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

作者：Kim S B^*; Saitou A; Joo J H; Kadota T

来源：Physica C-Superconductivity and Its Applications, 2011, 471(21-22): 1428-1431.

DOI：10.1016/j.physc.2011.05.209

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

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 FITS 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.

• 出版日期2011-11