Effect of Crossover Turns in Double-Pancake Winding on Magnetic Field Homogeneity of HTS NMR Magnet

Geonwoo Baek, Jiho Lee, Woo Seung Lee, Yong Soo Yoon, Tae Kuk Ko

Research output: Contribution to journalArticlepeer-review


Field homogeneity of a superconducting magnet is a critical factor for nuclear magnetic resonance (NMR) spectrometers. For REBCO high-temperature superconducting (HTS) coil fabrication, layer-wound is considered a better option than double-pancake (DP) winding, in terms of field homogeneity. Nonetheless, DP winding is preferred to layer-wound owing to the ease of manufacturing and the difficulty in making long REBCO tapes. However, DP winding has an inevitable crossover turn between the top and bottom layers. For magnets with an HTS insert used in NMR spectrometers, the crossover turn could be critical for the field homogeneity. In this paper, the magnetic field generated by the crossover turn is derived based on the Biot-Savart law, and the effect of crossover turns in stacked DPs on the field homogeneity of an NMR-class HTS magnet is analyzed.

Original languageEnglish
Article number4300505
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - 2019 Aug

Bibliographical note

Funding Information:
Manuscript received October 29, 2018; accepted February 11, 2019. Date of publication February 19, 2019; date of current version March 21, 2019. This work was supported in part by “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry, and Energy, Republic of Korea, and in part by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) under Grants 20184030202270 and 2017R1A2B3012208. (Corresponding author: Tae Kuk Ko.) G. Baek and T. K. Ko are with the Department of Electrical and Electronic Engineering, School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail:,bgw03@naver.com; tkko@yonsei.ac.kr).

Publisher Copyright:
© 2002-2011 IEEE.

All Science Journal Classification (ASJC) codes

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


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