1.8K常压超流氦低温系统的设计与分析

摘要

中国科学院等离子体物理研究所ITER CC导体测试装置背景超导磁体,由4.2K液氦浸泡冷却,能够提供7T背景场,为了满足超导导体测试需要更大背景场(10 T)的要求,将采用1.8K超流氦浸泡冷却.针对该测试装置的低温系统设计了一种1.8K常压超流氦低温系统,给出了该系统的关键组成部分并对获取1.8K常压超流氦的流程进行了分析.针对预冷与节流相结合获取1.75 K超流氦方案进行了分析和计算,同时针对此方案给出了其物理过程的T-s图,计算了1.75 K超流氦液体得率.%The superconducting magnet of the testing facility in Institute of Plasma Physics, Chinese A-cademy of Sciences(ASIPP) for ITER CC conductor was immersed by the 4.2 K liquid helium cooling to provide a 7 T background magnetic field. In order to meet the demands of superconducting conductor test requiring a larger background field (10 T) ,the superconducting was immersed by a 1. 8 K super fluid helium. A 1.8 K-atmospheric super fluid helium cryogenic system was designed for the testing facility, the systems key components were given and how to obtain the 1. 8 K-atmospheric super fluid helium was analyzed. Calculation and analysis of the throttling process according to pre-cooling and the temperature-entropy diagram of the process were put forward. The liquid ratios of super fluid helium of the method was computed and given.