2K-class or 4K-class mechanical Joule-Thomson (JT) throttling refrigeration system is crucial to cool far infrared detector or extremely high sensitivity and resolution detector，such as SQUID（Superconducting quantum interference device）, SNSPD（superconducting nanowire single photon detector）
A novel efficient precooled JT throttling refrigeration system is currently under development. In this...
With the development of the frontier domains such as quantum computing, condensed matter physics and space exploration, there is an urgent need for the multi-stage ultra-low temperature refrigerators to reduce the internal thermal noise and external thermal interference. The superfluid 4He system is a key component at the 1 K stage of ultra-low temperature refrigerators. The cooling capacity...
Dilution refrigerators, as the key instruments of quantum research, greatly contribute to the development of quantum computing. Continuous heat exchanger is an indispensable core component in the dilution refrigerator, which precools the incoming concentrated phase by exchanging heat with the return diluted phase. In this study, we propose a thermodynamic model of a continuous heat exchanger...
Cryogenic technology plays a significant role in ground experiments and space exploration. ³He sorption refrigeration is one of the few methods capable of achieving temperatures below 500 mK, and due to its advantages such as small size, light weight, no vibration, no electromagnetic interference, and simple operation, it has considerable competitiveness in the field of space ultra-low...
A continuous tube-in-tube heat exchanger (TTHx) is used to pre-cool the concentrated stream (99.9% He-3) from 700 to 100 mK (or below) using a dilute stream (6.4% He-3 and 93.6% He-4) in a dilution refrigerator (DR). In commercially available DRs, the inner tube carrying the concentrated stream in TTHx is helically wound (H-TTHx) to increase the compactness and improve the effectiveness....
In this study, a counterflow heat exchanger for a Joule–Thomson (JT) cryocooler was developed and integrated into a closed-cycle cryocooler. The cryocooler uses a two-stage Gifford–McMahon refrigerator as the precooler and helium-4 as the working fluid for the JT cooling circuit. The cryocooler achieved temperature below 2 K, with the cooling power dependent on its operational settings. A...
