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

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26 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 languageEnglish
Article number6926807
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - Jun 1 2015

All Science Journal Classification (ASJC) codes

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

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    Kajikawa, K., Gettliffe, G. V., Chu, Y., Miyagi, D., Lécrevisse, T. P., Hahn, S., Bascuñán, J., & Iwasa, Y. (2015). Designs and tests of shaking coils to reduce screening currents induced in HTS insert coils for NMR magnet. IEEE Transactions on Applied Superconductivity, 25(3), [6926807]. https://doi.org/10.1109/TASC.2014.2363495