Screening and Coupling Currents Induced Fields on a Large-Scale Prototype REBCO Insulated Coil
Abstract
The existence of screening currents is one large drawback coming from the use of REBCO (REBa2Cu3O7-x with RE standing for Rare Earth) tapes to develop superconducting coils. It not only alters the quality of the magnetic field but also implies losses and additional mechanical stresses on the tapes. The High Field Laboratory for Superconducting Materials (HFLSM) from Tohoku University, Japan, together with Toshiba® are now developing a 33T all-superconducting magnet, cooled by conduction, with a 19T Robust REBCO Insert. One important element of the design is a turn made of two-tape bundle and a turnto-turn insulation. In addition to the screening currents, magnetic field variations will induce coupling currents developing between these two REBCO tapes in direct contact. These coupling currents also affect the magnetic field quality. Recently, a large-scale prototype of this insert was manufactured to validate the mechanical design and the protection system in the event of local dissipation coming from defects in the tapes. This paper presents detailed behaviors of the screening currents and coupling currents induced fields obtained over this prototype focusing on the impact of some operating conditions such as the current ramping rate, applied-field history and temperature of operation. The magnetic field error, i.e. the difference between the measured magnetic field and the one obtained with a homogeneous current distribution, is the main tool used to carry out this study. It reached about 0.5 T and was significantly changed by the temperature of operation and the existence of previous magnetizations, as predicted by simulations results carried out by several groups.
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BibTeX
@article{zampa2026screening,
title = {{Screening and Coupling Currents Induced Fields on a Large-Scale Prototype REBCO Insulated Coil}},
author = {Alexandre Zampa and K. Takahashi and Y. Tsuchiya and T. Okada and S. Awaji and T. Uto and H. Takewa and S. Hanai and S. Ioka and J. Inagaki},
journal = {IEEE Transactions on Applied Superconductivity},
year = {2026},
month = oct,
doi = {10.1109/tasc.2023.3337060},
url = {https://hal.science/hal-05777255v1},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Screening and Coupling Currents Induced Fields on a Large-Scale Prototype REBCO Insulated Coil
AU - Alexandre Zampa
AU - K. Takahashi
AU - Y. Tsuchiya
AU - T. Okada
AU - S. Awaji
AU - T. Uto
AU - H. Takewa
AU - S. Hanai
AU - S. Ioka
AU - J. Inagaki
PY - 2026
DA - 2026/10/04
JO - IEEE Transactions on Applied Superconductivity
DO - 10.1109/tasc.2023.3337060
UR - https://hal.science/hal-05777255v1
AB - The existence of screening currents is one large drawback coming from the use of REBCO (REBa2Cu3O7-x with RE standing for Rare Earth) tapes to develop superconducting coils. It not only alters the quality of the magnetic field but also implies losses and additional mechanical stresses on the tapes. The High Field Laboratory for Superconducting Materials (HFLSM) from Tohoku University, Japan, together with Toshiba® are now developing a 33T all-superconducting magnet, cooled by conduction, with a 19T Robust REBCO Insert. One important element of the design is a turn made of two-tape bundle and a turnto-turn insulation. In addition to the screening currents, magnetic field variations will induce coupling currents developing between these two REBCO tapes in direct contact. These coupling currents also affect the magnetic field quality. Recently, a large-scale prototype of this insert was manufactured to validate the mechanical design and the protection system in the event of local dissipation coming from defects in the tapes. This paper presents detailed behaviors of the screening currents and coupling currents induced fields obtained over this prototype focusing on the impact of some operating conditions such as the current ramping rate, applied-field history and temperature of operation. The magnetic field error, i.e. the difference between the measured magnetic field and the one obtained with a homogeneous current distribution, is the main tool used to carry out this study. It reached about 0.5 T and was significantly changed by the temperature of operation and the existence of previous magnetizations, as predicted by simulations results carried out by several groups.
SN - 1051-8223
ER -