures

Published
2019
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3. Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA

Author

Akiyama, Y., Akutsu, T., Ando, M., Arai, K., Arai, Y., Araki, S., Araya, A., Aritomi, N., Asada, H., Aso, Y., Bae, S., Baiotti, L., Barton, M. A., Cannon, K., Capocasa, E., Chen, C-S., Chiu, T-W., Cho, K., Chu, Y-K., Craig, K., Dattilo, V., Doi, K., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Fukunaga, M., Fukushima, M., Furuhata, T., Haino, S., Hasegawa, K., Hashimoto, Y., Hashino, K., Hayama, K., Hirayama, T., Hirose, E., Hsieh, B. H., Huang, C-Z., Ikenoue, B., Inoue, Y., Ioka, K., Itoh, Y., Izumi, K., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kanbara, S., Kanda, N., Kanemura, S., Kang, G., Kasuya, J., Kawai, N., Kawasaki, T., Kim, C., Kim, W. S., Kim, J., Kim, J. C., Kimura, N., Kirii, S., Kitaoka, Y., Kitazawa, H., Kojima, Y., Kokeyama, K., Komori, K., Kong, A., Kotake, K., Kozu, R., Kumar, R., Kuo, H-S., Kuroki, S., Kuroyanagi, S., Lee, H. K., Lee, H. M., Lee, H. W., Leonardi, M., Lin, C-Y., Lin, F-L., Liu, G. C., Marchio, M., Matsui, T., Michimura, Y., Mio, N., Miyakawa, O., Miyamoto, A., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Musha, M., Nagano, S., Nagano, K., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Narikawa, T., Quynh, L. Nguyen, Ni, W. -T., Nishizawa, A., Obuchi, Y., Oh, J., Oh, S. H., Ohashi, M., Ohishi, N., Ohkawa, M., Okutomi, K., Ono, K., Oohara, K., Ooi, C. P., Pan, S-S., Paoletti, F., Park, J., Passaquieti, R., Arellano, F. E. Peña, Sago, N., Saito, S., Saito, Y., Sakai, K., Sakai, Y., Sasai, M., Sato, S., Sato, T., Sekiguchi, T., Sekiguchi, Y., Shibata, M., Shimoda, T., Shinkai, H., Shishido, T., Shoda, A., Someya, N., Somiya, K., Son, E. J., Suemasa, A., Suzuki, T., Tagoshi, H., Tahara, H., Takahashi, H., Takahashi, R., Takeda, H., Tanaka, H., Tanaka, K., Tanaka, T., Tanioka, S., SanMartin, E. N. Tapia, Tomaru, T., Tomura, T., Travasso, F., Tsubono, K., Tsuchida, S., Uchikata, N., Uchiyama, T., Uehara, T., Ueno, K., Uraguchi, F., Ushiba, T., van Putten, M. H. P. M., Vocca, H., Wakamatsu, T., Watanabe, Y., Xu, W-R., Yamada, T., Yamamoto, K., Yamamoto, S., Yamamoto, T., Yokogawa, K., Yokoyama, J., Yokozawa, T., Yoshioka, T., Yuzurihara, H., Zeidler, S., and Zhu, Z. -H.

Subjects
Physics - Instrumentation and Detectors, General Relativity and Quantum Cosmology
Abstract

A vibration isolation system called Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics.

Published
2019
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4. KAGRA: 2.5 Generation Interferometric Gravitational Wave Detector

