Abstract
This chapter discusses the designs and constructions a three-stage pulse tube refrigerator with linear motor compressor. Its purpose is to know the possibility of the high frequency operation for the space application of the multi-staged pulse tube refrigerator to give the cooling temperature below 20 K. The chapter uses three-staged pulse tubes of parallel configuration combined with the linear motor compressor. As the design concept of multi-staging pulse tube, the parallel configuration of pulse tubes has been selected. This method has been confirmed by the G-M type pulse tube refrigerator to give the cooling temperature down to 4 K. The G-M type cooler, in general, operated at one order lower frequency than the Stirling type cooler.
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