Schemes for Producing 1.8 He Ⅱ and the Prediction of the Pumping Speed for the Method of Vacuum-Pumping  

作　　者：陈煜 郑青榕 鲁雪生 顾安忠 林文胜 

机构地区：[1]Inst.of Refrigeration and Cryogenics,Shanghai Jiaotong Univ.

出　　处：《Journal of Shanghai Jiaotong university(Science)》2007年第1期106-110,共5页上海交通大学学报（英文版）

基　　金：The National Natural Science Foundation of China ( No. 50476022 );Ministries and Commissions of Science and Technology of Shanghai Government (No. 03DZ 14014)

摘　　要：Cryogenic ground supporting equipment (CGSE) developed for international cooperation scientific experimental item AMS-02 is the ground supporting and cooling system, which will complete the cooling process of the superconductor of AMS-02 from ambient temperature to 1.8 K. Obtaining 1.8 K He Ⅱ by vacuum-pumping is discussed in detail and compared with the other three schemes. The results show that the scheme of vacuum-pumping not only could meet the requirement of the project much better but also has higher reliability compared with other schemes. To select the vacuum pump, the energy conservation model is presented according to the experimental system of CGSE. Therefore, the pumping speed is also determined.Cryogenic ground supporting equipment （CGSE） developed for international cooperation scientific experimental item AMS-02 is the ground supporting and cooling system, which will complete the cooling process of the superconductor of AMS-02 from ambient temperature to 1.8 K. Obtaining 1.8 K He Ⅱ by vacuum-pumping is discussed in detail and compared with the other three schemes. The results show that the scheme of vacuum-pumping not only could meet the requirement of the project much better but also has higher reliability compared with other schemes. To select the vacuum pump, the energy conservation model is presented according to the experimental system of CGSE. Therefore, the pumping speed is also determined.

关 键 词：He Ⅱ throttling PRE-COOLING vacuum-pumping pumping speed 

分 类 号：TN919.81[电子电信—通信与信息系统]