Author

Akutsu, T., Ando, M., Arai, K., Arai, Y., Araki, S., Araya, A., Aritomi, N., Asada, H., Aso, Y., Atsuta, S., Awai, K., Bae, S., Baiotti, L., Barton, M. A., Cannon, K., Capocasa, E., Chen, C-S., Chiu, T-W., Cho, K., Chu, Y-K., Craig, K., Creus, W., Doi, K., Eda, K., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Fukunaga, M., Fukushima, M., Furuhata, T., Haino, S., Hasegawa, K., Hashino, K., Hayama, K., Hirobayashi, S., Hirose, E., Hsieh, B. H., Huang, C-Z., Ikenoue, B., Inoue, Y., Ioka, K., Itoh, Y., Izumi, K., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kanbara, S., Kanda, N., Kanemura, S., Kaneyama, M., Kang, G., Kasuya, J., Kataoka, Y., Kawai, N., Kawamura, S., Kawasaki, T., Kim, C., Kim, J., Kim, J. C., Kim, W. S., Kim, Y. -M., Kimura, N., Kinugawa, T., Kirii, S., Kitaoka, Y., Kitazawa, H., Kojima, Y., Kokeyama, K., Komori, K., Kong, A. K. H., Kotake, K., Kozu, R., Kumar, R., Kuo, H-S., Kuroyanagi, S., Lee, H. K., Lee, H. M., Lee, H. W., Leonardi, M., Lin, C-Y., Lin, F-L., Liu, G. C., Liu, Y., Majorana, E., Mano, S., Marchio, M., Matsui, T., Matsushima, F., Michimura, Y., Mio, N., Miyakawa, O., Miyamoto, A., Miyamoto, T., Miyo, K., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Morozumi, T., Musha, M., Nagano, K., Nagano, S., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Nakao, K., Narikawa, T., Naticchioni, L., Quynh, L. Nguyen, Ni, W. -T., Nishizawa, A., Ochi, T., Oh, J. J., Oh, S. H., Ohashi, M., Ohishi, N., Ohkawa, M., Okutomi, K., Ono, K., Oohara, K., Ooi, C. P., Pan, S-S., Park, J., Arellano, F. E. Peña, Pinto, I., Sago, N., Saijo, M., Saito, Y., Sakai, K., Sakai, Y., Sasai, M., Sasaki, M., Sasaki, Y., Sato, S., Sato, T., Sekiguchi, Y., Seto, N., Shibata, M., Shimoda, T., Shinkai, H., Shishido, T., Shoda, A., Somiya, K., Son, E. J., Suemasa, A., Suzuki, T., Tagoshi, H., Tahara, H., Takahashi, H., Takahashi, R., Takamori, A., Takeda, H., Tanaka, H., Tanaka, K., Tanaka, T., Tanioka, S., Martin, E. N. Tapia San, Tatsumi, D., Tomaru, T., Tomura, T., Travasso, F., Tsubono, K., Tsuchida, S., Uchikata, N., Uchiyama, T., Uehara, T., Ueki, S., Ueno, K., Ushiba, T., van Putten, M. H. P. M., Vocca, H., Wada, S., Wakamatsu, T., Watanabe, Y., Xu, W-R., Yamada, T., Yamamoto, A., Yamamoto, K., Yamamoto, S., Yamamoto, T., Yokogawa, K., Yokoyama, J., Yokozawa, T., Yoon, T. H., Yoshioka, T., Yuzurihara, H., Zeidler, S., and Zhu, Z. -H.

Subjects
General Relativity and Quantum Cosmology, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

The recent detections of gravitational waves (GWs) reported by LIGO/Virgo collaborations have made significant impact on physics and astronomy. A global network of GW detectors will play a key role to solve the unknown nature of the sources in coordinated observations with astronomical telescopes and detectors. Here we introduce KAGRA (former name LCGT; Large-scale Cryogenic Gravitational wave Telescope), a new GW detector with two 3-km baseline arms arranged in the shape of an "L", located inside the Mt. Ikenoyama, Kamioka, Gifu, Japan. KAGRA's design is similar to those of the second generations such as Advanced LIGO/Virgo, but it will be operating at the cryogenic temperature with sapphire mirrors. This low temperature feature is advantageous for improving the sensitivity around 100 Hz and is considered as an important feature for the third generation GW detector concept (e.g. Einstein Telescope of Europe or Cosmic Explorer of USA). Hence, KAGRA is often called as a 2.5 generation GW detector based on laser interferometry. The installation and commissioning of KAGRA is underway and its cryogenic systems have been successfully tested in May, 2018. KAGRA's first observation run is scheduled in late 2019, aiming to join the third observation run (O3) of the advanced LIGO/Virgo network. In this work, we describe a brief history of KAGRA and highlights of main feature. We also discuss the prospects of GW observation with KAGRA in the era of O3. When operating along with the existing GW detectors, KAGRA will be helpful to locate a GW source more accurately and to determine the source parameters with higher precision, providing information for follow-up observations of a GW trigger candidate., Comment: 6 pages, 3 figures (quality of some figures has been reduced)

Published
2018
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5. The status of KAGRA underground cryogenic gravitational wave telescope

