抽真空获取1.8K超流氦方案分析以及真空泵抽速的预测  

Analysis on obtaining HeII of 1.8K by vacuum-pumping and the prediction of the pumping speed

作　　者：陈煜[1] 郑青榕[1] 林文胜[1] 鲁雪生[1] 顾安忠[1] 

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200030

出　　处：《低温与超导》2006年第2期85-90,共6页Cryogenics and Superconductivity

基　　金：国家重点基础研究发展计划(973计划);国家自然科学基金(50476022);上海市科委重大项目(2004CB720703:03DZ14014)基金资助

摘　　要：低温地面支持系统(CGSE)是专为AMS-02国际合作科学实验项目开发研究的低温地面支持和冷却系统,该系统要完成将AMS-02超导磁体从环境温度到1.8K的冷却过程,超流氦(HeII)的获得是其重要环节。文中针对抽真空获取HeII的方案进行了比较详细的分析和计算,同时针对此方案给出了其物理过程的T-s图、流程简图和实现该过程的主要设备。最后针对此方案,对真空泵抽速进行了预测,这将对后续阶段真空泵的选型具有指导意义。Cryogenic ground supporting equipment （CGSE） developed for the international cooperation scientific experimental item AMS - 02 is the cryogenic ground supporting and cooling system, and it will complete the cooling process of the superconductor in AMS - 02 from ambient temperature to 1.8K. how to obtain the superfluid helium （HelI） of 1.8K is a very important work. Detailed calculation and analysis of the vacuum - pumping scheme is the main content of this article, and the temperature - entropy diagram, flow diagram, and equipments realizing the scheme of the process have been put forward at the same time. The pumping speed is predicted according to the vacuum - pumping program, and it is very instructive and meaningful for choosing the vacuum pump in the succeeding phase.

关 键 词：超流氦 抽真空 抽速 

分 类 号：TB752[一般工业技术—真空技术] TB661