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 1

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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