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Your search keyword '"Kuniharu Tochikubo"' showing total 6 results
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6 results on '"Kuniharu Tochikubo"'

1. Development of a multistage laser frequency stabilization for an interferometric gravitational-wave detector

Author

Akitoshi Ueda, Takashi Nakamura, Nobuki Kawashima, Masaki Ando, Shigeo Nagano, Ken'ichi Nakagawa, Koji Arai, Kozo Ueda, Norihiko Kamikubota, Masatake Ohashi, Akito Araya, Daisuke Tatsumi, Eiichi Mizuno, Nobuyuki Kanda, Atsushi Sekiya, Shigenori Moriwaki, Shinji Miyoki, Kuniharu Tochikubo, Mitsuru Musha, Ryutaro Takahashi, Takahiro Tanaka, Ken-ichi Ueda, Norikatsu Mio, Sumihiro Matsumura, Kazuaki Kuroda, N. Ohishi, Shuichi Sato, Misao Sasaki, Shoken M. Miyama, M. A. Barton, Nobuhiro Tsuda, Toshitaka Yamazaki, Hideki Ishizuka, Koichi Waseda, Takayuki Tomaru, Hideki Asada, Ken-ichi Oohara, Masaru Shibata, Osamu Miyakawa, Gen'ichi Horikoshi, Yujiro Ogawa, Akiteru Takamori, Kazuhiro Yamamoto, Yoshihide Kozai, Hideyuki Tagoshi, Shigemi Otsuka, Mitsuhiro Fukushima, Toshikazu Suzuki, Yasufumi Kojima, Keita Kawabe, Toshifumi Futamase, Ken-ichi Nakao, Shinsuke Taniguchi, Namio Matsuda, Seiji Kawamura, Takashi Uchiyama, Masa-Katsu Fujimoto, Kimio Tsubono, Yoshio Saito, and Souichi Telada

Subjects
Physics, Coupling, Interferometry, Optics, business.industry, Detector, Astronomical interferometer, Topology (electrical circuits), Interferometric gravitational wave detector, business, Instrumentation, Sensitivity (electronics), TAMA 300
Abstract

Laser frequency stabilization is essential for interferometric gravitational-wave detectors to attain their target sensitivity. We have designed a multistage laser frequency stabilization system which has been applied in the development of the TAMA 300 gravitational-wave detector in Japan. The control topology consisting of two cascaded loops were employed to secure high feedback gain and reliable detector operation and thus allow the best frequency stability and uninterrupted long-term observation. We achieved simultaneously a frequency stability of 5 × 10^(−5) Hz/√HZ , and a common-mode rejection ratio (which reduces the coupling of frequency noise to spurious signals in the detector) of 37 dB. The developed system enabled us to operate TAMA 300 with sufficient sensitivity and stability that it had the potential to register gravitational-wave events. The system was confirmed to be suitable for a gravitational-wave detector from the observation run of TAMA 300.

Published
2003

2. Development of a light source with an injection-locked Nd:YAG laser and a ring-mode cleaner for the TAMA 300 gravitational-wave detector

Author

Akito Araya, Hideki Ishizuka, Mitsuru Musha, Takahiro Tanaka, Akitoshi Ueda, Namio Matsuda, Mitsuhiro Fukushima, K. Oohara, Nobuki Kawashima, Daisuke Tatsumi, Shigeo Nagano, Shinji Miyoki, Koji Arai, Seiji Kawamura, Takashi Nakamura, Gen'ichi Horikoshi, Kuniharu Tochikubo, Masaki Ando, Nobuhiro Tsuda, Kazuaki Kuroda, Masa Katsu Fujimoto, Nobuyuki Kanda, Misao Sasaki, Norihiko Kamikubota, M. A. Barton, Takayuki Tomaru, Toshikazu Suzuki, Masatake Ohashi, Takashi Uchiyama, Kimio Tsubono, Yoshio Saito, Shigenori Moriwaki, Yasufumi Kojima, Yujiro Ogawa, Akiteru Takamori, Kazuhiro Yamamoto, N. Ohishi, Ken-ichi Ueda, Souichi Telada, Ken'ichi Nakagawa, Ryutaro Takahashi, Sumihiro Matsumura, Osamu Miyakawa, Keita Kawabe, Yoshihide Kozai, Hideyuki Tagoshi, Toshitaka Yamazaki, Toshifumi Futamase, Eiichi Mizuno, Norikatsu Mio, Shinsuke Taniguchi, Shuichi Sato, and Shoken M. Miyama

