Thermal-noise-limited underground interferometer CLIO

Abstract

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.

10 pages, 6 figures, Proceedings of the 8th Edoardo Amaldi Conference on Gravitational Waves

References in corpus (2)

• Current status of the CLIO project
• Direct Measurement of Thermal Fluctuation of High-Q Pendulum

Cited by in corpus (6)

• Gravitational Waves: Sources, Detectors and Searches
• Multimessenger astronomy with gravitational waves and high-energy neutrinos
• Reduction of thermal fluctuations in a cryogenic laser interferometric gravitational wave detector
• A brief history of gravitational wave research
• Compact integrated optical sensors and electromagnetic actuators for vibration isolation systems in the gravitational-wave detector KAGRA
• Tests of cryogenic Fabry-Perot cavity with mirrors on different substrates