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TAMA 300 is a ground-based gravitational-wave detector in Japan. Its basic design is similar to LIGO, a large Michelson interferometer, but with shorter (300 meter) arms. (LIGO's are 4 km and Virgo's and KAGRA's are 3 km, giving them more sensitivity.) It is one of a number of prototype GW detectors that Japan produced while developing the technology for KAGRA, and I believe it is still used to deploy new technologies and test them, but it is not sensitive enough to detect the clear GW detections that have so-far been observed by other detectors. GEO600 in Europe serves an analogous role.