Speaker
Description
This paper presents the development and experimental investigation of a compact two-stage free-piston Stirling cryocooler for superconducting applications. The cryocooler adopts a coaxial configuration, in which the compressor piston and two-stage displacer are arranged along a single axis, providing a compact structure suitable for integration with superconducting systems. The original design also incorporates gas bearings and an external-coil magnetic circuit to improve reliability and compactness.
To improve the low-temperature performance, different regenerator materials, including stainless-steel spheres, holmium-copper material, and stainless-steel wire mesh, were experimentally compared. After optimization, the cryocooler achieved a minimum no-load temperature of 14 K. At an operating frequency of 50 Hz and an electrical input power of 220 W, a cooling capacity of 1 W was obtained at 20 K.
The results demonstrate the capability of the developed cryocooler to provide compact refrigeration in the 20 K temperature range. Owing to its single-axis architecture, the cryocooler also shows potential for future integration with rotating superconducting electrical machines, where it may be mounted on the rotor and rotate together with it. The feasibility and performance under rotating conditions remain to be experimentally investigated.
| Submitters Country | China |
|---|---|
| Are you a student? | No |
| Author Affiliations & Email Addresses | I confirm that valid email addresses and affiliations have been added for all co-authors. |
| Co-Author Affirmation | By clicking here, I, the submitting author, affirm that all co-authors know of and concur with the submission of this abstract. |