Visualization of normal-zone initiation and propagation using fluorescent paints

Atsushi Ishiyama, H. Murakami, M. Tsuchiya, H. Ueda, H. Kato, K. Nara, Y. Shiohara

    Research output: Contribution to journalArticle

    Abstract

    To establish a stability criterion for Yttrium barium copper oxide (YBCO)-coated conductors, it is necessary to clarify their transient thermal characteristics. Thermocouple thermometers, resistance thermometers, or the relation between the temperature and resistance of the stabilizer used for the conductors are generally employed for measuring their temperatures. However, these methods can only be employed to observe fixed-point data. Hence, it is difficult to observe the longitudinal and transversal distributions of temperatures in coated conductors. In this study, we adopt a method for the visualization of the temperature distribution of coated conductors by using fluorescent paints whose color changes with temperature. By adopting this method, we can measure the two-dimensional distribution of temperature in magnetic fields and at cryogenic temperatures. Therefore, local heat generation in the YBCO tapes can be observed with a higher spatial resolution and the uniformity in the critical current density of YBCO tapes can be identified. In this paper, we describe the developed thermal visualization system and the preliminary experimental results of the visualization of normal-zone initiation and propagation in YBCO sample strips. Further, we also report a part of the normal-zone initiation and propagation mechanism by electromagnetic field and heat transfer analyses by employing a three-dimensional finite element method (FEM).

    Original languageEnglish
    Article number012169
    JournalJournal of Physics: Conference Series
    Volume97
    Issue number1
    DOIs
    Publication statusPublished - 2008 Feb 1

    Fingerprint

    paints
    barium oxides
    copper oxides
    yttrium
    conductors
    propagation
    tapes
    temperature
    resistance thermometers
    heat generation
    thermometers
    cryogenic temperature
    thermocouples
    strip
    critical current
    finite element method
    electromagnetic fields
    temperature distribution
    spatial resolution
    heat transfer

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Visualization of normal-zone initiation and propagation using fluorescent paints. / Ishiyama, Atsushi; Murakami, H.; Tsuchiya, M.; Ueda, H.; Kato, H.; Nara, K.; Shiohara, Y.

    In: Journal of Physics: Conference Series, Vol. 97, No. 1, 012169, 01.02.2008.

    Research output: Contribution to journalArticle

    Ishiyama, Atsushi ; Murakami, H. ; Tsuchiya, M. ; Ueda, H. ; Kato, H. ; Nara, K. ; Shiohara, Y. / Visualization of normal-zone initiation and propagation using fluorescent paints. In: Journal of Physics: Conference Series. 2008 ; Vol. 97, No. 1.
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    AU - Tsuchiya, M.

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    AU - Kato, H.

    AU - Nara, K.

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