Graduate University of Chinese Academy of Sciences Beijing 100049 China;
Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China;
Beijing Institute of Aviation Materials Beijing 100095 China;
Beijing Hejili Science and Technology Development Co. Ltd. Beijing 100026 China;
Ningxia Orient Tantalum Industry Co. Ltd. Shizuishan 753000 China;
High Energy Accelerator Research Organization (KEK) 1-10ho Tsukuba Ibaraki-305-0801 Japan;
Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China;