Author

KAGRA Collaboration, Akutsu, T., Ando, M., Araya, A., Aritomi, N., Asada, H., Aso, Y., Atsuta, S., Awai, K., Barton, M. A., Cannon, K., Craig, K., Creus, W., Doi, K., Eda, K., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Furuhata, T., Haino, S., Hasegawa, K., Hashino, K., Hayama, K., Hirobayashi, S., Hirose, E., Hsieh, B. H., Inoue, Y., Ioka, K., Itoh, Y., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kambara, S., Kanda, N., Kanemura, S., Kaneyama, M., Kang, G., Kasuya, J., Kataoka, Y., Kawai, N., Kawamura, S., Kim, C., Kim, H., Kim, J., Kim, Y., Kimura, N., Kinugawa, T., Kirii, S., Kitaoka, Y., Kojima, Y., Kokeyama, K., Komori, K., Kotake, K., Kumar, R., Lee, H., Liu, Y., Luca, N., Majorana, E., Mano, S., Marchio, M., Matsui, T., Matsushima, F., Michimura, Y., Miyakawa, O., Miyamoto, T., Miyamoto, A., Miyo, K., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Morozumi, T., Musha, M., Nagano, S., Nagano, K., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Nakao, K., Narikawa, T., Quynh, L. Nguyen, Ni, W. -T., Ochi, T., Oh, J., Oh, S., Ohashi, M., Ohishi, N., Ohkawa, M., Okutomi, K., Oohara, K., Alleano, F. E. Peña, Pinto, I., Sago, N., Saijo, M., Saito, Y., Sakai, K., Sakai, Y., Sasaki, Y., Sasaki, M., Sato, S., Sato, T., Sekiguchi, Y., Seto, N., Shibata, M., Shimoda, T., Shinkai, H., Shoda, A., Somiya, K., Son, E., Suemasa, A., Suzuki, T., Tagoshi, H., Takahashi, H., Takahashi, R., Takamori, A., Takeda, H., Tanaka, H., Tanaka, K., Tanaka, T., Tatsumi, D., Tomaru, T., Tomura, T., Travasso, F., Tsubono, K., Tsuchida, S., Uchikata, N., Uchiyama, T., Uehara, T., Ueki, S., Ueno, K., Ushiba, T., van Putten, M. H. P. M., Vocca, H., Wada, S., Wakamatsu, T., Yamada, T., Yamamoto, S., Yamamoto, T., Yamamoto, K., Yamamoto, A., Yokoyama, J., Yokozawa, T., Yoon, T. H., Yuzurihara, H., Zeidler, S., and Zhu, Z. -H.

Subjects
General Relativity and Quantum Cosmology, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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., Comment: 7 pages, 2 figures. Proceedings for XV International Conference on Topics in Astroparticle and Underground Physics (TAUP2017), Sudbury, July 24-28, 2017

Published
2017
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6. Application of independent component analysis to the iKAGRA data

