Kamioka-Branch, GWPO, ICRR, UT
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In 1999, a 20m Laser Interferometer of NAOJ was reconstructed in the kamioka site
In 1999, a 20m Fabry-Perot Michelson type laser interferometer in NAOJ was moved in the Kamioka mine for the new research entitled "Research about MACHO black hole coalescences by gravitational wave observation (Leader: Prof. Totsuka)", which was supported by KAKEN - A. Main purposes for this research are to show the merits of the underground low seismic noise environment for laser interferometer type GW telescope and to verify whether MACHOs do exist or not by gravitational wave observation from these MACHO coalescences in our galaxy. The initial contributers for this research is Ohashi(ICRR), Miyoki(ICRR), Sato(Hosei), Telada(AIST), Tatsumi(NAOJ), Fukushima(NAOJ) for reconstruction and commissioning, and Tagoshi(Osaka U), Takahashi(Nagaoka TU) for the data anakysis. Because this research was the first experiment for the GW group in the Kamioka mine, we were kindly supported by many members of Super-Kamiokande and the Kamioka mine company.
This 20m Fabry-Perot Michelson Type Laser Interferometer was named LISM. The following items are the summary of LISM achievements.
ĦThe longest continuous operation time. (at the time)
ĦThe best strain and displacement sensitivity for the low frequency range.
ĦThe first simultaneous GW observation with TAMA300 and veto analysis using two independent data.
