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Achieving hundred-watt-class cooling near 20 K is critical for the development of high-temperature superconducting (HTS) magnets, yet remains challenging for regenerative cryocoolers. This work presents recent advances at Tongji University in three pulse tube cryocooler (PTC) configurations designed to improve phase control, recover expansion power, and enhance cooling capacity.
The displacer type PTC uses a gas-driven displacer to control the phase relationship between pressure and mass flow while recovering part of the expansion PV power. Experiments on the connecting tube and on auxiliary inertance tube or orifice phase shifters showed that these components can improve phase matching and system performance. Two-stage displacer type PTC achieved minimum temperatures of 15.6-16.9 K in the reported configurations.
The shared inertance tube PTC connects the hot ends of two pulse tubes to a common inertance tube, enabling the redistribution of phase-shifting capability and PV power between the cold heads. An analytical model combining the dual Helmholtz resonator analogy with the transfer matrix method was developed to clarify the phase-shifting mechanism and guide system design.
The third configuration is a two-stage thermally coupled GM-type PTC using active buffers. The prototype reached a minimum temperature of 7.8 K and delivered a cooling capacity of 100.1 W at 19.99 K. It also provided 50 W at 14.13 K. These results demonstrate the feasibility of hundred-watt-class cooling near 20 K for HTS applications.
These results demonstrate the feasibility of hundred-watt-class cooling near 20 K and provide a promising cryogenic solution for HTS magnet applications.
| Submitters Country | United Kingdom |
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