Cooling Large HTS Magnet Coils using a Gas Free-convection Cooling Loop Connected to Coolers

The cool-down and liquefaction of helium in free convection cooling loops has been demonstrated in superconducting magnets greater than 2 meters in diameter. At 4.4K, temperature drops between the magnet hot spot and the coolers of less than 0.2 K have been achieved in large coils that are more than...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 502; no. 1; pp. 12100 - 12104
Main Author Green, Michael A
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.04.2019
Subjects
Circuits
Convection cooling
Coolers
Cooling
Free convection
Gas cooling
Liquefaction
Low temperature
Magnet coils
Superconducting magnets
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Summary:The cool-down and liquefaction of helium in free convection cooling loops has been demonstrated in superconducting magnets greater than 2 meters in diameter. At 4.4K, temperature drops between the magnet hot spot and the coolers of less than 0.2 K have been achieved in large coils that are more than 1 meter from the coolers. At temperatures greater than 20 K, larger temperature drops between the magnet and the coolers are permitted. This paper shows that free-convection gas cooling can be viable for both cooling and cooling down large HTS magnets. This paper presents the flow circuit parameters needed to achieve a reasonable cool-down time and a low temperature drop between the magnet and the cooler cold heads with no liquid cryogen in the loop.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/502/1/012100