Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors

Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shin Ichi Urayama, Hidenao Fukuyama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.

Original languageEnglish
Article number7835760
JournalIEEE Transactions on Applied Superconductivity
Volume27
Issue number4
DOIs
Publication statusPublished - Jun 1 2017

Fingerprint

Induced currents
Magnets
Screening
magnets
screening
conductors
Magnetic fields
conduction
magnetic fields
coils
Superconducting magnets
superconducting magnets
Magnetic resonance
Imaging systems
homogeneity
magnetic resonance

Keywords

  • conduction-cooled
  • REBCO-coated conductor
  • Screening-current-induced magnetic field

ASJC Scopus subject areas

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

Cite this

Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors. / Miyazaki, Hiroshi; Iwai, Sadanori; Uto, Tatsuro; Otani, Yasumi; Takahashi, Masahiko; Tosaka, Taizo; Tasaki, Kenji; Nomura, Shunji; Kurusu, Tsutomu; Ueda, Hiroshi; Noguchi, So; Ishiyama, Atsushi; Urayama, Shin Ichi; Fukuyama, Hidenao.

In: IEEE Transactions on Applied Superconductivity, Vol. 27, No. 4, 7835760, 01.06.2017.

Research output: Contribution to journalArticle

Miyazaki, H, Iwai, S, Uto, T, Otani, Y, Takahashi, M, Tosaka, T, Tasaki, K, Nomura, S, Kurusu, T, Ueda, H, Noguchi, S, Ishiyama, A, Urayama, SI & Fukuyama, H 2017, 'Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors', IEEE Transactions on Applied Superconductivity, vol. 27, no. 4, 7835760. https://doi.org/10.1109/TASC.2017.2657636
Miyazaki, Hiroshi ; Iwai, Sadanori ; Uto, Tatsuro ; Otani, Yasumi ; Takahashi, Masahiko ; Tosaka, Taizo ; Tasaki, Kenji ; Nomura, Shunji ; Kurusu, Tsutomu ; Ueda, Hiroshi ; Noguchi, So ; Ishiyama, Atsushi ; Urayama, Shin Ichi ; Fukuyama, Hidenao. / Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors. In: IEEE Transactions on Applied Superconductivity. 2017 ; Vol. 27, No. 4.
@article{a1fa60be0ebc4be48479fbb9fda2ad09,
title = "Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors",
abstract = "Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.",
keywords = "conduction-cooled, REBCO-coated conductor, Screening-current-induced magnetic field",
author = "Hiroshi Miyazaki and Sadanori Iwai and Tatsuro Uto and Yasumi Otani and Masahiko Takahashi and Taizo Tosaka and Kenji Tasaki and Shunji Nomura and Tsutomu Kurusu and Hiroshi Ueda and So Noguchi and Atsushi Ishiyama and Urayama, {Shin Ichi} and Hidenao Fukuyama",
year = "2017",
month = "6",
day = "1",
doi = "10.1109/TASC.2017.2657636",
language = "English",
volume = "27",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

TY - JOUR

T1 - Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors

AU - Miyazaki, Hiroshi

AU - Iwai, Sadanori

AU - Uto, Tatsuro

AU - Otani, Yasumi

AU - Takahashi, Masahiko

AU - Tosaka, Taizo

AU - Tasaki, Kenji

AU - Nomura, Shunji

AU - Kurusu, Tsutomu

AU - Ueda, Hiroshi

AU - Noguchi, So

AU - Ishiyama, Atsushi

AU - Urayama, Shin Ichi

AU - Fukuyama, Hidenao

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.

AB - Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.

KW - conduction-cooled

KW - REBCO-coated conductor

KW - Screening-current-induced magnetic field

UR - http://www.scopus.com/inward/record.url?scp=85015056916&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85015056916&partnerID=8YFLogxK

U2 - 10.1109/TASC.2017.2657636

DO - 10.1109/TASC.2017.2657636

M3 - Article

VL - 27

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 4

M1 - 7835760

ER -