Subjects
Physics, Gravitational-wave observatory, business.industry, Linear polarization, Detector, Laser, TAMA 300, law.invention, Interferometry, Optics, law, Nd:YAG laser, Optoelectronics, business, Instrumentation, Noise (radio)
Abstract

We have developed a light source suitable for laser interferometric gravitational-wave detectors. The developed light source has high power, TEM00 mode, linear polarization, high frequency stability, and low intensity noise. The light source with the quality is essential for attaining the goal sensitivity in the TAMA 300 and was found to be available for a observation run of a gravitational-wave detector.

Published
2002

3. Stable Operation of a 300-m Laser Interferometer with Sufficient Sensitivity to Detect Gravitational-Wave Events within Our Galaxy

Author

Kimio Tsubono, Yoshio Saito, Akito Araya, Toshitaka Yamazaki, Souichi Telada, Osamu Miyakawa, Yasufumi Kojima, Hiromi Yakura, Kazuaki Kuroda, Akitoshi Ueda, Seiji Kawamura, Takashi Uchiyama, K. Oohara, Youich Aso, Shigemi Otsuka, Koichi Waseda, Kazuhiro Kondo, Ken-ichi Nakao, Nobuhiro Tsuda, Toshikazu Suzuki, Namio Matsuda, Yuko Watanabe, Yoshinori Kobayashi, Kuniharu Tochikubo, Satoshi Okutomi, Ken'ichi Nakagawa, Hideki Ishizuka, Yujiro Ogawa, Akiteru Takamori, Takahiro Tanaka, Norihiko Kamikubota, Kazuhiro Yamamoto, Ryutaro Takahashi, Daisuke Tatsumi, Naoko Ohishi, Hideki Asada, Yoshihide Kozai, Hideyuki Tagoshi, Masaki Ando, Mitsuru Musha, Takashi Nakamura, Norikatsu Mio, Shigeo Nagano, Keita Kawabe, Kazuyuki Miura, Masaru Shibata, Masa Katsu Fujimoto, Shuichi Sato, Mitsuhiro Fukushima, Shoken M. Miyama, Gen'ichi Horikoshi, Takayuki Tomaru, M. Ohashi, Nobuki Kawashima, Kentaro Somiya, Kenji Numata, Kazuhiro Hayama, Shigenori Moriwaki, Ken-ichi Ueda, Nobuyuki Kanda, Toshifumi Futamase, Atsushi Sekiya, Shinji Miyoki, Misao Sasaki, Koji Arai, M. A. Barton, Shinsuke Taniguchi, and Gerhard Heinzel

Subjects
Physics, Gravitational wave, Astronomy, Lasers, Astrophysics (astro-ph), Detector, FOS: Physical sciences, General Physics and Astronomy, Binary number, General Relativity and Quantum Cosmology (gr-qc), Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Laser, Sensitivity and Specificity, General Relativity and Quantum Cosmology, Galaxy, law.invention, Interferometry, Neutron star, law, Interferometric gravitational wave detector, Astrophysics::Galaxy Astrophysics, Gravitation
Abstract

TAMA300, an interferometric gravitational-wave detector with 300-m baseline length, has been developed and operated with sufficient sensitivity to detect gravitational-wave events within our galaxy and sufficient stability for observations; the interferometer was operated for over 10 hours stably and continuously. With a strain-equivalent noise level of $h\sim 5 \times 10^{-21} /\sqrt{\rm Hz}$, a signal-to-noise ratio (SNR) of 30 is expected for gravitational waves generated by a coalescence of 1.4 $M_\odot$-1.4 $M_\odot$ binary neutron stars at 10 kpc distance. %In addition, almost all noise sources which limit the sensitivity and which %disturb the stable operation have been identified. We evaluated the stability of the detector sensitivity with a 2-week data-taking run, collecting 160 hours of data to be analyzed in the search for gravitational waves., 5 pages, 4 figures

