A Compact Cryocooling System With Subcooled Liquid Nitrogen for Small HTS Magnets

Title
A Compact Cryocooling System With Subcooled Liquid Nitrogen for Small HTS Magnets
Author
이방욱
Keywords
cooling; cryogenics; HTS (high-temperature superconductor) magnet; liquid nitrogen; CRYOGENIC COOLING SYSTEM; NATURAL-CONVECTION
Issue Date
2008-06
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, v. 18, No. 2, Page. 1479-1482
Abstract
A compact cryogenic cooling system is developed for small HTS magnets to be continuously refrigerated in subcooled liquid nitrogen at temperatures below 77 K by a cryocooler. This thermal design is particularly useful when electrical insulation and compactness are significant at the same time. HTS elements are immersed in a cylindrical liquid-nitrogen vessel, and a copper band is brazed around the exterior sidewall of the cylinder at vertical location just under the liquid level in order to achieve peripherally uniform cooling with a GM cryocooler. The vapor space above liquid nitrogen in the vessel provides a fully open room for current leads and mechanical supports to the magnets. Heat is removed from the HTS magnets by natural convection of subcooled liquid nitrogen to the cold sidewall. The key components are designed based on heat transfer analysis. A prototype is fabricated, and it is successfully demonstrated that the thermal load is effectively removed and temperature is spatially uniform.
URI
https://ieeexplore.ieee.org/document/4493367http://repository.hanyang.ac.kr/handle/20.500.11754/80483
ISSN
1051-8223
DOI
10.1109/TASC.2008.920553
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > ELECTRICAL ENGINEERING(전자공학부) > Articles
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