Abstract
The object of this work is to develop a Stirling cycle refrigerator which can be cooled to 4-5K range without the use of a Joule-Thomson loop. Rare earth compounds were used in the regenerator matrix and metal bellows was used as the compressor and the expanders for the purpose of improving the cryogenic performance.
According to the test results obtained up to now, the refrigeration capacity of more than 2W was attained below 5K, starting from 80K.
Furthermore, recondensation of GHe in a seal off cryostat a 1.9W heat load was realized starting from room temperature.
