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Report No.
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Floor deformation of J-PARC linac after the Tohoku Earthquake in Japan

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

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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