期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 2, 页码 3418-3426出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c19581
关键词
superconducting joint; magnetic field screening; MgB2 conductor; MRI applications; persistent-mode operation
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP18F18714]
- Cryogenic Station, Research Network and Facility Services Division, National Institute for Materials Science (NIMS), Japan
- ARC Linkage Project [LP200200689]
- Australian Research Council [LP200200689] Funding Source: Australian Research Council
A superconducting joint architecture is proposed to screen external magnetic fields in MRI magnet applications. By exploiting the diamagnetic property of superconducting MgB2, a novel joint design successfully achieved magnetic field screening effect, while maintaining a constant critical current.
A superconducting joint architecture to join unreacted carbon-doped multifilament magnesium diboride (MgB2) wires with the functionality to screen external magnetic fields for magnetic resonance imaging (MRI) magnet applications is proposed. The intrinsic diamagnetic property of a superconducting MgB2 bulk was exploited to produce a magnetic field screening effect around the current transfer path within the joint. Unprecedentedly, the joint fabricated using this novel architecture was able to screen magnetic fields up to 1.5 T at 20 K and up to 2 T at 15 K and thereby almost nullified the effect of the applied magnetic field by maintaining a constant critical current (I-c). The joint showed an I-c of 30.8 A in 1.5 T at 20 K and an ultralow resistance of about 3.32 x 10(-14) Omega at 20 K in a self-field. The magnetic field screening effect shown by the MgB2 joint is expected to be extremely valuable for MRI magnet applications, where the I-c of the joints is lower than the I-c of the connected MgB2 wires in a given magnetic field and temperature.
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