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KAGRA NEWS |
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KAGRA (Large Cryogenic Gravitational Wave Telescope) Project is
jointly promoted by Institute for Cosmic Ray Research (ICRR, the main
host), National Astronomical Observatory of Japan (NAOJ), High Energy
Accelerator Research Organization (KEK) and other member institutes as
an international collaboration.
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December 05, 2013 The Y-arm tunnel went all the way! |
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One of two KAGRA tunnels, which are under constructing in the Kamioka mine (Hida, Gifu),
went all the way around 14:30 on the 5th in December, 2013. |
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KAGRA is only one underground gravitational wave telescope which has two arms
with the 3-km vacuum pipe. To evacuate 6-km tunnel in total, the construction
work started in May of 2012 at the 200-m underground of Mt. Ikenoyama in Kamioka. The tunnel bored in this time is the Y-arm going to north-north-west from the Atotsu entrance which is located at the cross point of the X-arm and the Y-arm. The tunnel has been evacuated from both the Atotsu entrance and the Mozumi entrance which is located at the end of the arm. The penetration point was 1,754-m far from the Atotsu entrance. The X-arm is still under evacuating from the Atotsu entrance, and now 3/4 of the 3-km arm was finished. |
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KAGRA Project (presented by ICRR) |
The construction work is going continuously toward the first detection of gravitational waves. The evacuation will be completed within this fiscal year. The first operation and the observation runs are planed in 2015 and 2017-2018 respectively. |
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Moment of the blasting (presented by ICRR) |
Movie of Moment of ignition to a dynamite (presented by ICRR, NAOJ) |
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Added: December 20, 2013 KAJIMA Corp. announced that its new NATM method achieved a domestic record high, 359m per month, in September, 2013 in the tunnel construction work for KAGRA. →→KAJIMA Corporation's Press release (Japanese) |