Evaluation of a solid nitrogen impregnated MgB<sub>2</sub> racetrack coil

Patel, Dipak; Qiu, Wenbin; Mustapić, Mislav; Knott, Jonathan C.; Ma, Zongqing; Gajda, D.; Shahabuddin, Mohammed; Xu, Jiasheng; Choi, Seyong; Tomsic, M.; Dou, Shi Xue; Yamauchi, Yusuke; Kim, Jung Ho; Hossain, Md. Shahriar A.

doi:10.1088/1361-6668/aad9e0

Cited by 26 publications

(5 citation statements)

References 48 publications

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“…The C-doped multifilament MgB 2 wire manufactured using the in situ process was utilized for fabricating the joints. ,, The field-dependent I c (s) of the MgB 2 wire at 20 K are shown in Figure with a cross-sectional optical image of the wire. The specifications of the MgB 2 wire are listed in Table S1 in the Supporting Information.…”

Section: Methodsmentioning

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: Methodsmentioning

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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“…These attributes can be surprisingly fulfilled for solid nitrogen (SN 2 ). There are several studies where extensive IV characterizations of short MgB 2 samples and HTS coils were performed [14][15][16]. In [17] the authors investigate the application of SN 2 cooling for HTS current limiter, their results indicate the insufficient thermal contact between SN 2 and HTS superconductor.…”

Section: Introductionmentioning

confidence: 99%

Transport measurement of MgB₂ wire under the sub-cooled water ice compared to other cooling conditions

Búran¹,

Kopera²,

Kòváč³

2022

Supercond. Sci. Technol.

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The standard DC transport measurement of MgB2 composite conductor was done in vacuum, low pressure helium gas, sub-cooled solid nitrogen and water ice. The effect of these coolants on electro-thermal behaviour was studied at self-field and temperature range from 32 K to 36.5 K. The obtained results show that even small volume of Helium gas enhances the sample thermal stability during the I-V measurement in comparison to those obtained in vacuum. The cooling by solid nitrogen improves the sample stability in contrast to helium gas. The measurement performed in water ice exhibits an excellent and stable behavior of superconducting wire carrying high transport current below and above the quench as well. Consequently, water ice shows simple, safe and promising He-free mode of cooling for future superconducting systems.

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“…However, to date, most of the MgB 2 applications are limited to demonstrators generating magnetic fields of up to 5 T at an operating temperature of 10 to 25 K [1]. So far, the global ongoing or completed projects based on MgB 2 superconductors can be roughly divided into two categories: high current cables [2,3] and superconducting magnet coils [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Gao¹,

He²,

Ma³

et al. 2022

Nucl. Fusion

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Given the low price and relatively high transition temperature (39 K) of MgB2 conductor, MgB2-based superconductors are a potential candidate for the lower field fusion coils, such as Poloidal Field (PF) coils, Correction Coils (CC) and Feeders. However, to date, the application of MgB2 is limited to demonstrators in a low magnetic field of up to 5 T and at temperatures of up to 10 to 20 K, relying on cryogen-free, helium gas or liquid hydrogen cooling, which significantly reduce the cost of cryogenic systems. To demonstrate the feasibility and performance verification of large size MgB2 PF conductors based on ITER and CFETR requirements, a 4th-stage subsize MgB2 Cable-In-Conduit Conductor (CICC) cable sample is made at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The CICC contains 96 in-situ MgB2 superconducting wires, manufactured by Western Superconducting Technology Ltd. (WST) and 48 copper wires. The critical current of the sub-size cables and MgB2 witness wires are examined with different background magnetic fields at 4.2 K. In addition, the AC loss is measured utilizing magnetization and calorimetric methods. To further clarify the influence of electromagnetic force on the AC loss performance, the cable sample is pressed transversely at room temperature and then inserted into a dipole magnet for AC loss measurement at 4.2 K. The critical current at 4.2 K of the subsize MgB2 CICC cable shows 20% degradation compared to the witness wires at 2 T background magnetic field. However, no further critical current degradation is visible during ramping up and down the magnetic field. The coupling loss time constant for 1 T background magnetic field amounts to 480 ms. No significant effect of the applied transverse stress on the coupling loss is observed between 0 and 10 MPa.

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Evaluation of a solid nitrogen impregnated MgB₂ racetrack coil

Cited by 26 publications

References 48 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

Transport measurement of MgB₂ wire under the sub-cooled water ice compared to other cooling conditions

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

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Evaluation of a solid nitrogen impregnated MgB2 racetrack coil

Cited by 26 publications

References 48 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

Transport measurement of MgB2 wire under the sub-cooled water ice compared to other cooling conditions

DC performance and AC loss of sub-size MgB2 CICC conductor for fusion magnet application

Contact Info

Product

Resources

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Evaluation of a solid nitrogen impregnated MgB₂ racetrack coil

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

Transport measurement of MgB₂ wire under the sub-cooled water ice compared to other cooling conditions

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application