KAGRA -Large-scale Cryogenic Gravitational wave Telescope-

摘要

KAGRA is a second generation gravitational wave (GW) telescope under constructing in Japan. Features in KAGRA are underground site and cryogenic mirror systems. It is well studied that underground site of Mt. Ikenoyama in Kamioka has over two orders of magnitude smaller seismic vibration than that of typical urban area, and it is very effective to reduce seismic noise. The cryogenic mirror system is an unique technology developed in Japan to reduce mirror and suspension thermal noises in GW interferometer. These two unique features allow KAGRA to aim to detect GWs from neutron-star binary coalescence from 280 Mpc away in best direction. The details of these features and their status, including the status of the constructions site of KAGRA are reported in this paper.