Experimental investigation on a sub-Kelvin adiabatic demagnetization refrigerator (ADR) integrated with a 4He sorption cooler.
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| Title: | Experimental investigation on a sub-Kelvin adiabatic demagnetization refrigerator (ADR) integrated with a 4He sorption cooler. |
|---|---|
| Authors: | Kwon, D.1 (AUTHOR), Park, J.1 (AUTHOR), Jeong, S.1,2 (AUTHOR) skjeong@kaist.ac.kr |
| Source: | Cryogenics. Oct2025, Vol. 151, pN.PAG-N.PAG. 1p. |
| Subjects: | High temperature superconductors, Liquid helium, Activated carbon, Thermal insulation, Thermal resistance |
| Abstract: | • An integrated sub-Kelvin cooling system using a sorption cooler and ADR was experimentally studied. • The ADR reached 0.29 K after demagnetization from a 4.1 T magnetic field. • Despite thermal resistance and insulation limits, it achieved 0.3 K without costly helium-3. This paper experimentally investigates a sub-Kelvin adiabatic demagnetization refrigerator (ADR) with an integrated sorption pump. The developed ADR consists of a high-temperature superconducting (HTS) magnet, in which a single crystalline gadolinium gallium garnet (GGG) with a volume of 10.4 cc is installed, and the integrated 4He sorption cooler. Both the magnet and the sorption cooler reject heat to a commercial 4 K two-stage Gifford-McMahon (GM) cooler. The sorption cooler provides the cooling effect through evaporation of liquid helium, which occurs inside a helium pot and is driven by a sorption pump filled with activated charcoal. In order to integrate the sorption cooler with the ADR, the GGG serves as an evaporator of the helium pot. The cooling performance of the ADR is evaluated through a continuous cyclic operation. During the regeneration process, the GGG is magnetized, and the helium pot is filled with helium desorbed from the sorption pump. Once the 4.1 T-magnetized GGG and the liquid helium in the helium pot are sufficiently cooled by the GM cooler, the sorption cooling process is initiated to precool the GGG below 2 K. Finally, the GGG is demagnetized by discharging the magnet through an external dump resistor, achieving the lowest temperature of 0.29 K. The maximum cooling capacity of the ADR at 0.8 K is estimated to be 1.35 J/cycle. Detailed results and findings are discussed in the remainder of the paper. [ABSTRACT FROM AUTHOR] |
| Copyright of Cryogenics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 188152699 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Experimental investigation on a sub-Kelvin adiabatic demagnetization refrigerator (ADR) integrated with a 4He sorption cooler. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kwon%2C+D%2E%22">Kwon, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Park%2C+J%2E%22">Park, J.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jeong%2C+S%2E%22">Jeong, S.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> skjeong@kaist.ac.kr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Cryogenics%22">Cryogenics</searchLink>. Oct2025, Vol. 151, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22High+temperature+superconductors%22">High temperature superconductors</searchLink><br /><searchLink fieldCode="DE" term="%22Liquid+helium%22">Liquid helium</searchLink><br /><searchLink fieldCode="DE" term="%22Activated+carbon%22">Activated carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+insulation%22">Thermal insulation</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+resistance%22">Thermal resistance</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: • An integrated sub-Kelvin cooling system using a sorption cooler and ADR was experimentally studied. • The ADR reached 0.29 K after demagnetization from a 4.1 T magnetic field. • Despite thermal resistance and insulation limits, it achieved 0.3 K without costly helium-3. This paper experimentally investigates a sub-Kelvin adiabatic demagnetization refrigerator (ADR) with an integrated sorption pump. The developed ADR consists of a high-temperature superconducting (HTS) magnet, in which a single crystalline gadolinium gallium garnet (GGG) with a volume of 10.4 cc is installed, and the integrated 4He sorption cooler. Both the magnet and the sorption cooler reject heat to a commercial 4 K two-stage Gifford-McMahon (GM) cooler. The sorption cooler provides the cooling effect through evaporation of liquid helium, which occurs inside a helium pot and is driven by a sorption pump filled with activated charcoal. In order to integrate the sorption cooler with the ADR, the GGG serves as an evaporator of the helium pot. The cooling performance of the ADR is evaluated through a continuous cyclic operation. During the regeneration process, the GGG is magnetized, and the helium pot is filled with helium desorbed from the sorption pump. Once the 4.1 T-magnetized GGG and the liquid helium in the helium pot are sufficiently cooled by the GM cooler, the sorption cooling process is initiated to precool the GGG below 2 K. Finally, the GGG is demagnetized by discharging the magnet through an external dump resistor, achieving the lowest temperature of 0.29 K. The maximum cooling capacity of the ADR at 0.8 K is estimated to be 1.35 J/cycle. Detailed results and findings are discussed in the remainder of the paper. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Cryogenics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.cryogenics.2025.104179 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: High temperature superconductors Type: general – SubjectFull: Liquid helium Type: general – SubjectFull: Activated carbon Type: general – SubjectFull: Thermal insulation Type: general – SubjectFull: Thermal resistance Type: general Titles: – TitleFull: Experimental investigation on a sub-Kelvin adiabatic demagnetization refrigerator (ADR) integrated with a 4He sorption cooler. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kwon, D. – PersonEntity: Name: NameFull: Park, J. – PersonEntity: Name: NameFull: Jeong, S. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 10 Text: Oct2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00112275 Numbering: – Type: volume Value: 151 Titles: – TitleFull: Cryogenics Type: main |
| ResultId | 1 |
