Design and construction status of CLIO

Kuroda, K.; Miyoki, S.; Uchiyama, Takashi; Yamamoto, Kohei; Kasahara, K.; Shintomi, T.; Yamamoto, A.; Haruyama, T.; Saitō, Yoshio; Higashi, Y.; Suzuki, Toshikazu; Sato, Nobuaki; Tomaru, T.; Tatsumi, Daisuke; Telada, S.; Ando, Masaki; Araya, Akito; Takemoto, Shuzo; Higashi, Tomohito; Momose, H; Akamatsu, Junpei; Morii, Wataru

doi:10.1088/0264-9381/20/17/303

Cited by 34 publications

(26 citation statements)

References 11 publications

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“…CLIO will improve the performance of the cryogenic laser interferometer for the LCGT (Ohashi et al, 2003). In parallel with the CLIO equipment, we have been installing a laser strainmeter system for geophysical purposes.…”

Section: Introductionmentioning

confidence: 99%

A 100m laser strainmeter system installed in a 1km deep tunnel at Kamioka, Gifu, Japan

Takemoto

Araya

Akamatsu

et al. 2004

Journal of Geodynamics

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Section: Introductionmentioning

confidence: 99%

A 100m laser strainmeter system installed in a 1km deep tunnel at Kamioka, Gifu, Japan

Takemoto

Araya

Akamatsu

et al. 2004

Journal of Geodynamics

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“…There are a number of scientific facilities, such as the neutrino detectors Super-Kamiokande and KamLAND, located in Kamioka mine [19,20]. Another facility is gravitational wave detector CLIO, which is an L-shaped laser interferometer located 1000 m underground, whose baseline length is 100 m [21,22]. Geophysical laser strainmeters with a baseline length of 100 m are located along CLIO [11].…”

Section: Observation At a Deep Underground Site In Kamiokamentioning

confidence: 99%

Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air

2014

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Abstract:A highly accurate two-color interferometer with automatic correction of the refractive index of air was developed for crustal strain observation. The two-color interferometer, which can measure a geometrical distance of approximately 70 m, with a relative resolution of 2 × 10 −9 , clearly detected a change in strain due to earth tides in spite of optical measurement in air. Moreover, a large strain quake due to an earthquake could be observed without disturbing the measurement. We demonstrated the advantages of the two-color interferometer in air for geodetic observation.

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“…28) 4.1.2. LCGT tunnel and research building A 3 km × 3 km long tunnel will be dug, which will lie inside a mountain 1300 m high above sea level.…”

Section: Work With International Detectorsmentioning

confidence: 99%

Experimental Efforts to Detect Gravitational Waves

Kuroda

Kanda

Saitō

et al. 2006

Prog. Theor. Phys. Suppl.

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A remarkable design of LCGT was established by experimental efforts to detect gravitational waves in Japan including optional alternatives in design detail. The LCGT adopts an advanced technique regarded to be used in the third generation. We can reliably detect gravitational waves by LCGT and still have a chance to firstly detect it. * ) Earth GEO600 Germany-Britain Hannover German at RMIT Central Library on July 6, 2015 http://ptps.oxfordjournals.org/ Downloaded from 56 K. Kuroda et al.revised so as to consider technical developments and the experience obtained in a series of data-taking runs by TAMA. Remarkable feature of LCGTLCGT is designed to ultimately increase the sensitivity of a Fabry-Perot Michelson interferometer using existing technologies. Cryogenic mirrors are adopted for the main cavities of the interferometer to reduce thermal vibration noise. In place of synthetic silica, sapphire crystal has to be used for the mirror substrate. Since sapphire has much higher optical loss, 8) we have applied the technique of the resonant sideband extraction (RSE) 9) scheme with a relatively low-power recycling gain in order to reduce a problem arising from the higher optical loss inside the input mirror of Fabry-Perot cavity. The other item that characterizes LCGT is the suspension point interferometer (SPI), 10) which makes ease the design of both the mirror actuation system and the vibration isolation system in the cryostat, since it reduces the mechanical noise inevitably introduced by cooling heat links connected from the mirror suspension system to the inner radiation shield of the cryostat. The SPI is described in §7.The data collected by TAMA was usually contaminated by non-Gaussian noise, and many fake events resulted. 11) To reduce these fake events, two interferometers are installed in the same vacuum system, which is a change of the previous revised design. 12), 13) From the report of LIGO, Hanford, the cross talk of two interferometers in the same vacuum tube was not seriously large. Even if there is some correlation between the two interferometers in LCGT, the simulated rejection ratio about the known wave-form signal is practically high enough as described in §3. Therefore, the choice of two interferometers gives us profound benefit for reliable detection of gravitational waves.The optical design of LCGT is shown in Fig. 2. It is a power recycled Fabry-Perot Michelson interferometer with RSE method. The output of the laser source is fed through two stages of mode cleaners into the main interferometer. The optical features of LCGT are described in §5 in detail.The cryogenic mirror allows us to design the sensitivity of the interferometer, limited only by quantum noises: shot noise and pressure noise of the photon recoil force. If we can establish this quantum-limited sensitivity, the sensitivity of the observational band is altered only by the signal bandwidth and the optical power in the cavity. By optimizing these two parameters, we can increase the detectable distance of the gravitational wave e...

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Design and construction status of CLIO

Cited by 34 publications

References 11 publications

A 100m laser strainmeter system installed in a 1km deep tunnel at Kamioka, Gifu, Japan

A 100m laser strainmeter system installed in a 1km deep tunnel at Kamioka, Gifu, Japan

Crustal Strain Observation Using a Two-Color Interferometer with Accurate Correction of Refractive Index of Air

Experimental Efforts to Detect Gravitational Waves

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