Relaxation of Shielding Current in Test Coils for MRI with REBCO Superconducting Scribed Tapes

Masataka Iwakuma, Y. Tsukigi, K. Nabekura, T. Ueno, R. Shindo, F. Kawahara, S. Honda, K. Tamura, K. Yun, S. Sato, K. Yoshida, A. Tomioka, M. Konno, T. Izumi, T. Machi, A. Ibi

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Superconducting magnets for MRI need uniformity of produced magnetic field within ppm order in time and space. To develop the superconducting magnets for MRI operating in subcooled liquid nitrogen at 65 K, two pieces of small test coils were fabricated with Re1Ba2Cu3O7-δ (REBCO, Re: Rare Earth such as Y, Gd, and Eu) superconducting tapes. One was wound with a nonscribed tape and the other was with a laser-scribed tape into a four-filament structure. Each test coil was inserted inside a NbTi superconducting magnet. After bath cooling, the test coil with subcooled liquid nitrogen and applying a dc bias magnetic field of 0.5-2 T, transport current was applied step by step, and the variation of magnetic field at the coil center was observed by a Hall probe with high accuracy. Although magnetic field followed the variation of transport current with a delay in the respective coils, the drastic difference between them was revealed. It was demonstrated that the influence of the induced shielding current on the produced magnetic field was drastically reduced by scribing. Not only the magnitude of shielding current but also the decay time constant was reduced by scribing. The produced magnetic field of the test coil with the scribed tape reached to a target one in a short time as programmed. Scribing REBCO tapes brought about faster relaxation of magnetization.

元の言語英語
記事番号7434597
ジャーナルIEEE Transactions on Applied Superconductivity
26
発行部数3
DOI
出版物ステータス出版済み - 4 1 2016

Fingerprint

Superconducting tapes
Shielding
Magnetic resonance imaging
tapes
shielding
coils
Magnetic fields
Tapes
scoring
Superconducting magnets
superconducting magnets
magnetic fields
Liquid nitrogen
liquid nitrogen
Rare earths
time constant
baths
Magnetization
filaments
rare earth elements

All Science Journal Classification (ASJC) codes

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

これを引用

Relaxation of Shielding Current in Test Coils for MRI with REBCO Superconducting Scribed Tapes. / Iwakuma, Masataka; Tsukigi, Y.; Nabekura, K.; Ueno, T.; Shindo, R.; Kawahara, F.; Honda, S.; Tamura, K.; Yun, K.; Sato, S.; Yoshida, K.; Tomioka, A.; Konno, M.; Izumi, T.; Machi, T.; Ibi, A.

:: IEEE Transactions on Applied Superconductivity, 巻 26, 番号 3, 7434597, 01.04.2016.

研究成果: ジャーナルへの寄稿記事

Iwakuma, M, Tsukigi, Y, Nabekura, K, Ueno, T, Shindo, R, Kawahara, F, Honda, S, Tamura, K, Yun, K, Sato, S, Yoshida, K, Tomioka, A, Konno, M, Izumi, T, Machi, T & Ibi, A 2016, 'Relaxation of Shielding Current in Test Coils for MRI with REBCO Superconducting Scribed Tapes', IEEE Transactions on Applied Superconductivity, 巻. 26, 番号 3, 7434597. https://doi.org/10.1109/TASC.2016.2535178
Iwakuma, Masataka ; Tsukigi, Y. ; Nabekura, K. ; Ueno, T. ; Shindo, R. ; Kawahara, F. ; Honda, S. ; Tamura, K. ; Yun, K. ; Sato, S. ; Yoshida, K. ; Tomioka, A. ; Konno, M. ; Izumi, T. ; Machi, T. ; Ibi, A. / Relaxation of Shielding Current in Test Coils for MRI with REBCO Superconducting Scribed Tapes. :: IEEE Transactions on Applied Superconductivity. 2016 ; 巻 26, 番号 3.
@article{076798206153487b9d8b0f29575fa861,
title = "Relaxation of Shielding Current in Test Coils for MRI with REBCO Superconducting Scribed Tapes",
abstract = "Superconducting magnets for MRI need uniformity of produced magnetic field within ppm order in time and space. To develop the superconducting magnets for MRI operating in subcooled liquid nitrogen at 65 K, two pieces of small test coils were fabricated with Re1Ba2Cu3O7-δ (REBCO, Re: Rare Earth such as Y, Gd, and Eu) superconducting tapes. One was wound with a nonscribed tape and the other was with a laser-scribed tape into a four-filament structure. Each test coil was inserted inside a NbTi superconducting magnet. After bath cooling, the test coil with subcooled liquid nitrogen and applying a dc bias magnetic field of 0.5-2 T, transport current was applied step by step, and the variation of magnetic field at the coil center was observed by a Hall probe with high accuracy. Although magnetic field followed the variation of transport current with a delay in the respective coils, the drastic difference between them was revealed. It was demonstrated that the influence of the induced shielding current on the produced magnetic field was drastically reduced by scribing. Not only the magnitude of shielding current but also the decay time constant was reduced by scribing. The produced magnetic field of the test coil with the scribed tape reached to a target one in a short time as programmed. Scribing REBCO tapes brought about faster relaxation of magnetization.",
author = "Masataka Iwakuma and Y. Tsukigi and K. Nabekura and T. Ueno and R. Shindo and F. Kawahara and S. Honda and K. Tamura and K. Yun and S. Sato and K. Yoshida and A. Tomioka and M. Konno and T. Izumi and T. Machi and A. Ibi",
year = "2016",
month = "4",
day = "1",
doi = "10.1109/TASC.2016.2535178",
language = "English",
volume = "26",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "3",

