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Floor deformation of J-PARC linac after the Tohoku Earthquake in Japan

東北地方太平洋沖地震によるJ-PARCリニアックの変形

森下 卓俊; 浅野 博之; 池上 雅紀*

Morishita, Takatoshi; Asano, Hiroyuki; Ikegami, Masanori*

2011年3月11日に発生した東北地方太平洋沖地震によって、J-PARCリニアック加速器トンネルでは高さ方向40mm以上、水平方向25mmにおよぶ変形が発生した。地震後においても部分的な沈下傾向がおよそ2か月間継続した。また、リニアックは建家連結部を2か所有しており、ここでも数ミリの段差状の変動が起こっている。現在、リニアックアライメント復旧に向け、再アライメントに着手した。

The alignment has seriously been damaged due to the large earthquake on March 11th, 2011 in eastern Japan. There has been observed more than 40 mm settlement and about 25 mm horizontal deformation at the straight section in the linac accelerator tunnel. After that earthquake, there was continuous settlement in the straight section for two months. The linac accelerator tunnel has two expansion joints at the transport section to RCS. At these joints, abrupt displacements have been observed more than several millimeters both horizontally and vertically. Now, realignment started for restoration of the linac alignment.

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