A Long Charging Delay for a No-Insulation REBCO Layer-Wound Coil and Its Influence on Operation With Outer LTS Coils

Kyoko Yanagisawa, Seiya Iguchi, Yi Xu, Jing Li, Akiko T. Saito, Hideki Nakagome, Tomoaki Takao, Shinji Matsumoto, Mamoru Hamada, Yoshinori Yanagisawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

This paper presents a long charging delay for a no-insulation (NI) REBCO layer-wound (LW) coil and an electromagnetic-induced thermal runaway, resulting in damages on the coil. A small NI REBCO LW coil with a self-inductance of 1.62 mH showed a charging delay time constant of ∼3000 s at 4.2 K. The coil was installed in the cold bore of a low-temperature superconducting (LTS) magnet, and the LTS outer coil was charged. Although the circuit of the NI REBCO LW coil was opened, the induced current inside the coil screened the magnetic field generated by the outer coils. Eventually, the NI REBCO LW coil showed a thermal runaway during charging the outer coils. After the experiment, we found burnouts of the REBCO conductor near the electrodes and buckling of the conductor for all the layers of the winding. The present results point out the technical problem and the worst case for a NI REBCO LW coil, which must be considered.

Original languageEnglish
Article number7383240
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number4
DOIs
Publication statusPublished - 2016 Jun

Keywords

  • REBCO layer-wound coil
  • electromagnetic-induced thermal runaway
  • no-insulation

ASJC Scopus subject areas

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

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