1. Department of Accelerator and Medical Physics, Institute for Quantum Medical Science, National Institutes for Quantum Science and Technology, Chiba, Japan
2. Accelerator Engineering Corporation, Chiba, Japan
3. High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki, Japan
4. National Institute for Materials Science, Tsukuba-shi, Ibaraki, Japan
5. Toshiba Energy Systems and Solutions Corporation, Yokohama-shi, Kanagawa, Japan