Abstract
As very low temperature high frequency pulse tube cryocooler is the precondition of many space detection researches, it has been a hot topic in the field of pulse tube cryocooler. Improving the cryocooler’s performance is a common goal of researchers. In this paper, the regenerator material and the compressor of the second-stage pulse tube cryocooler as well as the first-stage pulse tube cryocooler are experimentally optimized using a new thermally coupled high frequency pulse tube cryocooler. Finally, more than 20mW of cooling power is achieved at 8K and the electric power decreases from 450W to 300W. The results increase the reliability of the space application of NbN terahertz detectors.
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