Study on Normal Zone Characteristics in a REBCO Insert Coil Induced by Quenches in an LTS Outsert Coil

Y. Tsuchiya, S. Muto, H. Oguro, S. Awaji, K. Watanabe, H. Miyazaki, S. Hanai, S. Ioka, M. Daibo, Y. Iijima

Research output: Contribution to journalArticle

Abstract

In this paper, normal zone in a REBCO single-pancake coil induced by quenches in a low-temperature superconducting outsert coil is investigated in both experimental and numerical methods to discuss the quench protection of REBCO coils. The normal zone is experimentally clarified by measuring a partial voltage in the REBCO coil at temperatures from 30 K to 50 K during quenches of the outsert coil charging 5 T. Using practical fittings for the physical properties of the components of the REBCO coil in ranges of 0-5 T and 10-77 K, the numerical results have good agreement with the experimental results. The simulation reveals the heating distribution with initial temperatures from 10 K to 65 K, which indicates that the maximum temperature in a hot spot becomes higher for the lower initial temperature. Unexpectedly, the temperature distribution becomes rather homogeneous with an initial temperature of 65 K. It suggests that the hot spot at higher temperature has a lower risk of burning out. Finally, possible coil protections are discussed as the operation at the high temperature or the quench heater method to keep the REBCO coil at high temperature when a hot spot appears.

Original languageEnglish
Article number7440840
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number4
DOIs
Publication statusPublished - 2016 Jun

Keywords

  • Superconducting magnet
  • hot-spot
  • quench protection

ASJC Scopus subject areas

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

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    Tsuchiya, Y., Muto, S., Oguro, H., Awaji, S., Watanabe, K., Miyazaki, H., Hanai, S., Ioka, S., Daibo, M., & Iijima, Y. (2016). Study on Normal Zone Characteristics in a REBCO Insert Coil Induced by Quenches in an LTS Outsert Coil. IEEE Transactions on Applied Superconductivity, 26(4), [7440840]. https://doi.org/10.1109/TASC.2016.2540918