Numerical simulation of critical current performance in Nb3Sn strand subjected to periodic bending deformation

Haruyuki Murakami, Hiroshi Ueda, Atsushi Ishiyama, Norikiyo Koizumi, Kiyoshi Okuno

Research output: Contribution to journalArticlepeer-review

Abstract

In the ITER Engineering Design Activity (EDA), four Nb3Sn model coils were developed and successfully tested. However, it was revealed that the critical current of the conductor degraded with the increase of electromagnetic force. One of the explanations of this phenomenon is a strand bending caused by enormous electromagnetic force. The authors therefore developed a simulation code using the distributed circuit model to investigate dependency of the critical current performance on the periodic bending deformation. The simulation results were in good agreement with the experiments. The dependence of the critical current on the periodic transverse load, temperature, periodic load pitch, thickness of Ta barrier which prevents Cu stabilizer to be contaminated by Sn, twist pitch of the strand and RRR of the bronze matrix was investigated using the developed code. The results showed that the critical current degraded less with decreasing the pitch of the transverse load and increasing the Ta barrier thickness. It suggests that the shorter cabling pitch and the larger bending stiffness prevent the critical current degradation.

Original languageEnglish
Pages (from-to)6+853-859
JournalIEEJ Transactions on Power and Energy
Volume128
Issue number6
DOIs
Publication statusPublished - 2008

Keywords

  • Bending strain
  • CIC conductor
  • Critical current
  • Degradation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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