The replacement of second-stage cooler solves the problem.
更换二级冷却器，解决了此故障。
A lowest no-load temperature of 13.8 K has been obtained for the first stage without thermal connector, which is a new record for the single-stage pulse tube cooler.
在没有热桥连接的情况下，单独测试第一级最低制冷温度达到13.8K，这是单级脉管制冷机获得的最低制冷温度新纪录。
The conclusions obtained in this paper can provide some theoretical meanings for the optimal design of multi-stage semiconductor cooler.
本文所得的结果对多级半导体制冷的优化设计具有一定的理论意义。
After using oil injection instead of water, analysis is also given to the actual situations of after-cooler of charge gas compressor and inter-stage tank.
分析了由注油改为注水后，裂解气压缩机后冷器和段间罐的情况。
Use single stage version to reach the temperature of 20 K is a difficulty for high frequency pulse tube cooler (PTC). Multi-stage version is a popular method to reach the low temperature.
单级高频脉冲管制冷机直接降低到20K以下温区存在很大困难，采用多级方案是高频脉冲管制冷机获得更低温度的主要方法。
Use single stage version to reach the temperature of 20 K is a difficulty for high frequency pulse tube cooler (PTC). Multi-stage version is a popular method to reach the low temperature.
单级高频脉冲管制冷机直接降低到20K以下温区存在很大困难，采用多级方案是高频脉冲管制冷机获得更低温度的主要方法。
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