Transient stability of large aluminum stabilized superconductors

S. Noguchi, Atsushi Ishiyama, T. Satow, N. Yanagi

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    Very large current composite superconductors have been considered and adopted to use in SMES coils and fusion applications, such as the Large Helical Device (LHD). These superconductors have large cross-sectional area of high purity aluminum stabilizer to improve their stability and to enhance the overall current density. Once a normal-zone is initiated in such a composite superconductor, the current transfers to the aluminum stabilizer according to the temperature distribution. The time constant of current diffusion in the stabilizer, however, is very long due to the low electrical resistivity of aluminum and the large conductor size. Therefore, an excess joule heat is generated in a small area near superconducting filaments and the temperature increases locally. In this paper, to evaluate this peculiar property we carry out some simulations with regard to quench process in the superconductor applied to the helical coil of LHD in National Institute for Fusion Science. The simulations by using a newly developed computer code are compared with the experimental results of the stability tests on the short samples of LHD conductor. Furthermore, we focus on the influence of the CuNi alloy clad adopted to the LHD conductor on the normal transition and normal-zone propagation properties.

    Original languageEnglish
    Pages (from-to)624-627
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume9
    Issue number2 PART 1
    DOIs
    Publication statusPublished - 1999

    Fingerprint

    Aluminum
    Superconducting materials
    aluminum
    conductors
    coils
    Fusion reactions
    fusion
    stability tests
    composite materials
    Composite materials
    time constant
    filaments
    purity
    Temperature distribution
    temperature distribution
    Current density
    simulation
    current density
    computer programs
    heat

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Physics and Astronomy (miscellaneous)

    Cite this

    Transient stability of large aluminum stabilized superconductors. / Noguchi, S.; Ishiyama, Atsushi; Satow, T.; Yanagi, N.

    In: IEEE Transactions on Applied Superconductivity, Vol. 9, No. 2 PART 1, 1999, p. 624-627.

    Research output: Contribution to journalArticle

    Noguchi, S. ; Ishiyama, Atsushi ; Satow, T. ; Yanagi, N. / Transient stability of large aluminum stabilized superconductors. In: IEEE Transactions on Applied Superconductivity. 1999 ; Vol. 9, No. 2 PART 1. pp. 624-627.
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