制冷机冷却型超导磁体杜瓦的研制

Development of Superconductor Magnet Dewar with G-M Refrigerator Cooling

介绍了带制冷机冷却的超导磁体系统杜瓦的设计、制作及实验结果分析。杜瓦采用 4 0 K、10 K双制冷屏结构 ,其室温磁场孔径为 75 mm,长 4 15 m m。试验结果为 :液氦蒸发率为 0 .6 9升 /天 (在 2 0天连续试验期内 ) ,优于合同规定的指标 (2 .4升 /天 )。双制冷屏由一台双级 G- M制冷机冷却 ,工作时一级冷屏温度为 35 K,二级冷屏温度为 7.0 K。磁体系统的磁场强度为 3T。

Recently, the liquid helium dewar with the G-M refrigerator cooling for superconductor magnet is successfully developed. The Dewar has two cooling-shields and provided by the G-M refrigerator which the first stage is 31W at 40K and second stage is 1.1W at 6K. The room temperature bore is Φ75mm, length is 415mm. The design, structure, manufacture and experiment results of tests and experiments are introduced in this paper. The performances are vapor rate of liquid helium is 0.69 liter/day around in 20 days, temperature of the first cooling-shield is 35K and second one is 7.0K, magnetic field strength is up to 3T. It will meet user's requires very well.