Published
2001

4. Results of the search for inspiraling compact star binaries from TAMA300's observation in 2000–2004

Author

M. A. Barton, Toshifumi Futamase, Tatsuru Yoshida, Fumihiko Usui, Shinsuke Taniguchi, Ryuichi Fujita, Y. Tsunesada, Toshikazu Suzuki, Hisa-aki Shinkai, Kuniharu Tochikubo, Norikatsu Mio, Kazuhiro Yamamoto, C. T. Taylor, Keiko Kokeyama, Mayu Katsuki, Shinji Miyoki, Shihori Sakata, T. Akutsu, Hiromi Mizusawa, Ken-ichi Nakao, Seiji Kawamura, Kouichi Sato, Taketoshi Kasai, Kazuaki Kuroda, Akitoshi Ueda, Y. Aso, Takaharu Kaneyama, Shigeo Nagano, Naoki Seto, Yuko Watanabe, Misao Sasaki, Tomotada Akutsu, Namio Matsuda, Nobuaki Sato, Yoshihide Kozai, Hideyuki Tagoshi, Akiteru Takamori, Osamu Miyakawa, Kunihiko Kasahara, Takashi Kuwabara, Yoshikazu Karasawa, Nobuyuki Kanda, Youhei Sato, P. T. Beyersdorf, Takashi Nakamura, Yukiyoshi Iida, Shigenori Moriwaki, Yuriko Yanagi, Kenji Soida, Shigemi Otsuka, Zong Hong Zhu, Takayuki Tomaru, Masa Katsu Fujimoto, Takakazu Shintomi, Hideaki Hayakawa, Ken-ichi Ueda, Aya Sekido, Norihiko Kamikubota, Masatake Ohashi, Hiroyuki Nakano, Yusaku Hamuro, Hidetsugu Seki, Fumiko Kawazoe, Yoshitaka Nagayama, Tatsuo Yoda, Toshitaka Yamazaki, Naoko Ohishi, Toru Tanji, Norichika Sago, Hideo Iguchi, Ryutaro Takahashi, Takashi Uchiyama, Kunihito Ioka, Hiromi Yakura, Tomiyoshi Haruyama, Kohei Takeno, Mari Kawamura, Hirotaka Takahashi, Keisuke Taniguchi, Koji Arai, Akira Okutomi, Hideaki Kudoh, Mitsuhiro Fukushima, Hideki Ishitsuka, Hideki Asada, Daisuke Tatsumi, Masaru Shibata, Takahiro Tanaka, Gen'ichi Horikoshi, Jun'ichi Yokoyama, Yasufumi Kojima, Yujiro Ogawa, K. Kawabe, Shuzo Takemoto, Kimio Tsubono, Yoshio Saito, Gerhard Heinzel, Koichi Waseda, Souichi Telada, Kazuhiro Kondo, Masao Tokunari, Ken'ichi Nakagawa, Kazuhiro Hayama, Youhei Fujiki, Nobuki Kawashima, Kazuyuki Miura, Nobuhiro Tsuda, Shuichi Sato, Kentaro Somiya, Shoken M. Miyama, Kenji Numata, Masaki Ando, Akira Yamamoto, Yuhiko Nishi, Mitsuru Musha, Akito Araya, and K. Oohara

Subjects
Physics, Nuclear and High Energy Physics, Stellar mass, Gravitational wave, Astrophysics (astro-ph), Binary number, Astronomy, FOS: Physical sciences, Astrophysics, General Relativity and Quantum Cosmology (gr-qc), Compact star, Cosmology, Galaxy, General Relativity and Quantum Cosmology, binary stars, Stars, gravitational wave detectors, Binary star, stellar mass
Abstract

We analyze the data of TAMA300 detector to search for gravitational waves from inspiraling compact star binaries with masses of the component stars in the range 1-3Msolar. In this analysis, 2705 hours of data, taken during the years 2000-2004, are used for the event search. We combine the results of different observation runs, and obtained a single upper limit on the rate of the coalescence of compact binaries in our Galaxy of 20 per year at a 90% confidence level. In this upper limit, the effect of various systematic errors such like the uncertainty of the background estimation and the calibration of the detector's sensitivity are included., Comment: 8 pages, 4 Postscript figures, uses revtex4.sty The author list was corrected

