The normal-zone propagation properties of the non-insulated HTS coil in cryocooled operation

S. B. Kim, A. Saitou, J. H. Joo, T. Kadota

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


High temperature superconducting (HTS) coils wound with HTS wires have very low normal zone propagation velocity (NZPV) and complicated quench behaviors because the wires have a high thermal stability and large specific heat. According to these reasons, in case of HTS coils and magnets, it is difficult to expect the self-protection like low temperature superconducting (LTS) coils. In this paper, we suggest a method which can remove the insulation among turn-to-turn in the coil to improve the self-protection property of HTS coils. Because the thermal and electrical contacts along transverse direction are enhanced by no turn-to-turn insulation, the whole thermal stability of HTS coils begins to increase. Furthermore, although a quench occurs in the coil, it is possible to realize a self-protection of HTS coil because the current path of the coil is modified in order to avoid quenching. To confirm a quantitative evaluation for quench behavior of the suggested coil, we carried out the measurements with the coils having variety types of turn-to-turn insulation. The experimental results and the self-protection ability about the tested coils will be presented.

Original languageEnglish
Pages (from-to)1428-1431
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number21-22
Publication statusPublished - Nov 1 2011


  • Non-insulating HTS coil
  • Normal-zone propagation
  • Quench
  • Self-protection

ASJC Scopus subject areas

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


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