CLIO

Detector for gravitational waves in Japan

Location of CLIO

[edit on Wikidata]

CLIO is the Cryogenic Laser Interferometer Observatory, a prototype detector for gravitational waves. It is testing cryogenic mirror technologies for the Kamioka Gravitational Wave Detector (KAGRA). It is located in Japan.

Overview

CLIO is an optical interferometer with two perpendicular arms each of 100 m length. The mirrors are cooled to 20 K (−253 °C); this reduces various thermal noise sources which trouble other gravity observatories, but cooling the mirrors (which are heated by the powerful laser used in the interferometer) while keeping them isolated from vibrations is difficult.^[1]

CLIO is situated 1000 m underground in the Kamioka Observatory, Gifu Prefecture.^[2]

CLIO is one of the science facilities for physics of the Institute for Cosmic Ray Research of the University of Tokyo.

References

^ K. Yamamoto; et al. (2008). "Current status of the CLIO project". Journal of Physics: Conference Series. 122 (1): 012002. arXiv:0805.2384. Bibcode:2008JPhCS.122a2002Y. doi:10.1088/1742-6596/122/1/012002. S2CID 14580628.
^ T. Uchiyama; et al. (2006). "Cryogenic systems of the Cryogenic Laser Interferometer Observatory". Journal of Physics: Conference Series. 32 (1): 259–264. Bibcode:2006JPhCS..32..259U. doi:10.1088/1742-6596/32/1/038.

Gravitational-wave astronomy

Gravitational wave
Gravitational-wave observatory

Detectors

Resonant mass
antennas

Active	NAUTILUS (IGEC) AURIGA (IGEC) MiniGRAIL Mario Schenberg
Past	EXPLORER (IGEC) ALLEGRO (IGEC) NIOBE (IGEC) Stanford gravitational wave detector ALTAIR GEOGRAV AGATA Weber bar
Proposed	TOBA
Past proposals	GRAIL (downsized to MiniGRAIL) TIGA SFERA Graviton (downsized to Mario Schenberg)

Ground-based
Interferometers

Active	AIGO (ACIGA) CLIO Fermilab holometer GEO600 Advanced LIGO (LIGO Scientific Collaboration) KAGRA Advanced Virgo (European Gravitational Observatory)
Past	TAMA 300 TAMA 20, later known as LISM TENKO-100 Caltech 40m interferometer
Planned	INDIGO (LIGO-India)
Proposed	Cosmic Explorer Einstein Telescope
Past proposals	LIGO-Australia

Space-based
interferometers

Planned	LISA
Proposed	Big Bang Observer DECIGO TianQin

Pulsar timing arrays

Data analysis

Observations

Events	List of observations First observation (GW150914) GW151226 GW170104 GW170608 GW170814 GW170817 (first neutron star merger) GW190412 GW190521 (first-ever possible light from bh-bh merger) GW190814 (first-ever "mass gap" collision) GW200105 (first black hole - neutron star merger)
Methods	Direct detection Laser interferometers Resonant mass detectors Proposed: Atom interferometers Indirect detection B-modes of CMB Pulsar timing array Binary pulsar