Cold-Cycle Dilution Refrigerator (CCDR)

摘要：Brisson， John G.首席研究员建议开发一种冷循环稀释冰箱（CCDR），用于冷却低于100 mK。传统稀释冰箱在低温下将3He稀释成4He，以实现亚开尔文冷却。该工艺的低效率与3He组分从0.6 K循环到室温并再次循环有关。在提出的设计中，压缩机在0.25 K（而不是传统稀释冰箱的300 K）下蒸馏和泵送混合物中的3He组分，并直接将3He组分返回混合室。压缩机将保持在0.25 K使用超流体斯特林冰箱。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.