2004
DOI: 10.1088/0264-9381/21/5/115
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Present status of large-scale cryogenic gravitational wave telescope

Abstract: The large-scale cryogenic gravitational wave telescope (LCGT) is the future project of the Japanese gravitational wave group. Two sets of 3 km arm length laser interferometric gravitational wave detectors will be built in a tunnel of Kamioka mine in Japan. LCGT will detect chirp waves from binary neutron star coalescence at 240 Mpc away with a S/N of 10. The expected number of detectable events in a year is two or three. To achieve the required sensitivity, several advanced techniques will be employed such as … Show more

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Cited by 44 publications
(28 citation statements)
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“…It is well known that underground sites are seismically quieter (i.e. see [51]) and the possibility of realizing an underground GW detector has been analyzed and selected by the LCGT [52] (Large Scale Cryogenic GW Telescope) collaboration in Japan. The comparison between the seismic noise in the TAMA [53] site (Tokyo) and in the LISM [54] site (Kamioka mine, the prime candidate as an LCGT site) shows a reduction in the low-frequency region, by going underground, by a factor of 100 in terms of acceleration and by two to three orders of magnitude in displacement spectral amplitude.…”
Section: Seismic Noise Filteringmentioning
confidence: 99%
See 1 more Smart Citation
“…It is well known that underground sites are seismically quieter (i.e. see [51]) and the possibility of realizing an underground GW detector has been analyzed and selected by the LCGT [52] (Large Scale Cryogenic GW Telescope) collaboration in Japan. The comparison between the seismic noise in the TAMA [53] site (Tokyo) and in the LISM [54] site (Kamioka mine, the prime candidate as an LCGT site) shows a reduction in the low-frequency region, by going underground, by a factor of 100 in terms of acceleration and by two to three orders of magnitude in displacement spectral amplitude.…”
Section: Seismic Noise Filteringmentioning
confidence: 99%
“…Currently there are two candidate materials for this role: sapphire and silicon. Sapphire has been selected to realize the suspension fibers of LCGT [52] both for its dissipation [73] and for its thermal conductivity properties [74]; silicon, on the other hand, has been preliminarily studied within the ILIAS project and it has been found suitable to realize both suspension fibers [75] and ribbons [76]. However, it is the matter of fact that currently only sapphire has been used to realize a full cryogenic suspension and the usage of silicon still needs a successful R&D activity.…”
Section: Suspension Thermal Noisementioning
confidence: 99%
“…Parameter measurement of signals using the Q-pipeline. The left plot shows the measured frequency of the gravitational-wave candidate versus the injected ringdown frequency f ring computed by equation (12). The right plot shows the difference between Q-pipeline measured frequency and f ring , against the total mass of the injection.…”
Section: Q-pipelinementioning
confidence: 99%
“…Using the latest SGWB measurement with LIGO detectors [15], we apply this formalism to produce the first constraints on parity violation for a generic power-law SGWB spectrum. We also estimate the sensitivity of the upcoming second-generation GW detectors to the power-law and axion-inflation parity violating models-Advanced LIGO (aLIGO) [28] detectors at Hanford, WA (H1) and Livingston, LA (L1), Advanced Virgo [29] in Italy (V1), GEO-HF [30] in Germany, and KAGRA [31,32] in Japan (K1) are expected to have ∼ 10× better strain sensitivities than the firstgeneration detectors, and to produce first science-quality data in 2015. Finally, we consider an example configuration of a pair of third-generation GW detectors, with strain sensitivity similar to the proposed Einstein Telescope [33].…”
Section: Pacs Numbersmentioning
confidence: 99%