Transient stability analysis taking into account hall effect for large aluminum stabilized superconductor

Nobuki Kawawada, So Noguchi, Hajime Igarashi, Atsushi Ishiyama, Nagato Yanagi, Shinsaku Imagawa

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Aluminum stabilized superconductors are used in accelerators, SMES, and fusion devices, such as the LHD helical coils. These superconductors have large-cross sectional area of high purity aluminum to improve their stability. However, one of the important properties of these superconductors is the transient stability, which is caused by a long duration of transport current transfer from the superconducting strands into the aluminum in a normal-state region. Once a normal zone is initiated in such superconductors, excess joule heat is generated in a small region of the aluminum stabilizer near the superconducting strands during the transport current diffusion time. It hence deteriorates the transient stability. Therefore, it is important to investigate the characteristics of the transient stability by numerical analysis. The latest experiments of the LHD helical coil conductor show an asymmetrical propagation of normal zone along the longitudinal direction of the conductor. The Hall current generation is clearly one of the causes of this phenomenon. The Hall current generation prevents the transport current from transferring between the superconducting strands and the aluminum stabilizer. It causes the asymmetrical transport current distribution, and affects the stability of the superconductor. In order to simulate the normal-zone propagation in the superconductor more preciously and to clarify the cause of the asymmetrical propagation, we have developed a 2D finite element analysis code taking account of the Hall effect and investigated the transient stability of large aluminum stabilized superconductors.

    Original languageEnglish
    Article number1643192
    Pages (from-to)1717-1720
    Number of pages4
    JournalIEEE Transactions on Applied Superconductivity
    Volume16
    Issue number2
    DOIs
    Publication statusPublished - 2006 Jun

    Fingerprint

    Hall effect
    Aluminum
    Superconducting materials
    aluminum
    strands
    Hall currents
    propagation
    causes
    coils
    conductors
    current distribution
    numerical analysis
    Particle accelerators
    Numerical analysis
    purity
    accelerators
    Fusion reactions
    fusion
    Finite element method
    heat

    Keywords

    • Aluminum stabilized superconductor
    • Hall effect
    • Normal-zone propagation velocity
    • Transient stability

    ASJC Scopus subject areas

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

    Cite this

    Transient stability analysis taking into account hall effect for large aluminum stabilized superconductor. / Kawawada, Nobuki; Noguchi, So; Igarashi, Hajime; Ishiyama, Atsushi; Yanagi, Nagato; Imagawa, Shinsaku.

    In: IEEE Transactions on Applied Superconductivity, Vol. 16, No. 2, 1643192, 06.2006, p. 1717-1720.

    Research output: Contribution to journalArticle

    Kawawada, Nobuki ; Noguchi, So ; Igarashi, Hajime ; Ishiyama, Atsushi ; Yanagi, Nagato ; Imagawa, Shinsaku. / Transient stability analysis taking into account hall effect for large aluminum stabilized superconductor. In: IEEE Transactions on Applied Superconductivity. 2006 ; Vol. 16, No. 2. pp. 1717-1720.
    @article{40063df2e6a4469dbb0e0d0d47819b80,
    title = "Transient stability analysis taking into account hall effect for large aluminum stabilized superconductor",
    abstract = "Aluminum stabilized superconductors are used in accelerators, SMES, and fusion devices, such as the LHD helical coils. These superconductors have large-cross sectional area of high purity aluminum to improve their stability. However, one of the important properties of these superconductors is the transient stability, which is caused by a long duration of transport current transfer from the superconducting strands into the aluminum in a normal-state region. Once a normal zone is initiated in such superconductors, excess joule heat is generated in a small region of the aluminum stabilizer near the superconducting strands during the transport current diffusion time. It hence deteriorates the transient stability. Therefore, it is important to investigate the characteristics of the transient stability by numerical analysis. The latest experiments of the LHD helical coil conductor show an asymmetrical propagation of normal zone along the longitudinal direction of the conductor. The Hall current generation is clearly one of the causes of this phenomenon. The Hall current generation prevents the transport current from transferring between the superconducting strands and the aluminum stabilizer. It causes the asymmetrical transport current distribution, and affects the stability of the superconductor. In order to simulate the normal-zone propagation in the superconductor more preciously and to clarify the cause of the asymmetrical propagation, we have developed a 2D finite element analysis code taking account of the Hall effect and investigated the transient stability of large aluminum stabilized superconductors.",
    keywords = "Aluminum stabilized superconductor, Hall effect, Normal-zone propagation velocity, Transient stability",
    author = "Nobuki Kawawada and So Noguchi and Hajime Igarashi and Atsushi Ishiyama and Nagato Yanagi and Shinsaku Imagawa",
    year = "2006",
    month = "6",
    doi = "10.1109/TASC.2006.871309",
    language = "English",
    volume = "16",
    pages = "1717--1720",
    journal = "IEEE Transactions on Applied Superconductivity",
    issn = "1051-8223",
    publisher = "Institute of Electrical and Electronics Engineers Inc.",
    number = "2",