Published
2006

5. First search for gravitational waves from inspiraling compact binaries using TAMA300 data

Author

Ryutaro Takahashi, Daisuke Tatsumi, Yoshio Saito, Souichi Telada, Mitsuru Musha, Akitoshi Ueda, Shigeo Nagano, Seiji Kawamura, Shoken M. Miyama, Yuko Watanabe, Shigemi Otsuka, M. A. Barton, Osamu Miyakawa, Koji Arai, Nobuki Kawashima, Shuichi Sato, Takashi Nakamura, Yujiro Ogawa, A. Araya, Gerhard Heinzel, Ken-ichi Nakao, Kentaro Somiya, Masa Katsu Fujimoto, Koichi Waseda, Takayuki Tomaru, Akira Okutomi, Namio Matsuda, Kenji Numata, Masaki Ando, Hideki Asada, Yoshihide Kozai, Hideyuki Tagoshi, Ke N.Ichi Nakagawa, Kimio Tsubono, Atsushi Sekiya, Takashi Uchiyama, Eiichi Mizuno, Shigenori Moriwaki, K. Oohara, Shinji Miyoki, Takahiro Tanaka, Keita Kawabe, Hiromi Yakura, M. Fukushima, Ken-ichi Ueda, N. Ohishi, Ge N.Ichi Horikoshi, A. Takamori, Sumihiro Matsumura, Norihiko Kamikubota, Masaru Shibata, Toshikazu Suzuki, Kozo Ueda, Misao Sasaki, Kazuhiro Yamamoto, Kazuaki Kuroda, Nobuhiro Tsuda, Nobuyuki Kanda, Norikatsu Mio, Kuniharu Tochikubo, Yasufumi Kojima, M. Ohashi, Satoshi Miki, Hideki Ishizuka, Toshifumi Futamase, T. Yamazaki, Shinsuke Taniguchi, and Kazumichi Shirakata

Subjects
Physics, Nuclear and High Energy Physics, Gravitational-wave observatory, Gravitational wave, media_common.quotation_subject, Detector, Astrophysics (astro-ph), Astronomy, Binary number, FOS: Physical sciences, Astrophysics, General Relativity and Quantum Cosmology (gr-qc), General Relativity and Quantum Cosmology, Position (vector), Sky, Event (particle physics), Gravitational redshift, media_common
Abstract

We analyzed 6 hours of data from the TAMA300 detector by matched filtering, searching for gravitational waves from inspiraling compact binaries. We incorporated a two-step hierarchical search strategy in matched filtering. We obtained an upper limit of 0.59/hour (C.L.=90%) on the event rate of inspirals of compact binaries with mass between 0.3M_solar and 10M_solar and with signal-to-noise ratio greater than 7.2. The distance of 1.4M_solar (0.5M_solar) binaries which produce the signal-to-noise ratio 7.2 was estimated to be 6.2kpc (2.9kpc) when the position of the source on the sky and the inclination angle of the binaries were optimal., Comment: 5 pages, 4 figures. To appear Phsical Review D

Published
2001

6. Absolute-length determination of a long-baseline Fabry–Perot cavity by means of resonating modulation sidebands

Author

Souichi Telada, Yutaka Naito, Akito Araya, Daisuke Tatsumi, Seiji Kawamura, Shinji Miyoki, Masa-Katsu Fujimoto, K. Kawabe, Shigenori Moriwaki, Mitsuru Musha, Toshitaka Yamazaki, Norikatsu Mio, Shinsuke Taniguchi, Kuniharu Tochikubo, Kazuo Horikoshi, Shigeo Nagano, Akiteru Takamori, Kazuhiro Yamamoto, and Ryutaro Takahashi

Subjects
Physics, Gravitational-wave observatory, Physics::Instrumentation and Detectors, business.industry, Materials Science (miscellaneous), Astrophysics::Instrumentation and Methods for Astrophysics, Physics::Optics, Industrial and Manufacturing Engineering, Interferometry, Optics, Modulation, Physics::Accelerator Physics, Business and International Management, business, Frequency modulation, Phase modulation, Refractive index, Fabry–Pérot interferometer, Free spectral range
Abstract

A new method has been demonstrated for absolute-length measurements of a long-baseline Fabry–Perot cavity by use of phase-modulated light. This method is based on determination of a free spectral range (FSR) of the cavity from the frequency difference between a carrier and phase-modulation sidebands, both of which resonate in the cavity. Sensitive response of the Fabry–Perot cavity near resonant frequencies ensures accurate determination of the FSR and thus of the absolute length of the cavity. This method was applied to a 300-m Fabry–Perot cavity of the TAMA gravitational wave detector that is being developed at the National Astronomical Observatory, Tokyo. With a modulation frequency of ∼12 MHz, we successfully determined the absolute cavity length with resolution of 1 µm (3 × 10-9 in strain) and observed local ground strain variations of 6 × 10-8.

Published
1999

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