Author

Akutsu, T., Ando, M., Arai, K., Arai, Y., Araki, S., Araya, A., Aritomi, N., Asada, H., Aso, Y., Atsuta, S., Awai, K., Bae, S., Bae, Y., Baiotti, L., Bajpai, R., Barton, M. A., Cannon, K., Capocasa, E., Chan, M., Chen, C., Chen, K., Chen, Y., Chu, H., Chu, Y. -K., Craig, K., Creus, W., Doi, K., Eda, K., Eguchi, S., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Fukunaga, M., Fukushima, M., Furuhata, T., Ge, G., Hagiwara, A., Haino, S., Hasegawa, K., Hashino, K., Hayakawa, H., Hayama, K., Himemoto, Y., Hiranuma, Y., Hirata, N., Hirobayashi, S., Hirose, E., Hong, Z., Hsieh, B. H., Huang, G. -Z., Huang, P., Huang, Y., Ikenoue, B., Imam, S., Inayoshi, K., Inoue, Y., Ioka, K., Itoh, Y., Izumi, K., Jung, K., Jung, P., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kanbara, S., Kanda, N., Kanemura, S., Kaneyama, M., Kang, G., Kasuya, J., Kataoka, Y., Kawaguchi, K., Kawai, N., Kawamura, S., Kawasaki, T., Kim, C., Kim, J. C., Kim, W. S., Kim, Y. -M., Kimura, N., Kinugawa, T., Kirii, S., Kita, N., Kitaoka, Y., 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., Kuroyanagi, S., Kusayanagi, K., Kwak, K., Lee, H. K., Lee, H. M., Lee, H. W., Lee, R., Leonardi, M., Lin, C., Lin, C. -Y., Lin, F. -L., Liu, G. C., Liu, Y., Luo, L., Majorana, E., Mano, S., Marchio, M., Matsui, T., Matsushima, F., Michimura, Y., Mio, N., Miyakawa, O., Miyamoto, A., Miyamoto, T., Miyazaki, Y., Miyo, K., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Morozumi, T., Musha, M., Nagano, K., Nagano, S., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Nakao, K., Nakashima, R., Narikawa, T., Naticchioni, L., Negishi, R., Quynh, L. N., W. -T., Ni, Nishizawa, A., Obuchi, Y., Ochi, T., Ogaki, W., J. J., Oh, S. H., Oh, Ohashi, M., Ohishi, N., Ohkawa, M., Okutomi, K., Oohara, K., Ooi, C. P., Oshino, S., Pan, K., Pang, H., Park, J., Arellano, F. E. P., Pinto, I., Sago, N., Saijo, M., Saito, S., Saito, Y., Sakai, K., Sakai, Y., Sakuno, Y., Sasaki, M., Sasaki, Y., Sato, S., Sato, T., Sawada, T., Sekiguchi, T., Sekiguchi, Y., Seto, N., Shibagaki, S., Shibata, M., Shimizu, R., Shimoda, T., Shimode, K., Shinkai, H., Shishido, T., Shoda, A., Somiya, K., Son, E. J., Sotani, H., Suemasa, A., Sugimoto, R., Suzuki, T., Tagoshi, H., Takahashi, H., Takahashi, R., Takamori, A., Takano, S., Takeda, H., Takeda, M., Tanaka, H., Tanaka, K., Tanaka, T., Tanioka, S., Martin, E. N. T. S., Tatsumi, D., Telada, S., Tomaru, T., Tomigami, Y., Tomura, T., Travasso, F., Trozzo, L., Tsang, T., Tsubono, K., Tsuchida, S., Tsuzuki, T., Tuyenbayev, D., Uchikata, N., Uchiyama, T., Ueda, A., Uehara, T., Ueki, S., Ueno, K., Ueshima, G., Uraguchi, F., Ushiba, T., Van Putten, M. H. P. M., Vocca, H., Wada, S., Wakamatsu, T., Wang, J., Wu, C., Wu, H., Wu, S., W. -R., Xu, Yamada, T., Yamamoto, A., Yamamoto, K., Yamamoto, S., Yamamoto, T., Yokogawa, K., Yokoyama, J., Yokozawa, T., Yoon, T. H., Yoshioka, T., Yuzurihara, H., Zeidler, S., Zhao, Y., Zhu, Z. -H., KAGRA Collaboration, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), KAGRA, Laboratoire d'Annecy de Physique des Particules (LAPP), and Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Gravitational-wave observatory, General Physics and Astronomy, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), 01 natural sciences, GRAVITATIONAL-WAVES, General Relativity and Quantum Cosmology, 0103 physical sciences, Continuous signal, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], F30 Instrumentation and technique, Environmental noise, 010303 astronomy & astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Physics, Strain (chemistry), 010308 nuclear & particles physics, Gravitational wave, Independent component analysis, E02 Gravitational waves, SEPARATION, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Correlation method, Astrophysics - Instrumentation and Methods for Astrophysics, Algorithm, Communication channel
Abstract

We apply the independent component analysis (ICA) to the real data from a gravitational wave detector for the first time. Specifically we use the iKAGRA data taken in April 2016, and calculate the correlations between the gravitational wave strain channel and 35 physical environmental channels. Using a couple of seismic channels which are found to be strongly correlated with the strain, we perform ICA. Injecting a sinusoidal continuous signal in the strain channel, we find that ICA recovers correct parameters with enhanced signal-to-noise ratio, which demonstrates usefulness of this method. Among the two implementations of ICA used here, we find the correlation method yields the optimal result for the case environmental noises act on the strain channel linearly., 27 pages, 12 figures : published in PTEP with added discussion about the relation between ICA and Wiener filtering

Published
2020
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7. The status of KAGRA underground cryogenic gravitational wave telescope

