Thermal analysis of cryocooler-cooled Bi2223 pulsed coil

H. Miyazaki, S. Chigusa, I. Tanaka, M. Iwakuma, K. Funaki, H. Hayashi, A. Tomioka

Research output: Contribution to journalArticlepeer-review


We fabricated a cryocooler-cooled Bi2223 superconducting pulsed coil and experimentally studied thermal runaway in dc or ac operation. We carried out numerical simulation of thermal properties of the coil in order to explain thermal runaway of the coil. Firstly, we analyzed the total heat generation of flux-flow loss and ac loss inside the winding from the experimental results of the external field losses and the E-J characteristics for the Bi2223 strands. Secondly, we numerically simulated the thermal properties by using 2- dimensional heat conduction equation with axial symmetry. The numerical simulation shows the relation between the initiation of thermal runaway and the temperature distribution with highly concentrated heat source in the winding. We have a semi-quantitative agreement between the numerical results and the experimental ones for the condition of the thermal runaway.

Original languageEnglish
Article number257
Pages (from-to)1051-1054
Number of pages4
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - Jun 1 2006

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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