High frequency pulse tube cryocooler with nonmetallic cold head
High frequency pulse tube cryocooler with nonmetallic cold head
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DOI：
10.1016/j.ijrefrig.2012.08.012
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Y. Xun;Q. Dai;Luwei Yang;J. Liang
中科院分区：
文献类型：
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作者：
Y. Xun;Q. Dai;Luwei Yang;J. Liang
针对SQUID制冷等特殊应用，设计并测试了一台全非金属同轴脉冲管制冷机（PTC），并对尼龙网作为回热器的性能进行了研究。对尼龙网在金属PTC中的应用研究表明，尼龙网在80 K左右的温度下适合作为冷头中的回热器基体。然而，使用尼龙网的制冷机的测量性能被发现是显着不如使用不锈钢网。变形的尼龙网被认为是性能损失的主要原因之一。我们研制的非金属制冷机在80 K时的最低温度为74 K，制冷量为0.14 W。虽然非金属PTC的损耗比原来预测的要大，但仍有很大的改进空间。这种完全非金属PTC是无需低温液体的SQUID冷却的替代选择。
For some special applications, such as SQUID cooling, an entirely nonmetallic coaxial pulse tube cryocooler (PTC) was designed and tested, and the performance of nylon mesh as a regenerator matrix was also investigated. The study of nylon mesh in metallic PTCs shows that nylon mesh is suitable as regenerator matrix in the cold head at temperatures around 80 K. However, the measured performances of cryocoolers using nylon mesh are found to be significantly worse than that using stainless steel mesh. The distorted nylon mesh is considered to be one of the main reasons for the loss in performance. A lowest temperature of 74 K and a cooling capacity of 0.14 W at 80 K has been obtained by our nonmetallic cryocooler. Although the losses of nonmetallic PTC are bigger than the original prediction, there is still a large room for improvement. Such an entirely nonmetallic PTC is an alternative choice for SQUID-cooling without cryogenic liquids.