Author

Akutsu, T., primary, Ando, M., additional, Araya, A., additional, Aritomi, N., additional, Asada, H., additional, Aso, Y., additional, Atsuta, S., additional, Awai, K., additional, Barton, M. A., additional, Cannon, K., additional, Craig, K., additional, Creus, W., additional, Doi, K., additional, Eda, K., additional, Enomoto, Y., additional, Flaminio, R., additional, Fujii, Y., additional, Fujimoto, M.-K., additional, Furuhata, T., additional, Haino, S., additional, Hasegawa, K., additional, Hashino, K., additional, Hayama, K., additional, Hirobayashi, S., additional, Hirose, E., additional, Hsieh, A. H., additional, Inoue, Y., additional, Ioka, K., additional, Itoh, Y., additional, Kaji, T., additional, Kajita, T., additional, Kakizaki, M., additional, Kamiizumi, M., additional, Kambara, S., additional, Kanda, N., additional, Kanemura, S., additional, Kaneyama, M., additional, Kang, G., additional, Kasuya, J., additional, Kataoka, Y., additional, Kawai, N., additional, Kawamura, S., additional, Kim, C., additional, Kim, H., additional, Kim, J., additional, Kim, Y., additional, Kimura, N., additional, Kinugawa, T., additional, Kirii, S., additional, Kitaoka, Y., additional, Kojima, Y., additional, Kokeyama, K., additional, Komori, K., additional, Kotake, K., additional, Kumar, R., additional, Lee, H., additional, Liu, Y., additional, Luca, N., additional, Majorana, E., additional, Mano, S., additional, Marchio, M., additional, Matsui, T., additional, Matsushima, F., additional, Michimura, Y., additional, Miyakawa, O., additional, Miyamoto, T., additional, Miyamoto, A., additional, Miyo, K., additional, Miyoki, S., additional, Morii, W., additional, Morisaki, S., additional, Moriwaki, Y., additional, Morozumi, T., additional, Musha, M., additional, Nagano, S., additional, Nagano, K., additional, Nakamura, K., additional, Nakamura, T., additional, Nakano, H., additional, Nakano, M., additional, Nakao, K., additional, Narikawa, T., additional, Quynh, L.Nguyen, additional, Ni, W.-T., additional, Ochi, T., additional, Oh, J., additional, Oh, S., additional, Ohashi, M., additional, Ohishi, N., additional, Ohkawa, M., additional, Okutomi, K., additional, Oohara, K., additional, Alleano, F. E.Peña, additional, Pinto, I., additional, Sago, N., additional, Saijo, M., additional, Saito, Y., additional, Sakai, K., additional, Sakai, Y., additional, Sasaki, Y., additional, Sasaki, M., additional, Sato, S., additional, Sato, T., additional, Sekiguchi, Y., additional, Seto, N., additional, Shibata, M., additional, Shimoda, T., additional, Shinkai, H., additional, Shoda, A., additional, Somiya, K., additional, Son, E., additional, Suemasa, A., additional, Suzuki, T., additional, Tagoshi, H., additional, Takahashi, H., additional, Takahashi, R., additional, Takamori, A., additional, Takeda, H., additional, Tanaka, H., additional, Tanaka, K., additional, Tanaka, T., additional, Tatsumi, D., additional, Tomaru, T., additional, Tomura, T., additional, Travasso, F., additional, Tsubono, K., additional, Tsuchida, S., additional, Uchikata, N., additional, Uchiyama, T., additional, Uehara, T., additional, Ueki, S., additional, Ueno, K., additional, Ushiba, T., additional, van Putten, M. H. P. M., additional, Vocca, H., additional, Wada, S., additional, Wakamatsu, T., additional, Yamada, T., additional, Yamamoto, S., additional, Yamamoto, T., additional, Yamamoto, K., additional, Yamamoto, A., additional, Yokoyama, J., additional, Yokozawa, T., additional, Yoon, T. H., additional, Yuzurihara, H., additional, Zeidler, S., additional, and Zhu, Z.-H., additional

Published
2020
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8. Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA

