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13.8 K，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。
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