Search

With the development of quantum computing and other fields, dilution refrigerators are required to have greater cooling capacity. More cooling power means larger 3He flow rate and the corresponding gas circulation system. In dry dilution refrigerators, 3He needs to be pressurized by compressor for the high inlet pressure. This paper introduces a dry dilution refrigerator driven by a designed high-power two-stage linear compressor, and the reliability of the compressor is verified by experiments. 3He can be pressurized to a pressure above 200 kPa at a flow rate of nearly 1 mmol/s and be condensed successfully in the condensatiion process. The refrigerator, precooled by a pulse tube cryocooler, can obtain a minimum temperature of 19 mK and a cooling capacity of 250 μW at about 100 mK at the total flow rate of about 0.45 mmol/s. The maximum power of 3He compressor can reach 300 W and the maximum compression ratio is over 10, which can be used as the 3He driver of high-power dilution refrigerators or closed-cycle space dilution refrigerators. [ABSTRACT FROM AUTHOR]

• Building a complete gas-gap heat switch model that covers the entire switching process. • Integrating activated carbon's adsorption characteristics into the theoretical model. • Designing the 4He gas-gap heat switch based on the model and testing its performance to validate the model. • Applying the gas-gap heat switch to a 4He sub-Kelvin sorption cooler and achieving a temperature of 773 mK. Gas-gap heat switches (GGHSs) are significant components in sub-Kelvin sorption coolers (SKSCs). To develop an effective GGHS for SKSCs, a complete GGHS theoretical model is proposed by integrating the adsorption characteristics of activated carbon and the principle of GGHSs. This model establishes a relationship between the temperature of activated carbon and the corresponding thermal conductance of GGHSs. Based on this model, a 4He GGHS was designed, which consists of two cylindrical copper blocks separated by a 0.2 mm gas gap and a surface area of 9.896 cm2. The device was charged with 100 kPa of 4He at 297 K. Near the base temperature of the GM cryocooler of 3 K, an ON thermal resistance of 20 K/W and an OFF thermal resistance of 21,650 K/W with 1 mW applied to the hot end were obtained, achieving a switching ratio of 1082.5. The experimental results were analyzed and compared with the theoretical data, and proved to be in good agreement. Finally, the GGHS was integrated with a SKSC, achieving an ultimate temperature of 773 mK. [ABSTRACT FROM AUTHOR]