Author

Akiyama, Y, primary, Akutsu, T, additional, Ando, M, additional, Arai, K, additional, Arai, Y, additional, Araki, S, additional, Araya, A, additional, Aritomi, N, additional, Asada, H, additional, Aso, Y, additional, Bae, S, additional, Baiotti, L, additional, Barton, M A, additional, Cannon, K, additional, Capocasa, E, additional, Chen, C-S, additional, Chiu, T-W, additional, Cho, K, additional, Chu, Y-K, additional, Craig, K, additional, Dattilo, V, additional, Doi, K, additional, Enomoto, Y, additional, Flaminio, R, additional, Fujii, Y, additional, Fujimoto, M-K, additional, Fukunaga, M, additional, Fukushima, M, additional, Furuhata, T, additional, Haino, S, additional, Hasegawa, K, additional, Hashimoto, Y, additional, Hashino, K, additional, Hayama, K, additional, Hirayama, T, additional, Hirose, E, additional, Hsieh, B H, additional, Huang, C-Z, additional, Ikenoue, B, additional, Inoue, Y, additional, Ioka, K, additional, Itoh, Y, additional, Izumi, K, additional, Kaji, T, additional, Kajita, T, additional, Kakizaki, M, additional, Kamiizumi, M, additional, Kanbara, S, additional, Kanda, N, additional, Kanemura, S, additional, Kang, G, additional, Kasuya, J, additional, Kawai, N, additional, Kawasaki, T, additional, Kim, C, additional, Kim, W S, additional, Kim, J, additional, Kim, J C, additional, Kimura, N, additional, Kirii, S, additional, Kitaoka, Y, additional, Kitazawa, H, additional, Kojima, Y, additional, Kokeyama, K, additional, Komori, K, additional, Kong, A, additional, Kotake, K, additional, Kozu, R, additional, Kumar, R, additional, Kuo, H-S, additional, Kuroki, S, additional, Kuroyanagi, S, additional, Lee, H K, additional, Lee, H M, additional, Lee, H W, additional, Leonardi, M, additional, Lin, C-Y, additional, Lin, F-L, additional, Liu, G C, additional, Marchio, M, additional, Matsui, T, additional, Michimura, Y, additional, Mio, N, additional, Miyakawa, O, additional, Miyamoto, A, additional, Miyoki, S, additional, Morii, W, additional, Morisaki, S, additional, Moriwaki, Y, additional, Musha, M, additional, Nagano, S, additional, Nagano, K, additional, Nakamura, K, additional, Nakamura, T, additional, Nakano, H, additional, Nakano, M, additional, Narikawa, T, additional, Nguyen Quynh, L, additional, Ni, W-T, additional, Nishizawa, A, additional, Obuchi, Y, additional, Oh, J, additional, Oh, S H, additional, Ohashi, M, additional, Ohishi, N, additional, Ohkawa, M, additional, Okutomi, K, additional, Ono, K, additional, Oohara, K, additional, Ooi, C P, additional, Pan, S-S, additional, Paoletti, F, additional, Park, J, additional, Passaquieti, R, additional, Peña Arellano, F E, additional, Sago, N, additional, Saito, S, additional, Saito, Y, additional, Sakai, K, additional, Sakai, Y, additional, Sasai, M, additional, Sato, S, additional, Sato, T, additional, Sekiguchi, T, additional, Sekiguchi, Y, additional, Shibata, M, additional, Shimoda, T, additional, Shinkai, H, additional, Shishido, T, additional, Shoda, A, additional, Someya, N, additional, Somiya, K, additional, Son, E J, additional, Suemasa, A, additional, Suzuki, T, additional, Tagoshi, H, additional, Tahara, H, additional, Takahashi, H, additional, Takahashi, R, additional, Takeda, H, additional, Tanaka, H, additional, Tanaka, K, additional, Tanaka, T, additional, Tanioka, S, additional, Tapia San Martin, E N, additional, Tomaru, T, additional, Tomura, T, additional, Travasso, F, additional, Tsubono, K, additional, Tsuchida, S, additional, Uchikata, N, additional, Uchiyama, T, additional, Uehara, T, additional, Ueno, K, additional, Uraguchi, F, additional, Ushiba, T, additional, van Putten, M H P M, additional, Vocca, H, additional, Wakamatsu, T, additional, Watanabe, Y, additional, Xu, W-R, additional, Yamada, T, additional, Yamamoto, K, additional, Yamamoto, S, additional, Yamamoto, T, additional, Yokogawa, K, additional, Yokoyama, J, additional, Yokozawa, T, additional, Yoshioka, T, additional, Yuzurihara, H, additional, Zeidler, S, additional, and Zhu, Z-H, additional

Published
2019
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9. KAGRA: 2.5 generation interferometric gravitational wave detector

