Note: Progress on the use of MgB2 superconducting joint technique for the development of MgB2 magnets for magnetic resonance imaging (MRI)

Kim, Y. G.; Song, Jung-Bin; Kim, J. C.; Kim, J. M.; Yoo, B. H.; Yun, Sunghee; Hwang, Duck Young; Lee, H. G.

doi:10.1063/1.4997257

Cited by 10 publications

(6 citation statements)

References 30 publications

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“…Superconducting joints for both monofilament ,,− and multifilament MgB 2 conductors ,,,− have been reported. The joints fabricated for multifilament MgB 2 conductors showed inferior performance compared with the joints fabricated for monofilament MgB 2 conductors owing to their finer filament size. ,,, Carbon (C)-doping is usually used in the MgB 2 material to improve its in-field performance. − However, the performance of the joints fabricated using C-doped MgB 2 conductors was found to be poorer compared with that of undoped MgB 2 conductors .…”

Section: Introductionmentioning

confidence: 99%

MgB₂ Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

Patel

Matsumoto

Kumakura

et al. 2022

ACS Appl. Mater. Interfaces

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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 × 10–14 Ω 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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Section: Introductionmentioning

confidence: 99%

MgB₂ Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

Patel

Matsumoto

Kumakura

et al. 2022

ACS Appl. Mater. Interfaces

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“…It has been shown that joint resistance as low as 5.48 × 10 −15 Ω is achieved for unreacted multifilament MgB 2 wires [22]. It is an aim to maintain the critical current value as well as the low resistance value, in this sense superconducting joints have not been fully optimized yet [27,28].…”

Section: Introductionmentioning

confidence: 99%

Optimized superconducting MgB₂ joint made by IMD technique

Avcı

Yetiş

Gajda

et al. 2023

Supercond. Sci. Technol.

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A novel type superconducting joining technique has been introduced to join unreacted IMD single-core MgB2 wires. Our method is based on fabricating a small diameter joint mould obtained by deforming an Nb/Cu composite tube with a longitudinal semi-cylindrical Mg and B composite into a thick round wire. The small diameter of the joint provided advantages such as rapid cooling, low resistance, and the unique core design inside the joint ensured a uniform MgB2 phase formation. Scanning electron microscope analysis revealed that the IMD MgB2 wires had excellent contact with the superconducting MgB2 bulk material inside the joint. The joint resistance, calculated from the decay of the trapped magnetic field over time, is a quite low value of 6.44×10-16 Ω at 20 K. The transport critical current (Ic) of the joint is 62 A at 20 K under a self-magnetic field, and the n-value of the joint is 66 at 20 K under 1.5 T. The results showed that the Ic of our joint could be determined precisely, regardless of whether the magnetic field was applied from low to high or from high to low value during I – V measurements.

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“…The superconducting joints of MgB 2 conductors have been reported to be fabricated with both monofilament conductors [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] and multifilament conductors [3,4,8,11,14,[29][30][31][32]. Only a few of these articles reported the performance of joints of reacted MgB 2 conductors [11,20,30].…”

Section: Introductionmentioning

confidence: 99%

Superconducting joints of reacted monofilament MgB₂ wires sintered by hot uniaxial pressing system

Liang,

Morawski,

Patel

et al. 2023

Supercond. Sci. Technol.

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Successful superconducting joints of reacted magnesium diboride (MgB2) monofilament wires are reported in this paper. The absence of a reliable method to develop superconducting joints between reacted MgB2 wires presents a major obstacle to the wider adoption of MgB2 as a material for magnet winding. A hot uniaxial pressing (HUP) system was exploited for sintering purposes since it can facilitate the formation of condensed in situ bulk on the wire filament. The wires were manufactured with an extra thick barrier material to protect the filament from damage during HUP sintering. The sintering temperature and pressure of the HUP system were varied to comprehend the best-performing joint. The performance of joints could be improved by depreciating the pores within the intermediate bulk of the joint. To prove this point, joints were cut to study their morphology. However, due to sintering in pressurised conditions, the reaction of the in situ intermediate bulk was not completed. The X-ray diffraction result detected a significant unreacted magnesium phase in the intermediate bulk. This work obtained joints of reacted MgB2 wires which can be considered for industrial MgB2 magnetic resonance imaging magnets fabrication.

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Note: Progress on the use of MgB2 superconducting joint technique for the development of MgB2 magnets for magnetic resonance imaging (MRI)

Cited by 10 publications

References 30 publications

MgB₂ Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

MgB₂ Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

Optimized superconducting MgB₂ joint made by IMD technique

Superconducting joints of reacted monofilament MgB₂ wires sintered by hot uniaxial pressing system

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Note: Progress on the use of MgB2 superconducting joint technique for the development of MgB2 magnets for magnetic resonance imaging (MRI)

Cited by 10 publications

References 30 publications

MgB2 Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

MgB2 Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

Optimized superconducting MgB2 joint made by IMD technique

Superconducting joints of reacted monofilament MgB2 wires sintered by hot uniaxial pressing system

Contact Info

Product

Resources

About

MgB₂ Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

MgB₂ Superconducting Joint Architecture with the Functionality to Screen External Magnetic Fields for MRI Magnet Applications

Optimized superconducting MgB₂ joint made by IMD technique

Superconducting joints of reacted monofilament MgB₂ wires sintered by hot uniaxial pressing system