Test and Analysis of Laboratory-Scale D-Shaped Co-Wound No-Insulation HTS Single Pancake Coil for TF Coil Application

Jung Tae Lee, Jeseok Bang, Geonyoung Kim, Jaemin Kim, Jeonghwan Park, Chaemin Im, Wonseok Jang, Hyun Wook Kim, Yunyeol Ryu, Haigun Lee, Sangjun Oh, Seungyong Hahn

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


No-insulation (NI) high temperature superconductor (HTS) toroidal field (TF) coil or its variations have been regarded as potential options for a compact, high magnetic field tokamak due to compactness in size and robustness in operational reliability. However, its real application still faces multiple challenges, e.g., limited experience in the design, construction, and operation of 'D-shaped' NI HTS coils for toroid magnets. Here we report, as the first attempt in Korea, fabrication, test, and analysis of a reduced size D-shaped NI HTS single pancake coil to explore the feasibility of NI HTS technology in TF coil. The D-shaped NI HTS coil is designed to be 1/20 of the Korea Superconducting Tokamak Advanced Research (KSTAR) TF coil in height. One of the three test coils is wound with single HTS tape, and the other two test coils are co-wound with double and triple tapes, respectively. Current charging/discharging tests and sudden discharge tests were conducted for each coil, and the results are analyzed by the well-known lumped circuit model of a typical NI HTS coil. The results show possible variations in the contact resistance during charging and sudden discharge within a coil.

Original languageEnglish
Article number4602605
JournalIEEE Transactions on Applied Superconductivity
Issue number6
Publication statusPublished - 2022 Sept 1

Bibliographical note

Publisher Copyright:
© 2022 IEEE.


  • Circuit simulation
  • HTS coils
  • contact resistance
  • fusion magnets
  • no-insulation coils

ASJC Scopus subject areas

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


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