Present Status of the Tsukuba Magnet Laboratory
- 115 Downloads
The Tsukuba Magnet Laboratory (TML) is located 324 km from the seismic center of the first 9.0 magnitude earthquake that struck Japan on Friday, March 11, 2011. TML suffered peak ground acceleration of 372 Gal. The large 930 and 1030 MHz nuclear magnetic resonance (NMR) magnets of TML were severely affected by the earthquake. The hybrid magnet and its control system were not significantly damaged. After the earthquake, serious electricity shortages occurred and our awareness of the importance of energy conservation increased. A control system for a hybrid magnet has been in development for several years. The system has sophisticated monitoring capability, detailed and rapid data recording, and is now nearing completion. The newly developed system provides detailed data; our ability to interpret this data and identify difficulties in the acquisition of critical data is improving. We are now beginning to optimize operations to reduce electricity consumption and achieve higher efficiency magnet operations.
KeywordsHigh magnetic field Hybrid magnet NMR
We would like to thank the Data Management Center of the National Research Institute for Earth Science and Disaster Prevention.
- 1.K-NET and KiK-net, the National Research Institute for Earth Science and Disaster Prevention: strong-motion seismograph networks. See online http://www.kyoshin.bosai.go.jp/kyoshin/
- 5.The official report of the National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission (2012) Google Scholar
- 6.Radiation dose in Ibaraki prefecture (2011). http://www.pref.ibaraki.jp/important/20110311eq/20110922_01/files/20110922_01e.pdf
- 8.MEXT and DOE Airborne Monitoring (2011). http://radioactivity.mext.go.jp/en/list/241/list-1.html
- 9.Map concerning Radioactivity Concentration in Ibaraki prefecture, Deposition of Cs-134 and Cs-137, (2011). http://www.pref.ibaraki.jp/important/20110311eq/20110922_01/files/20110922_01b.pdf
- 10.Radioactivity Survey Data in Japan, Environmental and Dietary Materials, vol. 146 (2011) Google Scholar
- 12.Preliminary Dose Estimation from the nuclear accident after the 2011 Great East Japan Earthquake and Tsunami. http://www.who.int/ionizing_radiation/pub_meet/fukushima_dose_assessment/en/
- 13.K. Hashi, T. Shimizu, S. Ohki, T. Noguchi, T. Kiyoshi, 24th International Cryogenic Engineering Conference-International Cryogenic Materials Conference, 17P-P05-04 (2012) Google Scholar
- 14.T. Shimizu, K. Hashi, S. Ohki, T. Noguchi, T. Kiyoshi, 2011 Fall meeting of Cryogenics and Superconductivity Society of Japan, 1B-p03-04, 27-28 (2011) Google Scholar