}

TY - JOUR

T1 - Relaxation of Shielding Current in Test Coils for MRI with REBCO Superconducting Scribed Tapes

AU - Iwakuma, Masataka

AU - Tsukigi, Y.

AU - Nabekura, K.

AU - Ueno, T.

AU - Shindo, R.

AU - Kawahara, F.

AU - Honda, S.

AU - Tamura, K.

AU - Yun, K.

AU - Sato, S.

AU - Yoshida, K.

AU - Tomioka, A.

AU - Konno, M.

AU - Izumi, T.

AU - Machi, T.

AU - Ibi, A.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - Superconducting magnets for MRI need uniformity of produced magnetic field within ppm order in time and space. To develop the superconducting magnets for MRI operating in subcooled liquid nitrogen at 65 K, two pieces of small test coils were fabricated with Re1Ba2Cu3O7-δ (REBCO, Re: Rare Earth such as Y, Gd, and Eu) superconducting tapes. One was wound with a nonscribed tape and the other was with a laser-scribed tape into a four-filament structure. Each test coil was inserted inside a NbTi superconducting magnet. After bath cooling, the test coil with subcooled liquid nitrogen and applying a dc bias magnetic field of 0.5-2 T, transport current was applied step by step, and the variation of magnetic field at the coil center was observed by a Hall probe with high accuracy. Although magnetic field followed the variation of transport current with a delay in the respective coils, the drastic difference between them was revealed. It was demonstrated that the influence of the induced shielding current on the produced magnetic field was drastically reduced by scribing. Not only the magnitude of shielding current but also the decay time constant was reduced by scribing. The produced magnetic field of the test coil with the scribed tape reached to a target one in a short time as programmed. Scribing REBCO tapes brought about faster relaxation of magnetization.

AB - Superconducting magnets for MRI need uniformity of produced magnetic field within ppm order in time and space. To develop the superconducting magnets for MRI operating in subcooled liquid nitrogen at 65 K, two pieces of small test coils were fabricated with Re1Ba2Cu3O7-δ (REBCO, Re: Rare Earth such as Y, Gd, and Eu) superconducting tapes. One was wound with a nonscribed tape and the other was with a laser-scribed tape into a four-filament structure. Each test coil was inserted inside a NbTi superconducting magnet. After bath cooling, the test coil with subcooled liquid nitrogen and applying a dc bias magnetic field of 0.5-2 T, transport current was applied step by step, and the variation of magnetic field at the coil center was observed by a Hall probe with high accuracy. Although magnetic field followed the variation of transport current with a delay in the respective coils, the drastic difference between them was revealed. It was demonstrated that the influence of the induced shielding current on the produced magnetic field was drastically reduced by scribing. Not only the magnitude of shielding current but also the decay time constant was reduced by scribing. The produced magnetic field of the test coil with the scribed tape reached to a target one in a short time as programmed. Scribing REBCO tapes brought about faster relaxation of magnetization.

UR - http://www.scopus.com/inward/record.url?scp=84963830613&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84963830613&partnerID=8YFLogxK

U2 - 10.1109/TASC.2016.2535178

DO - 10.1109/TASC.2016.2535178

M3 - Article

VL - 26

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 3

M1 - 7434597

ER -