Designs and tests of shaking coils to reduce screening currents induced in HTS insert coils for NMR magnet

Kazuhiro Kajikawa; Gwendolyn V. Gettliffe; Yong Chu; Daisuke Miyagi; Thibault P. Lécrevisse; Seungyong Hahn; Juan Bascuñán; Yukikazu Iwasa

doi:10.1109/TASC.2014.2363495

Designs and tests of shaking coils to reduce screening currents induced in HTS insert coils for NMR magnet

Kazuhiro Kajikawa, Gwendolyn V. Gettliffe, Yong Chu, Daisuke Miyagi, Thibault P. Lécrevisse, Seungyong Hahn, Juan Bascuñán, Yukikazu Iwasa

ENG - Electrical Engineering

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

27 Citations (Scopus)

Abstract

Two types of shaking coils are focused on reducing screening currents induced in solenoid coils wound with high-temperature superconducting (HTS) tapes. One is a pair of copper shaking coils coaxially located inside and outside the HTS coil to apply an ac magnetic field in the axial direction. The other is an HTS shaking coil with notch located only outside the HTS coil to minimize the radial components of local ac fields applied to windings of the HTS coil as small as possible. It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium. The effectiveness of the HTS shaking coil to reduce screening-current-induced fields generated by another magnetized HTS coil is also experimentally validated in liquid nitrogen using a commercially available coated conductor with narrow width.

Original language	English
Article number	6926807
Journal	IEEE Transactions on Applied Superconductivity
Volume	25
Issue number	3
DOIs	https://doi.org/10.1109/TASC.2014.2363495
Publication status	Published - 2015 Jun 1

Keywords

AC magnetic field
HTS wires
screening current
shaking coils

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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Designs and tests of shaking coils to reduce screening currents induced in HTS insert coils for NMR magnet. / Kajikawa, Kazuhiro; Gettliffe, Gwendolyn V.; Chu, Yong; Miyagi, Daisuke; Lécrevisse, Thibault P.; Hahn, Seungyong; Bascuñán, Juan; Iwasa, Yukikazu.

In: IEEE Transactions on Applied Superconductivity, Vol. 25, No. 3, 6926807, 01.06.2015.

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

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abstract = "Two types of shaking coils are focused on reducing screening currents induced in solenoid coils wound with high-temperature superconducting (HTS) tapes. One is a pair of copper shaking coils coaxially located inside and outside the HTS coil to apply an ac magnetic field in the axial direction. The other is an HTS shaking coil with notch located only outside the HTS coil to minimize the radial components of local ac fields applied to windings of the HTS coil as small as possible. It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium. The effectiveness of the HTS shaking coil to reduce screening-current-induced fields generated by another magnetized HTS coil is also experimentally validated in liquid nitrogen using a commercially available coated conductor with narrow width.",

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AU - Kajikawa, Kazuhiro

AU - Gettliffe, Gwendolyn V.

AU - Chu, Yong

AU - Miyagi, Daisuke

AU - Lécrevisse, Thibault P.

AU - Hahn, Seungyong

AU - Bascuñán, Juan

AU - Iwasa, Yukikazu

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Y1 - 2015/6/1

N2 - Two types of shaking coils are focused on reducing screening currents induced in solenoid coils wound with high-temperature superconducting (HTS) tapes. One is a pair of copper shaking coils coaxially located inside and outside the HTS coil to apply an ac magnetic field in the axial direction. The other is an HTS shaking coil with notch located only outside the HTS coil to minimize the radial components of local ac fields applied to windings of the HTS coil as small as possible. It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium. The effectiveness of the HTS shaking coil to reduce screening-current-induced fields generated by another magnetized HTS coil is also experimentally validated in liquid nitrogen using a commercially available coated conductor with narrow width.

AB - Two types of shaking coils are focused on reducing screening currents induced in solenoid coils wound with high-temperature superconducting (HTS) tapes. One is a pair of copper shaking coils coaxially located inside and outside the HTS coil to apply an ac magnetic field in the axial direction. The other is an HTS shaking coil with notch located only outside the HTS coil to minimize the radial components of local ac fields applied to windings of the HTS coil as small as possible. It is found that the copper shaking coils yield the allowable amount of power dissipation in liquid helium. The effectiveness of the HTS shaking coil to reduce screening-current-induced fields generated by another magnetized HTS coil is also experimentally validated in liquid nitrogen using a commercially available coated conductor with narrow width.

KW - AC magnetic field

KW - HTS wires

KW - screening current

KW - shaking coils

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Designs and tests of shaking coils to reduce screening currents induced in HTS insert coils for NMR magnet

Abstract

Keywords

ASJC Scopus subject areas

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