Investigation of multifilament MgB2 superconducting joint technique for development of MRI magnets

B. H. Yoo; J. C. Kim; Y. G. Kim; D. Y. Hwang; J. H. Lee; H. G. Lee

doi:10.1063/1.5040549

Investigation of multifilament MgB₂ superconducting joint technique for development of MRI magnets

B. H. Yoo, J. C. Kim, Y. G. Kim, D. Y. Hwang, J. H. Lee, H. G. Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

This study presents the investigation of superconducting joints fabricated using multifilament magnesium diboride (MgB₂) wires for the development of persistent-current mode magnetic resonance imaging (MRI) magnets. The critical current of the jointed samples decreased with increasing cutting angle because the smaller cutting angle allowed greater exposure of the MgB₂ filament, thereby increasing the contact area for the wire-bulk-wire connection. In addition, an appropriate pressing pressure (300 MPa) was necessary to establish the multifilament MgB₂ joint without significant degradation of superconducting properties. The resistance of the optimal MgB₂ joint, measured using the field-decay technique, was <1.5 × 10^-14 Ω. Therefore, the proposed joint technique can be employed for developing multifilament MgB₂ MRI magnets operating in the persistent-current mode.

Original language	English
Article number	094701
Journal	Review of Scientific Instruments
Volume	89
Issue number	9
DOIs	https://doi.org/10.1063/1.5040549
Publication status	Published - 2018 Sept 1

ASJC Scopus subject areas

Instrumentation

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title = "Investigation of multifilament MgB2 superconducting joint technique for development of MRI magnets",

abstract = "This study presents the investigation of superconducting joints fabricated using multifilament magnesium diboride (MgB2) wires for the development of persistent-current mode magnetic resonance imaging (MRI) magnets. The critical current of the jointed samples decreased with increasing cutting angle because the smaller cutting angle allowed greater exposure of the MgB2 filament, thereby increasing the contact area for the wire-bulk-wire connection. In addition, an appropriate pressing pressure (300 MPa) was necessary to establish the multifilament MgB2 joint without significant degradation of superconducting properties. The resistance of the optimal MgB2 joint, measured using the field-decay technique, was <1.5 × 10-14 Ω. Therefore, the proposed joint technique can be employed for developing multifilament MgB2 MRI magnets operating in the persistent-current mode.",

author = "Yoo, {B. H.} and Kim, {J. C.} and Kim, {Y. G.} and Hwang, {D. Y.} and Lee, {J. H.} and Lee, {H. G.}",

note = "Funding Information: This work was supported by the Materials and Components Technology Development Program of KEIT (No. 10053590, Development of MgB2 wire and coil with high critical current and long length for superconducting medical electric power equipment). Publisher Copyright: {\textcopyright} 2018 Author(s).",

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doi = "10.1063/1.5040549",

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AU - Yoo, B. H.

AU - Kim, J. C.

AU - Kim, Y. G.

AU - Hwang, D. Y.

AU - Lee, J. H.

AU - Lee, H. G.

N1 - Funding Information: This work was supported by the Materials and Components Technology Development Program of KEIT (No. 10053590, Development of MgB2 wire and coil with high critical current and long length for superconducting medical electric power equipment). Publisher Copyright: © 2018 Author(s).

PY - 2018/9/1

Y1 - 2018/9/1

N2 - This study presents the investigation of superconducting joints fabricated using multifilament magnesium diboride (MgB2) wires for the development of persistent-current mode magnetic resonance imaging (MRI) magnets. The critical current of the jointed samples decreased with increasing cutting angle because the smaller cutting angle allowed greater exposure of the MgB2 filament, thereby increasing the contact area for the wire-bulk-wire connection. In addition, an appropriate pressing pressure (300 MPa) was necessary to establish the multifilament MgB2 joint without significant degradation of superconducting properties. The resistance of the optimal MgB2 joint, measured using the field-decay technique, was <1.5 × 10-14 Ω. Therefore, the proposed joint technique can be employed for developing multifilament MgB2 MRI magnets operating in the persistent-current mode.

AB - This study presents the investigation of superconducting joints fabricated using multifilament magnesium diboride (MgB2) wires for the development of persistent-current mode magnetic resonance imaging (MRI) magnets. The critical current of the jointed samples decreased with increasing cutting angle because the smaller cutting angle allowed greater exposure of the MgB2 filament, thereby increasing the contact area for the wire-bulk-wire connection. In addition, an appropriate pressing pressure (300 MPa) was necessary to establish the multifilament MgB2 joint without significant degradation of superconducting properties. The resistance of the optimal MgB2 joint, measured using the field-decay technique, was <1.5 × 10-14 Ω. Therefore, the proposed joint technique can be employed for developing multifilament MgB2 MRI magnets operating in the persistent-current mode.

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

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ER -

Investigation of multifilament MgB₂ superconducting joint technique for development of MRI magnets

Abstract

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