Author

Hirotaka Takahashi, H. Tahara, T. Miyamoto, Kazuyuki Tanaka, Y. Saito, Mitsuhiro Fukushima, Y. Liu, Albert K. H. Kong, Yoshinori Fujii, G. Kang, Innocenzo M. Pinto, E. J. Son, Sakae Araki, Osamu Miyakawa, Hyun Lee, K. Hasegawa, B. Ikenoue, H-S. Kuo, B. H. Hsieh, Ken Ono, F. L. Lin, C. Z. Huang, Xu W. R., Takaaki Kajita, Yuki Inoue, Akiteru Takamori, Motoyuki Saijo, F. Matsushima, T. Yoshioka, Ken-ichi Nakao, Ni W. T., Kentaro Komori, M. A. Barton, T. Ushiba, R. Flaminio, Simon Zeidler, Luca Baiotti, F. Uraguchi, Y. Sakai, Ettore Majorana, K. Awai, Kieran Craig, K. Yamamoto, Daisuke Tatsumi, Atsushi Nishizawa, Yousuke Itoh, Oh S. H., K. Sakai, S. Kanbara, Kipp Cannon, R. Kozu, Jong-Dae Park, Mitsuru Musha, M. Fukunaga, S. Sato, Masashi Ohkawa, J. Kasuya, N. Uchikata, T. Matsui, Shinya Kanemura, Kyung-Suk Cho, Yutaro Enomoto, S. Wada, Hiroyuki Nakano, Y. Watanabe, Hisa-aki Shinkai, Yuta Michimura, S. Yamamoto, Katsuya Hashino, S. Ueki, Tomoya Kinugawa, J. Kim, A. Miyamoto, W. Morii, Y. Kataoka, Masatake Ohashi, Akito Araya, T. Furuhata, Tai Hyun Yoon, S. Kirii, T. Kaji, Satoshi Tsuchida, Kentaro Somiya, Sachiko Kuroyanagi, Naoki Seto, Nobutada Kimura, T. Kawasaki, Shinji Miyoki, Y. Sasaki, Naoko Ohishi, A. Suemasa, Takahiro Yamamoto, F. E. P. Arellano, T. Tomura, Nobuyuki Kanda, H. K. Tanaka, Masaki Ando, Shigeki Hirobayashi, S. Bae, M. Marchio, T. Ochi, T. Shimoda, M. Sasai, A. Yamamoto, Eiichi Hirose, Kouji Nakamura, Jun'ichi Yokoyama, H. Yuzurihara, Young-Min Kim, Yoichi Aso, Norichika Sago, Oh J. J., Y. K. Chu, M. H. P. M. van Putten, A. Shoda, Takashi Nakamura, Zong-Hong Zhu, C. Chen, Hideyuki Tagoshi, Y. Arai, T. Morozumi, Ting-Wai Chiu, Yasufumi Kojima, Rajesh Kumar, N. Sato, Chunglee Kim, Kimio Tsubono, Hyeseung Lee, C. P. Ooi, S. S. Pan, K. Miyo, K. Oohara, M. Kaneyama, M. Leonardi, Takayuki Tomaru, S. Saitou, Kazunari Eda, Takahiro Yamada, Koya Arai, Hiroki Takeda, T. Wakamatsu, Tomotada Akutsu, S. Tanioka, Kazuhiro Hayama, M. Nakano, Kohei Doi, Masako Kakizaki, Sadakazu Haino, K. Ueno, Yuichiro Sekiguchi, W. S. Kim, Norikatsu Mio, K. Izumi, Takamasa Suzuki, Seiji Kawamura, Haruki Kitazawa, Masa-Katsu Fujimoto, L. Naticchioni, T. Shishido, Naoki Aritomi, K. Yokogawa, E. Capocasa, Enzo Nicolas Tapia San Martin, Takashi Uchiyama, Kunihito Ioka, T. Uehara, T. Narikawa, Y. Moriwaki, Manami Sasaki, Ryutaro Takahashi, Keiko Kokeyama, Hyang Woon Lee, Koki Okutomi, Y. Obuchi, Jinsook Kim, T. Yokozawa, Y. Kitaoka, N. Kawai, Guo-Chin Liu, Takahiro Tanaka, W. Creus, Hideki Asada, Masaru Shibata, Shuhei Mano, Soichiro Morisaki, L. N. Quynh, S. Atsuta, C-Y. Lin, Takashi Sato, Koji Nagano, M. Kamiizumi, Shigeo Nagano, Kei Kotake, H. Vocca, F. Travasso, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), KAGRA, Laboratoire d'Annecy de Physique des Particules (LAPP), Akutsu, T., Ando, M., Arai, K., Arai, Y., Araki, S., Araya, A., Aritomi, N., Asada, H., Aso, Y., Atsuta, S., Awai, K., Bae, S., Baiotti, L., Barton, M. A., Cannon, K., Capocasa, E., Chen, C. -S., Chiu, T. -W., Cho, K., Chu, Y. -K., Craig, K., Creus, W., Doi, K., Eda, K., Enomoto, Y., Flaminio, R., Fujii, Y., Fujimoto, M. -K., Fukunaga, M., Fukushima, M., Furuhata, T., Haino, S., Hasegawa, K., Hashino, K., Hayama, K., Hirobayashi, S., Hirose, E., Hsieh, B. H., Huang, C. -Z., Ikenoue, B., Inoue, Y., Ioka, K., Itoh, Y., Izumi, K., Kaji, T., Kajita, T., Kakizaki, M., Kamiizumi, M., Kanbara, S., Kanda, N., Kanemura, S., Kaneyama, M., Kang, G., Kasuya, J., Kataoka, Y., Kawai, N., Kawamura, S., Kawasaki, T., Kim, C., Kim, J., Kim, J. C., Kim, W. S., Kim, Y. -M., Kimura, N., Kinugawa, T., Kirii, S., Kitaoka, Y., Kitazawa, H., Kojima, Y., Kokeyama, K., Komori, K., Kong, A. K. H., Kotake, K., Kozu, R., Kumar, R., Kuo, H. -S., Kuroyanagi, S., Lee, H. K., Lee, H. M., Lee, H. W., Leonardi, M., Lin, C. -Y., Lin, F. -L., Liu, G. C., Liu, Y., Majorana, E., Mano, S., Marchio, M., Matsui, T., Matsushima, F., Michimura, Y., Mio, N., Miyakawa, O., Miyamoto, A., Miyamoto, T., Miyo, K., Miyoki, S., Morii, W., Morisaki, S., Moriwaki, Y., Morozumi, T., Musha, M., Nagano, K., Nagano, S., Nakamura, K., Nakamura, T., Nakano, H., Nakano, M., Nakao, K., Narikawa, T., Naticchioni, L., Quynh, L. N., Ni, W. -T., Nishizawa, A., Obuchi, Y., Ochi, T., Oh, J. J., Oh, S. H., Ohashi, M., Ohishi, N., Ohkawa, M., Okutomi, K., Ono, K., Oohara, K., Ooi, C. P., Pan, S. -S., Park, J., Arellano, F. E. P., Pinto, I., Sago, N., Saijo, M., Saitou, S., Saito, Y., Sakai, K., Sakai, Y., Sasai, M., Sasaki, M., Sasaki, Y., Sato, S., Sato, N., Sato, T., Sekiguchi, Y., Seto, N., Shibata, M., Shimoda, T., Shinkai, H., Shishido, T., Shoda, A., Somiya, K., Son, E. J., Suemasa, A., Suzuki, T., Tagoshi, H., Tahara, H., Takahashi, H., Takahashi, R., Takamori, A., Takeda, H., Tanaka, H., Tanaka, K., Tanaka, T., Tanioka, S., Martin, E. N. T. S., Tatsumi, D., Tomaru, T., Tomura, T., Travasso, F., Tsubono, K., Tsuchida, S., Uchikata, N., Uchiyama, T., Uehara, T., Ueki, S., Ueno, K., Uraguchi, F., Ushiba, T., van Putten, M. H. P. M., Vocca, H., Wada, S., Wakamatsu, T., Watanabe, Y., Xu, W. -R., Yamada, T., Yamamoto, A., Yamamoto, K., Yamamoto, S., Yamamoto, T., Yokogawa, K., Yokoyama, J., Yokozawa, T., Yoon, T. H., Yoshioka, T., Yuzurihara, H., Zeidler, S., and Zhu, Z. -H.

Subjects
Physics - Instrumentation and Detectors, detector: cryogenics, 010504 meteorology & atmospheric sciences, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), detector: network, 7. Clean energy, 01 natural sciences, General Relativity and Quantum Cosmology, Laser interferometry, Einstein Telescope, temperature: low, 0103 physical sciences, LCGT, Interferometric gravitational wave detector, KAGRA, laser: interferometer, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], LIGO, mirror, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, detector: design, 0105 earth and related environmental sciences, Physics, COSMIC cancer database, Gravitational wave, Detector, gravitational radiation, Astronomy, Astronomy and Astrophysics, Gravitational Wave Detector, Instrumentation and Detectors (physics.ins-det), trigger, gravitational radiation detector, detector: sensitivity, VIRGO, [PHYS.GRQC]Physics [physics]/General Relativity and Quantum Cosmology [gr-qc], Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

著者人数: KAGRA collaboration 198名 (所属. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS): 和泉, 究), Number of authors: KAGRA collaboration 198 (Affiliation. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS): Izumi, Kiwamu), Accepted: 2018-11-19, 資料番号: SA1180423000

Published
2019
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