Initiation of thermal runaway in a 1 T cryocooler-cooled oxide superconducting pulsed coil in AC operation

H. Miyazaki, S. Harada, Masataka Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

Research output: Contribution to journalConference article

Abstract

We experimentally studied thermal runaway in a Bi2223 pulsed coil cooled by a cryocooler. It was found the total heat generation of the coil in thermal runaway was remarkably lower than the cooling capacity of the cryocooler. We simulated the total heat generation of flux-flow loss and AC loss in the winding from the experimental results of the external field losses and the E-J characteristics for the Bi2223 strands in order to estimate the thermal runaway in AC operation. The simulation shows that the thermal runaway is induced by the flux-flow loss localized in both coil sides, which is enhanced with increasing the coil temperature.

Original languageEnglish
Pages (from-to)1397-1401
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume426-431
Issue numberII
DOIs
Publication statusPublished - Oct 6 2005
EventProceedings of the 17th Internatioanl Symposium on Superconductivity (ISS 2004) Advances in Superconductivity -
Duration: Nov 23 2004Nov 25 2004

All Science Journal Classification (ASJC) codes

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

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