1. Hyogo University of Teacher Education, Kato, Hyogo 673-1494, Japan
2. Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 3-1-2 Kouto, Kamigoori, Ako-gun, Hyogo 678-1205, Japan
3. Department of Electrical Materials and Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
4. Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
5. Japan Synchrotron Research Institute, Hyogo 679-5198, Japan
6. ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France
7. Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577, Japan