1. Department of Applied Science and Technology Faculty of Science and Technology, Sophia University, Tokyo, Japan
2. Railway Technical Research Institute, Kokubunji, Tokyo, Japan
3. Mayekawa MFG, Koto, Tokyo, Japan
4. High Energy Accelerator Research Organization, Tsukuba, Ibaraki, Japan
5. National Institute for Fusion Seience, Toki, Gifu, Japan
6. Tohoku University, Aoba, Sendai, Japan
7. Ntional Institute for Materials Science, Tsukuba, Ibaraki, Japan