CLIO is the Cryogenic Laser Interferometer Observatory, a prototype detector for gravitational waves. It is testing cryogenic mirror technologies for the future Large Cryogenic Gravity Telescope (LCGT).
It is an optical interferometer with two perpendicular arms 100 m long. Uniquely, the mirrors are cooled to 20 K. This reduces various thermal noise sources which trouble other gravity observatories, but cooling the mirrors (which is heated by the powerful laser used in the interferometer) while keeping them isolated from vibrations is difficult.
CLIO is one of the science facilities for physics of the Institute for Cosmic Ray Research of the University of Tokyo.
- K. Yamamoto et al. (2008). "Current status of the CLIO project". Journal of Physics: Conference Series 122: 012002. arXiv:0805.2384. Bibcode:2008JPhCS.122a2002Y. doi:10.1088/1742-6596/122/1/012002.
- T. Uchiyama et al. (2006). "Cryogenic systems of the Cryogenic Laser Interferometer Observatory". Journal of Physics: Conference Series 32: 259. Bibcode:2006JPhCS..32..259U. doi:10.1088/1742-6596/32/1/038.