Cooling Stability Test of MgB2 Wire Immersed in Liquid Hydrogen under External Magnetic Field

Liquid hydrogen (LH2), which has large latent heat, low viscosity coefficient, is expected to be a candidate for a cryogen for superconducting wires, not only MgB2 but also other HTC superconductors. LH2 cooled superconducting wires are expected to have excellent electro-magnetic characteristics, wh...

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Bibliographic Details
Main Authors: Shirai, Yasuyuki, Hikawa, Kyosuke, Shiotsu, Masahiro, Tatsumoto, Hideki, Naruo, Yoshihiro, Kobayashi, Hiroaki, Inagaki, Yoshifumi
Format: Conference Proceeding
Language:English
Subjects:
Cooling
Critical current (superconductivity)
External pressure
Latent heat
Liquid hydrogen
Magnesium compounds
Magnetic fields
Magnetic properties
Physics
Stability tests
Superconductivity
Superconductors
Wire
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Summary:Liquid hydrogen (LH2), which has large latent heat, low viscosity coefficient, is expected to be a candidate for a cryogen for superconducting wires, not only MgB2 but also other HTC superconductors. LH2 cooled superconducting wires are expected to have excellent electro-magnetic characteristics, which is necessary to be clear for cooling stability design of LH2 cooled superconducting device, however, due to handling difficulties of LH2, there are only few papers on the properties of LH2 cooled superconductors, especially under external magnetic field. We designed and made an experimental setup which can energize superconducting wires immersed in LH2 with the current of up to 500A under the condition of external magnetic field up to 7 T and pressure up to 1.5 MPa. In order to confirm experimental method and safety operation of the setup, over current tests were carried out using MgB2 superconducting wires under various external magnetic field conditions. Critical current of the test wire at the temperature 21, 24, 27, 29 K under external magnetic fields up to 1.2 T was successfully measured. The resistance of the wire also was measured, while the transport current exceeded the critical current of the wire.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/507/2/022031