Abstract
The Great East Japan Earthquake, which occurred on March 11, 2011, damaged a superconducting NMR magnet installed in the National Institute for Materials Science (NIMS) in Tsukuba, Japan. We have developed an instrument to visualize a material cooled in cryogenics to repair the magnet. A temperature controlled video scope works well in a helium gas environment and in the vicinity of a liquid helium surface. The instrument enables us to monitor the situation of a material in a low temperature state. Utilizing the instrument, we have succeeded in recovering the electric contact of an electric socket of a superconducting magnet covered with the contaminant of solid air. The socket was dug out using a drill while conducting monitoring using the instrument. Behaviors of solid air in cryogenic instruments for an injection of a helium gas were also visualized.
