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Abstract
High-temperature superconductivity power-grid technologies require a highly reliable and efficient cryocooler with cooling power of 100W to kilowatt level at liquid-nitrogen temperatures to produce cryogenic environments. This paper describes the design of a coaxial Stirling-type pulse tube cryocooler to meet this need. In the designed cryocooler, the regenerator and pulse tube are lengthened to avoid possible temperature inhomogeneity. In an experiment, the azimuthal temperature difference at the middle of the regenerator was less than 30K. With 7.6kW electric power input, the cryocooler offers more than 520W cooling power at 80K corresponding to a relative Carnot efficiency of 18.2%. When the cooling power was less than 370W, the efficiency is higher than 20%.
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