Preliminary Conceptual Design Study on HTS Toroidal Field Coil for Compact High Magnetic Field Tokamak

Jung Tae Lee, Seong Hyeon Park, Jeonghwan Park, Jaemin Kim, Young Gyun Kim, Hyun Wook Kim, Hyun Sung Noh, Haigun Lee, Sangjun Oh, Seungyong Hahn

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


By rapid development of high temperature superconductors (HTS), the HTS magnet has become an enabling technology for compact, high magnetic field tokamaks requiring larger current densities and higher magnetic fields where low temperature superconductors (LTS) have limitations. Thus, a preliminary conceptual design study on HTS magnet for toroidal field (TF) coil, a major component of compact and high field tokamak, is presented to investigate the possibility of the use of an HTS. General features relevant to a large-scale superconducting magnet are discussed such as electromagnetics, mechanical stress, protection, and cryogenics. Two types of HTS tapes are used to design TF coils for a tokamak that targets 9.2 T at its major radius 3.3 m: 1) Design A, using an HTS tape used in previous high field HTS magnets; and 2) Design B, using the same HTS tape with twice the performance. The results convey the possibility of HTS TF coil with currently available technology, but with the expense of a large amount of HTS tapes inferring that a reduction in the HTS tape cost is required. Improvement on the HTS TF coil design is needed using the unique characteristics of HTS. Hence, some of the challenges for HTS fusion magnet are addressed including performance degradation of conductors, quench detection and protection method, and joint for demountable TF coil.

Original languageEnglish
Article number9405438
JournalIEEE Transactions on Applied Superconductivity
Issue number5
Publication statusPublished - 2021 Aug

Bibliographical note

Funding Information:
Manuscript received December 1, 2020; revised January 28, 2021 and March 17, 2021; accepted March 23, 2021. Date of publication April 15, 2021; date of current version May 10, 2021. This work was supported in part by the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT) under Grant 2018R1A2B3009249 and in part by R and D program of “code No. CN2001” through the Korea institute of Fusion Energy (KFE) funded by the Government funds. (Corresponding author: Seungyong Hahn.) Jung Tae Lee, Seong Hyeon Park, Jeonghwan Park, Jaemin Kim, and Seungy-ong Hahn are with the Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Korea (e-mail:

Publisher Copyright:
© 2002-2011 IEEE.


  • critical current
  • high temperature superconductor
  • magnet design
  • tokamak
  • toroidal field coil

ASJC Scopus subject areas

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


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