EBIT装置零蒸发低温超导磁体系统的研制  

Development of the superconducting magnet system with zero evaporation for Electron Beam Ion Trap(EBIT)

作　　者：张敏[1] 陈文革[1] 王福堂[1] 陈治友[1] 何鹏[1] 朱加伍[1] 黄鹏程[1] 王超[1] 路迪[2] 付云清[2] 

机构地区：[1]中国科学院强磁场科学中心,合肥230031 [2]复旦大学现代物理研究所,上海200433

出　　处：《低温与超导》2011年第7期42-46,共5页Cryogenics and Superconductivity

摘　　要：介绍了EBIT(Electron Beam Ion Trap,电子束离子阱)装置零蒸发低温超导磁体系统的研制过程与超导磁体的性能测试结果。该系统中超导磁体由一对上下布置的分离线圈组成,中心最大磁场强度可达4.5T,在中心轴线上±10mm内磁场均匀度优于2×10-4,磁场衰减系数在8h小于1×10-4;同时其低温杜瓦系统采用双冷屏结构,并通过二级G-M制冷机冷却冷屏来降低液氦的蒸发量。超导磁体的性能测试结果表明满足用户基本要求。Development of the superconducting magnet system with zero evaporation for Electron Beam Ion Trap （EBIT） was almost completed. The superconducting magnet of EBIT was arranged by a pair of split coils up and down, and the peak of magnetic field strength of superconducting magnet was up to 4.5 T, the uniformity was better than 2 ×10^-4 in the range of ± 10mm on the central axis of magnet, and the time decaying ratio of magnet was better than 1×10^-4 in 8h with closed - loop current. In order to reduce the consumption of liquid helium, the cryogenic system included two cooling - shields cooled by two stage G - M refrigerator. At present, the performance test results show the superconducting magnet of EBIT can meet that user＇s basic demands.

关 键 词：零蒸发 超导磁体 磁场均匀度 G—M制冷机 

分 类 号：TP212.6[自动化与计算机技术—检测技术与自动化装置]