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Description
A high-capacity closed-cycle 1 K cryostat based on a capillary Joule–Thomson (J–T) expansion stage is developed and experimentally characterized for low-temperature physical property measurements of superconducting detectors. The cryostat achieves a base temperature of 1.37 K and provides a cooling power of approximately 30 mW at 1.54 K. By employing a lower-impedance capillary, the cooling power can be increased up to 110 mW, at the expense of a moderate increase in the base temperature. The steady-state cooling performance is analyzed using an enthalpy-based thermodynamic model that accounts for both latent and sensible heat contributions of helium in different operating regimes. The cryostat also exhibits excellent temperature stability, with root-mean-square temperature fluctuations below 3.3 mK under typical thermal loads, satisfying the requirements for precision low-temperature material characterization. The demonstrated high cooling capacity, stable operation, and clear performance scaling provide practical design guidelines for capillary-based J–T cryostats targeting superconducting detector development and related cryogenic measurement applications.
| Submitters Country | China |
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| Are you a student? | No |
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