We report on the current status of CLIO (Cryogenic Laser Interferometer Observatory), which is a prototype interferometer for LCGT (Large Scale Cryogenic Gravitational-Wave Telescope). LCGT is a Japanese next-generation interferometric gravitational wave detector featuring the use of cryogenic mirrors and a quiet underground site. The main purpose of CLIO is to demonstrate a reduction of the mirror thermal noise by cooling the sapphire mirrors. CLIO is located in an underground site of the Kamioka mine, 1000 m deep from the mountain top, to verify its advantages. After a few years of commissioning work, we have achieved a thermal-noise-limited sensitivity at room temperature. One of the main results of noise hunting was the elimination of thermal noise caused by a conductive coil-holder coupled with a pendulum through magnets.
@article{arxiv.0911.3090,
title = {Thermal-noise-limited underground interferometer CLIO},
author = {Kazuhiro Agatsuma and Koji Arai and Masa-Katsu Fujimoto and Seiji Kawamura and Kazuaki Kuroda and Osamu Miyakawa and Shinji Miyoki and Masatake Ohashi and Toshikazu Suzuki and Ryutaro Takahashi and Daisuke Tatsumi and Souichi Telada and Takashi Uchiyama and Kazuhiro Yamamoto and CLIO collaborators},
journal= {arXiv preprint arXiv:0911.3090},
year = {2014}
}
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10 pages, 6 figures, Proceedings of the 8th Edoardo Amaldi Conference on Gravitational Waves