Decay of Shielding Current in Stacked REBCO Superconducting Tapes

Masataka Iwakuma, T. Ueno, K. Yun, S. Sato, K. Yoshida, A. Tomioka, T. Izumi, T. Machi, A. Ibi, K. Adachi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We are developing superconducting magnets for MRI with Re1Ba2Cu3O7-δ (Re: rare earth, Y, Gd, Eu, REBCO) tapes. Superconducting magnets for MRI need the uniformity of the produced magnetic field in time and space. The disturbance is mainly caused by the induced shielding current in the wound superconducting tapes, which corresponds to the magnetization of the REBCO superconducting tapes. We have made a test coil with REBCO tapes and evaluated the influence of the shielding current on the produced magnetic field. In this paper, applying external magnetic field perpendicular to the EuBCO superconducting tape face, we investigated the magnetization and its relaxation properties of the tapes at 20-40 K using a saddle-shaped pickup coil. Increasing an applied magnetic field and interrupting the field sweep temporarily at 0, 0.5, 1, 1.5, 2, and 2.5 T, we observed the variation of the magnetization for each step of magnetic field. The magnetization decayed at a speed of a few to tens of percent per minute. It was faster beyond expectation. The relaxation rate of the magnetization depended on magnetic field, temperature, and the number of stacked tapes. It became faster with increasing temperature and magnetic field and with decreasing number of stacked tapes.

Original languageEnglish
Article number7364203
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number4
DOIs
Publication statusPublished - Jun 1 2016

Fingerprint

Superconducting tapes
Shielding
tapes
shielding
Magnetic fields
Tapes
Magnetization
decay
magnetic fields
magnetization
Superconducting magnets
Magnetic resonance imaging
superconducting magnets
coils
Pickups
saddles
Rare earths
Temperature distribution
temperature distribution
disturbances

All Science Journal Classification (ASJC) codes

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

Cite this

Decay of Shielding Current in Stacked REBCO Superconducting Tapes. / Iwakuma, Masataka; Ueno, T.; Yun, K.; Sato, S.; Yoshida, K.; Tomioka, A.; Izumi, T.; Machi, T.; Ibi, A.; Adachi, K.

In: IEEE Transactions on Applied Superconductivity, Vol. 26, No. 4, 7364203, 01.06.2016.

Research output: Contribution to journalArticle

Iwakuma, M, Ueno, T, Yun, K, Sato, S, Yoshida, K, Tomioka, A, Izumi, T, Machi, T, Ibi, A & Adachi, K 2016, 'Decay of Shielding Current in Stacked REBCO Superconducting Tapes', IEEE Transactions on Applied Superconductivity, vol. 26, no. 4, 7364203. https://doi.org/10.1109/TASC.2015.2511455
Iwakuma, Masataka ; Ueno, T. ; Yun, K. ; Sato, S. ; Yoshida, K. ; Tomioka, A. ; Izumi, T. ; Machi, T. ; Ibi, A. ; Adachi, K. / Decay of Shielding Current in Stacked REBCO Superconducting Tapes. In: IEEE Transactions on Applied Superconductivity. 2016 ; Vol. 26, No. 4.
@article{6fe74edd7798400a8e905d8b58d342e6,
title = "Decay of Shielding Current in Stacked REBCO Superconducting Tapes",
abstract = "We are developing superconducting magnets for MRI with Re1Ba2Cu3O7-δ (Re: rare earth, Y, Gd, Eu, REBCO) tapes. Superconducting magnets for MRI need the uniformity of the produced magnetic field in time and space. The disturbance is mainly caused by the induced shielding current in the wound superconducting tapes, which corresponds to the magnetization of the REBCO superconducting tapes. We have made a test coil with REBCO tapes and evaluated the influence of the shielding current on the produced magnetic field. In this paper, applying external magnetic field perpendicular to the EuBCO superconducting tape face, we investigated the magnetization and its relaxation properties of the tapes at 20-40 K using a saddle-shaped pickup coil. Increasing an applied magnetic field and interrupting the field sweep temporarily at 0, 0.5, 1, 1.5, 2, and 2.5 T, we observed the variation of the magnetization for each step of magnetic field. The magnetization decayed at a speed of a few to tens of percent per minute. It was faster beyond expectation. The relaxation rate of the magnetization depended on magnetic field, temperature, and the number of stacked tapes. It became faster with increasing temperature and magnetic field and with decreasing number of stacked tapes.",
author = "Masataka Iwakuma and T. Ueno and K. Yun and S. Sato and K. Yoshida and A. Tomioka and T. Izumi and T. Machi and A. Ibi and K. Adachi",
year = "2016",
month = "6",
day = "1",
doi = "10.1109/TASC.2015.2511455",
language = "English",
volume = "26",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

TY - JOUR

T1 - Decay of Shielding Current in Stacked REBCO Superconducting Tapes

AU - Iwakuma, Masataka

AU - Ueno, T.

AU - Yun, K.

AU - Sato, S.

AU - Yoshida, K.

AU - Tomioka, A.

AU - Izumi, T.

AU - Machi, T.

AU - Ibi, A.

AU - Adachi, K.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - We are developing superconducting magnets for MRI with Re1Ba2Cu3O7-δ (Re: rare earth, Y, Gd, Eu, REBCO) tapes. Superconducting magnets for MRI need the uniformity of the produced magnetic field in time and space. The disturbance is mainly caused by the induced shielding current in the wound superconducting tapes, which corresponds to the magnetization of the REBCO superconducting tapes. We have made a test coil with REBCO tapes and evaluated the influence of the shielding current on the produced magnetic field. In this paper, applying external magnetic field perpendicular to the EuBCO superconducting tape face, we investigated the magnetization and its relaxation properties of the tapes at 20-40 K using a saddle-shaped pickup coil. Increasing an applied magnetic field and interrupting the field sweep temporarily at 0, 0.5, 1, 1.5, 2, and 2.5 T, we observed the variation of the magnetization for each step of magnetic field. The magnetization decayed at a speed of a few to tens of percent per minute. It was faster beyond expectation. The relaxation rate of the magnetization depended on magnetic field, temperature, and the number of stacked tapes. It became faster with increasing temperature and magnetic field and with decreasing number of stacked tapes.

AB - We are developing superconducting magnets for MRI with Re1Ba2Cu3O7-δ (Re: rare earth, Y, Gd, Eu, REBCO) tapes. Superconducting magnets for MRI need the uniformity of the produced magnetic field in time and space. The disturbance is mainly caused by the induced shielding current in the wound superconducting tapes, which corresponds to the magnetization of the REBCO superconducting tapes. We have made a test coil with REBCO tapes and evaluated the influence of the shielding current on the produced magnetic field. In this paper, applying external magnetic field perpendicular to the EuBCO superconducting tape face, we investigated the magnetization and its relaxation properties of the tapes at 20-40 K using a saddle-shaped pickup coil. Increasing an applied magnetic field and interrupting the field sweep temporarily at 0, 0.5, 1, 1.5, 2, and 2.5 T, we observed the variation of the magnetization for each step of magnetic field. The magnetization decayed at a speed of a few to tens of percent per minute. It was faster beyond expectation. The relaxation rate of the magnetization depended on magnetic field, temperature, and the number of stacked tapes. It became faster with increasing temperature and magnetic field and with decreasing number of stacked tapes.

UR - http://www.scopus.com/inward/record.url?scp=84973140745&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84973140745&partnerID=8YFLogxK

U2 - 10.1109/TASC.2015.2511455

DO - 10.1109/TASC.2015.2511455

M3 - Article

VL - 26

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 4

M1 - 7364203

ER -