Numerical simulation of critical current performance in Nb 3Sn strand subjected to periodic bending deformation

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

    Research output: Contribution to journalArticle

    Abstract

    In the ITER Engineering Design Activity (EDA), four Nb 3Sn 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
    JournalIEEJ Transactions on Power and Energy
    Volume128
    Issue number6
    Publication statusPublished - 2008

    Fingerprint

    Critical currents
    Computer simulation
    Bronze
    Stiffness
    Degradation
    Networks (circuits)
    Experiments
    Temperature

    Keywords

    • Bending strain
    • CIC conductor
    • Critical current
    • Degradation
    • Nb Sn

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology

    Cite this

    Numerical simulation of critical current performance in Nb 3Sn strand subjected to periodic bending deformation. / Murakami, Haruyuki; Ueda, Hiroshi; Ishiyama, Atsushi; Koizumi, Norikiyo; Okuno, Kiyoshi.

    In: IEEJ Transactions on Power and Energy, Vol. 128, No. 6, 2008.

    Research output: Contribution to journalArticle

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    AU - Okuno, Kiyoshi

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