抄録
Requirements of small closed-cycle refrigeration systems to cryoelectronic devices have been increased. Most of the small superconducting devices including the applications of SQUID need the cooling temperature near 4K. For this temperature region, high efficiency and reliability is difficult to obain by using a single refrigerator.
This paper reviews small closed-cycle refrigerators as follows:
(1) Requirements for cryocooler.
(2) Introductions of refrigeration cycles of interest.
(3) Refrigeration systems for small superconducting devices.
Most of the informations were obtained from the proceedings of a meeting held at NBS in Oct. 1977.
