Cold-Cycle Dilution Refrigerator (CCDR)

摘要-9711304 Brisson，John G.首席研究员建议开发一种用于100MK以下制冷的冷循环稀释式制冷机。常规稀释式制冷机将3He低温稀释为4He，实现亚开尔文冷却。这一过程的低效与3He组分从0.6K到室温再循环有关。在所提出的设计中，压缩机在0.25K(而不是传统的稀释式冰箱在300K)蒸馏和泵送混合器中的3He组分，并将3He组分直接返回混合室。压缩机将使用超流体斯特林制冷机保持在0.25K。该项目还将涉及低损耗、低温压缩机阀门的开发。由此产生的CCDR将具有更高的效率、更小的体积和更低的成本。

Abstract - 9711304 Brisson, John G. The principal investigator proposes to develop a cold-cycle dilution refrigerator (CCDR) for cooling below 100 mK. Conventional dilution refrigerators dilute 3He into 4He at a low temperature to achieve sub-Kelvin cooling. An inefficiency of this process is related to the circulating of the 3He component from 0.6 K to room temperature and back again. In the proposed design, the compressor distills and pumps the 3He component of the mexture at 0.25 K (rather than at 300 K in conventional dilution refrigerators) and directly returns the 3He component to the mixing chamber. The compressor will be maintained at 0.25 K using a superfluid Stirling refrigerator. The project will also involve the development of low-loss, low-temperature compressor valves. The resulting CCDR will have improved efficiency, small size and cost.