    }

    TY - JOUR

    T1 - Transient stability analysis taking into account hall effect for large aluminum stabilized superconductor

    AU - Kawawada, Nobuki

    AU - Noguchi, So

    AU - Igarashi, Hajime

    AU - Ishiyama, Atsushi

    AU - Yanagi, Nagato

    AU - Imagawa, Shinsaku

    PY - 2006/6

    Y1 - 2006/6

    N2 - Aluminum stabilized superconductors are used in accelerators, SMES, and fusion devices, such as the LHD helical coils. These superconductors have large-cross sectional area of high purity aluminum to improve their stability. However, one of the important properties of these superconductors is the transient stability, which is caused by a long duration of transport current transfer from the superconducting strands into the aluminum in a normal-state region. Once a normal zone is initiated in such superconductors, excess joule heat is generated in a small region of the aluminum stabilizer near the superconducting strands during the transport current diffusion time. It hence deteriorates the transient stability. Therefore, it is important to investigate the characteristics of the transient stability by numerical analysis. The latest experiments of the LHD helical coil conductor show an asymmetrical propagation of normal zone along the longitudinal direction of the conductor. The Hall current generation is clearly one of the causes of this phenomenon. The Hall current generation prevents the transport current from transferring between the superconducting strands and the aluminum stabilizer. It causes the asymmetrical transport current distribution, and affects the stability of the superconductor. In order to simulate the normal-zone propagation in the superconductor more preciously and to clarify the cause of the asymmetrical propagation, we have developed a 2D finite element analysis code taking account of the Hall effect and investigated the transient stability of large aluminum stabilized superconductors.

    AB - Aluminum stabilized superconductors are used in accelerators, SMES, and fusion devices, such as the LHD helical coils. These superconductors have large-cross sectional area of high purity aluminum to improve their stability. However, one of the important properties of these superconductors is the transient stability, which is caused by a long duration of transport current transfer from the superconducting strands into the aluminum in a normal-state region. Once a normal zone is initiated in such superconductors, excess joule heat is generated in a small region of the aluminum stabilizer near the superconducting strands during the transport current diffusion time. It hence deteriorates the transient stability. Therefore, it is important to investigate the characteristics of the transient stability by numerical analysis. The latest experiments of the LHD helical coil conductor show an asymmetrical propagation of normal zone along the longitudinal direction of the conductor. The Hall current generation is clearly one of the causes of this phenomenon. The Hall current generation prevents the transport current from transferring between the superconducting strands and the aluminum stabilizer. It causes the asymmetrical transport current distribution, and affects the stability of the superconductor. In order to simulate the normal-zone propagation in the superconductor more preciously and to clarify the cause of the asymmetrical propagation, we have developed a 2D finite element analysis code taking account of the Hall effect and investigated the transient stability of large aluminum stabilized superconductors.

    KW - Aluminum stabilized superconductor

    KW - Hall effect

    KW - Normal-zone propagation velocity

    KW - Transient stability

    UR - http://www.scopus.com/inward/record.url?scp=33746622963&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=33746622963&partnerID=8YFLogxK

    U2 - 10.1109/TASC.2006.871309

    DO - 10.1109/TASC.2006.871309

    M3 - Article

    AN - SCOPUS:33746622963

    VL - 16

    SP - 1717

    EP - 1720

    JO - IEEE Transactions on Applied Superconductivity

    JF - IEEE Transactions on Applied Superconductivity

    SN - 1051-8223

    IS - 2

    M1 - 1643192

    ER -