{"id":8171,"date":"2013-12-15T00:00:00","date_gmt":"2013-12-14T15:00:00","guid":{"rendered":"https:\/\/www.icrr.u-tokyo.ac.jp\/?post_type=news&#038;p=8171"},"modified":"2020-01-21T14:40:15","modified_gmt":"2020-01-21T05:40:15","slug":"%e9%87%8d%e5%8a%9b%e6%b3%a2%e6%9c%9b%e9%81%a0%e9%8f%a1kagra%e3%81%aey%e3%82%a2%e3%83%bc%e3%83%a0%e3%81%8c%e8%b2%ab%e9%80%9a%e3%81%97%e3%81%be%e3%81%97%e3%81%9f-2","status":"publish","type":"news","link":"https:\/\/www.icrr.u-tokyo.ac.jp\/en\/news\/8171\/","title":{"rendered":"KAGRA&#8217;s Y-arm tunnel now complete"},"content":{"rendered":"\n<p><strong>Postscript on 2nd of January, 2014<\/strong><\/p>\n\n\n\n<p>Movie for completion of Y-Arm tunnel of KAGRA<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"\u5927\u578b\u4f4e\u6e29\u91cd\u529b\u6ce2\u671b\u9060\u93e1KAGRA\u306eY\u30a2\u30fc\u30e0\u30c8\u30f3\u30cd\u30eb\u304c\u8cab\u901a\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/tMjYdqI7G9o?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><strong>Original Article<\/strong><\/p>\n\n\n\n<p>On December 5, 2013, the team of the Large-Scale Cryogenic Gravitational Wave Telescope, KAGRA, currently under construction 200-meter below the surface of Mt. Ikenoyama in Kamioka, completed the construction of one of the two 3-kilometer tunnels. The workers blasted open approximately halfway of the Y-arm tunnel at 14:30.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"375\" src=\"\/prwps\/wp-content\/uploads\/2019\/06\/20131206kagra1.jpg\" alt=\"\" class=\"wp-image-2751\" srcset=\"https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/06\/20131206kagra1.jpg 500w, https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/06\/20131206kagra1-300x225.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption>The KAGRA team members pose for a photo after the successful blasting of KAGRA&#8217;s Y-arm tunnel<\/figcaption><\/figure>\n\n\n\n<p>The excavation of two 3-kilometer tunnels that exdend out in the right angle from the Atotsu entrance&#8211;located at the southernmost point of the detector&#8211;started in May 2012. The excavation of Y-arm was started from both ends, from Atotsu and Mozumi, which is located Northwest of Atotsu, meeting at 1,754-meter point from Atotsu. The X-arm excavation is also nearing the end, now at around three-quarter of the full length.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"270\" src=\"https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/09\/20131206kagra4.jpg\" alt=\"\" class=\"wp-image-4477\" srcset=\"https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/09\/20131206kagra4.jpg 400w, https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/09\/20131206kagra4-300x203.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p>&#8220;The KAGRA construction is proceeding at a good pace, aiming for the first observation of gravitational waves in the world,&#8221; says Prof. Takaaki Kajita, director of ICRR and Project Integrator of KAGRA. The construction will be completed in 2015, and the full-run operation will start in 2017-2018.<\/p>\n\n\n\n<p>&#8220;We owe much of the smooth operation to Kajima, the construction company, which has extensive experiences and know-how to deal with difficult issues we encounter as we proceed with the excavation,&#8221; comments Associate Prof. Masatake Ohashi of KAGRA group, ICRR. The KAGRA&#8217;s excavation pace marked the domestic record at 300-meter per month in September this year. He was relieved to have witnessed the successful tunnel blasting in the afternoon. &#8220;With this, we passed an important milestone.&#8221;<\/p>\n\n\n\n<p>The X-arm is planned to be completed this coming March, after which vacuum pipes and cryostats as well as other detector components will be installed and set-up for the initial operation in 2015.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"300\" src=\"\/prwps\/wp-content\/uploads\/2019\/06\/20131206kagra2.jpg\" alt=\"\" class=\"wp-image-2752\" srcset=\"https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/06\/20131206kagra2.jpg 400w, https:\/\/www.icrr.u-tokyo.ac.jp\/prwps\/wp-content\/uploads\/2019\/06\/20131206kagra2-300x225.jpg 300w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><figcaption>Y\u30a2\u30fc\u30e0\u8cab\u901a\u5f8c\u306e\u6e21\u308a\u59cb\u3081<\/figcaption><\/figure>\n\n\n\n<p>Link:<br><a href=\"http:\/\/gwcenter.icrr.u-tokyo.ac.jp\/en\">KAGRA Homepage<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Postscript on 2nd of January, 2014 Movie for completion of Y-Arm tunnel of KAGRA Original Article On December &#8230;<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","taxo_news":[18],"tag_news":[],"class_list":["post-8171","news","type-news","status-publish","hentry","taxo_news-topics","en-US"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.icrr.u-tokyo.ac.jp\/en\/news\/8171\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.2\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ICRR | Institute for Cosmic Ray Research University of Tokyo | 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