A Novel Method to Eliminate the Screening Current–Induced Magnetic Field in a Non-insulated REBCO Double Pancake Coil

  • Lei Wang
  • Qiuliang WangEmail author
  • Lang Qin
  • Kangshuai Wang
  • Jianhua Liu
  • Xinning Hu
Original Paper


The screening current–induced magnetic field (SCIF) brings bad effects on the field quality of REBCO high-temperature superconducting (HTS) magnet, which is mainly due to its specific large aspect ratio structure. In this paper, numerical simulation and experiments were conducted to investigate SCIF in a non-insulated HTS DP coil firstly. Then, a heating flux method was proposed to help eliminate the effect of screening current in a GdBCO HTS double pancake (DP) coil. A heating plate was mounted under the DP coil and used to generate a heating flux, which could increase the temperature and decrease critical current of the HTS coil in a short time. The decreasing of critical current could reduce the margin left for the screening current and eliminate the effect of SCIF further more. Heating flux experiments were performed to verify its effects on eliminating SCIF in the DP coil at the end. The results show that the SCIF could be reduced obviously by the method of heating flux. The research provides an important reference to eliminate SCIF in the HTS magnet.


Screening current Heating flux Non-insulated GdBCO HTS coil 


Funding Information

This work was supported by the Beijing Natural Science Foundation (3184061) and National Natural Science Foundation of China (51807191).


  1. 1.
    Miyazeo, A.: Magnetic field induced by screening current in short and straight coated conductors. IEEE Trans Appl Supercond. 20, 1557–1560 (2010)ADSCrossRefGoogle Scholar
  2. 2.
    Wang, Q.L.: Practical Design of Magnetostatic Structure Using Numerical Simulation. Wiley, Hoboken, NJ, USA (2013)CrossRefGoogle Scholar
  3. 3.
    Uglient, D.: Measurements of magnetic field induced by screening currents in YBCO solenoid cois. Supercond Sci Technol. 23, 11 (2010)Google Scholar
  4. 4.
    Amemiya, N., Akachi, K.: Magnetic field generated by shielding current in high Tc superconducting coils for NMR magnets. Supercond Sci Technol. 21, 9 (2008)CrossRefGoogle Scholar
  5. 5.
    Maeda, H.: Recent developments in high-temperature superconducting magnet technology (review). IEEE Trans Appl Supercond. 24, 1–12 (2014)CrossRefGoogle Scholar
  6. 6.
    Koyama, Y.: Towards beyond 1 GHz NMR: mechanism of the long-term drift of screening current-induced magnetic field in a Bi-2223 coil. Physica C. 469, 694–701 (2009)ADSCrossRefGoogle Scholar
  7. 7.
    Yang, D.G.: Screening current-induced field in non-insulated GdBCO pancake coil. Supercond Sci Technol. 26, 3 (2013)CrossRefGoogle Scholar
  8. 8.
    Ahn, M.: Spatial and temporal variations of a screening current induced magnetic field in a double pancake HTS insert of an LTS/HTS NMR magnet. IEEE Trans Appl Supercond. 19, 2269–2272 (2009)ADSCrossRefGoogle Scholar
  9. 9.
    Yanagisawa, Y.: Magnitude of the screening field for YBCO coils. IEEE Trans Appl Supercond. 21, 1640–1643 (2011)ADSCrossRefGoogle Scholar
  10. 10.
    Itoh, R., Oga, Y., Noguchi, S., Igarashi, H.: Screening current simulation inside YBCO tape in charging YBCO magnet. IEEE Trans Appl Supercond. 23, 3 (2013)CrossRefGoogle Scholar
  11. 11.
    Wang, L., Wang, Q.: Analysis of current and magnetic distributions in REBCO superconducting coated conductors in self- and external fields. J Supercond Nov Magn. 27, 1159–1166 (2014)CrossRefGoogle Scholar
  12. 12.
    Brandt, E.H.: Thin superconductors in a perpendicular magnetic ac field: general formulation and strip geometry. Phys Rev B. 49, 9024–9040 (1994)ADSCrossRefGoogle Scholar
  13. 13.
    Brandt, E.H.: Superconductors of finite thickness in a perpendicular magnetic field: strips and slabs. Phys Rev B. 54, 4246–4264 (1996)ADSCrossRefGoogle Scholar
  14. 14.
    Yazawa, T.: Numerical calculation of current density distributions in high temperature superconducting tapes with finite thickness in self field and external field. Physica C. 310(1–4), 36–41 (1998)ADSCrossRefGoogle Scholar
  15. 15.
    Matsumi, A.: Evaluation of irregular magnetic field generated by screening current in REBCO coils for high accuracy field. IEEE Trans Appl Supercond. 26, 4 (2016)CrossRefGoogle Scholar
  16. 16.
    Mochida, A.: Evaluation of magnetic field distribution by screening current in multiple REBCO coils. IEEE Trans Appl Supercond. 26, 4 (2016)CrossRefGoogle Scholar
  17. 17.
    Hahn, S.: Field mapping, NMR lineshape, and screening currents induced field analyses for homogeneity improvement in LTS/HTS NMR magnets. IEEE Trans Appl Supercond. 18, 856–859 (2008)ADSCrossRefGoogle Scholar
  18. 18.
    Passi, J., Lehtonen, J., Lahtinen, M., Kettunen, L.: Physica C. 310, 62 (1998)ADSCrossRefGoogle Scholar
  19. 19.
    Yanagisawa, Y.: Effect of current sweep reversal on the magnetic field stability for a Bi-2223 superconducting solenoid. Physica C. 469, 1996–1999 (2009)ADSCrossRefGoogle Scholar
  20. 20.
    Kajikawa, K.: Designs and tests of shaking coils to reduce screening currents induced in HTS insert coils for NMR magnet. IEEE Trans Appl Supercond. 25, 3 (2015)CrossRefGoogle Scholar
  21. 21.
    Ueda, H.: Reduction of irregular magnetic field generated by screening current in REBCO coil. IEEE Trans Appl Supercond. 25, 3 (2015)CrossRefGoogle Scholar
  22. 22.
    Kajikawa, K.: A simple method to eliminate shielding currents for magnetization perpendicular to superconducting tapes wound into coils. Supercond Sci Technol. 24, 12 (2011)CrossRefGoogle Scholar
  23. 23.
    Zeldov, E.: Magnetization and transport currents in thin superconducting films. Phys Rev B. 49, 9802–9822 (1994)ADSCrossRefGoogle Scholar
  24. 24.
    Wang, L.: Screening current-induced magnetic field in a noninsulated GdBCO HTS coil for a 24 T all-superconducting magnet. EEE Trans Appl Supercond. 27, 4 (2017)CrossRefGoogle Scholar
  25. 25.
    Hahn, S.: HTS pancake coils without turn-to-turn insulation. IEEE Trans Appl Supercond. 21, 1592–1595 (2011)ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of SciencesUniversity of Chinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

Personalised recommendations